Universal scaling of the pion, kaon and proton p T spectra in PbPb collisions at 2.76 TeV
With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentu...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Wang, Yanyun [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2018transfer abstract |
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| Schlagwörter: |
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| Umfang: |
15 |
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| Übergeordnetes Werk: |
Enthalten in: Historical (retrospective) cohort studies and other epidemiologic study designs in perinatal research - Klebanoff, Mark A. ELSEVIER, 2018, journal devoted to the experimental and theoretical study of the fundamental constituents of matter and their interactions, Amsterdam |
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| Übergeordnetes Werk: |
volume:976 ; year:2018 ; pages:46-60 ; extent:15 |
| Links: |
|---|
| DOI / URN: |
10.1016/j.nuclphysa.2018.05.003 |
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ELV043322212 |
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| 245 | 1 | 0 | |a Universal scaling of the pion, kaon and proton p T spectra in PbPb collisions at 2.76 TeV |
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| 520 | |a With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. | ||
| 520 | |a With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. | ||
| 650 | 7 | |a PbPb collisions |2 Elsevier | |
| 650 | 7 | |a Transverse momentum |2 Elsevier | |
| 650 | 7 | |a Universal scaling |2 Elsevier | |
| 650 | 7 | |a Colour string percolation |2 Elsevier | |
| 700 | 1 | |a Yang, Liwen |4 oth | |
| 700 | 1 | |a Du, Xiaoling |4 oth | |
| 700 | 1 | |a Liu, Na |4 oth | |
| 700 | 1 | |a Qiao, Liyun |4 oth | |
| 700 | 1 | |a Zhang, Wenchao |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n North-Holland Publ. Co |a Klebanoff, Mark A. ELSEVIER |t Historical (retrospective) cohort studies and other epidemiologic study designs in perinatal research |d 2018 |d journal devoted to the experimental and theoretical study of the fundamental constituents of matter and their interactions |g Amsterdam |w (DE-627)ELV000986615 |
| 773 | 1 | 8 | |g volume:976 |g year:2018 |g pages:46-60 |g extent:15 |
| 856 | 4 | 0 | |u https://doi.org/10.1016/j.nuclphysa.2018.05.003 |3 Volltext |
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10.1016/j.nuclphysa.2018.05.003 doi GBV00000000000251A.pica (DE-627)ELV043322212 (ELSEVIER)S0375-9474(18)30092-7 DE-627 ger DE-627 rakwb eng 530 DE-600 610 VZ 44.92 bkl Wang, Yanyun verfasserin aut Universal scaling of the pion, kaon and proton p T spectra in PbPb collisions at 2.76 TeV 2018transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. PbPb collisions Elsevier Transverse momentum Elsevier Universal scaling Elsevier Colour string percolation Elsevier Yang, Liwen oth Du, Xiaoling oth Liu, Na oth Qiao, Liyun oth Zhang, Wenchao oth Enthalten in North-Holland Publ. Co Klebanoff, Mark A. ELSEVIER Historical (retrospective) cohort studies and other epidemiologic study designs in perinatal research 2018 journal devoted to the experimental and theoretical study of the fundamental constituents of matter and their interactions Amsterdam (DE-627)ELV000986615 volume:976 year:2018 pages:46-60 extent:15 https://doi.org/10.1016/j.nuclphysa.2018.05.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.92 Gynäkologie VZ AR 976 2018 46-60 15 |
| spelling |
10.1016/j.nuclphysa.2018.05.003 doi GBV00000000000251A.pica (DE-627)ELV043322212 (ELSEVIER)S0375-9474(18)30092-7 DE-627 ger DE-627 rakwb eng 530 DE-600 610 VZ 44.92 bkl Wang, Yanyun verfasserin aut Universal scaling of the pion, kaon and proton p T spectra in PbPb collisions at 2.76 TeV 2018transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. PbPb collisions Elsevier Transverse momentum Elsevier Universal scaling Elsevier Colour string percolation Elsevier Yang, Liwen oth Du, Xiaoling oth Liu, Na oth Qiao, Liyun oth Zhang, Wenchao oth Enthalten in North-Holland Publ. Co Klebanoff, Mark A. ELSEVIER Historical (retrospective) cohort studies and other epidemiologic study designs in perinatal research 2018 journal devoted to the experimental and theoretical study of the fundamental constituents of matter and their interactions Amsterdam (DE-627)ELV000986615 volume:976 year:2018 pages:46-60 extent:15 https://doi.org/10.1016/j.nuclphysa.2018.05.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.92 Gynäkologie VZ AR 976 2018 46-60 15 |
| allfields_unstemmed |
10.1016/j.nuclphysa.2018.05.003 doi GBV00000000000251A.pica (DE-627)ELV043322212 (ELSEVIER)S0375-9474(18)30092-7 DE-627 ger DE-627 rakwb eng 530 DE-600 610 VZ 44.92 bkl Wang, Yanyun verfasserin aut Universal scaling of the pion, kaon and proton p T spectra in PbPb collisions at 2.76 TeV 2018transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. PbPb collisions Elsevier Transverse momentum Elsevier Universal scaling Elsevier Colour string percolation Elsevier Yang, Liwen oth Du, Xiaoling oth Liu, Na oth Qiao, Liyun oth Zhang, Wenchao oth Enthalten in North-Holland Publ. Co Klebanoff, Mark A. ELSEVIER Historical (retrospective) cohort studies and other epidemiologic study designs in perinatal research 2018 journal devoted to the experimental and theoretical study of the fundamental constituents of matter and their interactions Amsterdam (DE-627)ELV000986615 volume:976 year:2018 pages:46-60 extent:15 https://doi.org/10.1016/j.nuclphysa.2018.05.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.92 Gynäkologie VZ AR 976 2018 46-60 15 |
| allfieldsGer |
10.1016/j.nuclphysa.2018.05.003 doi GBV00000000000251A.pica (DE-627)ELV043322212 (ELSEVIER)S0375-9474(18)30092-7 DE-627 ger DE-627 rakwb eng 530 DE-600 610 VZ 44.92 bkl Wang, Yanyun verfasserin aut Universal scaling of the pion, kaon and proton p T spectra in PbPb collisions at 2.76 TeV 2018transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. PbPb collisions Elsevier Transverse momentum Elsevier Universal scaling Elsevier Colour string percolation Elsevier Yang, Liwen oth Du, Xiaoling oth Liu, Na oth Qiao, Liyun oth Zhang, Wenchao oth Enthalten in North-Holland Publ. Co Klebanoff, Mark A. ELSEVIER Historical (retrospective) cohort studies and other epidemiologic study designs in perinatal research 2018 journal devoted to the experimental and theoretical study of the fundamental constituents of matter and their interactions Amsterdam (DE-627)ELV000986615 volume:976 year:2018 pages:46-60 extent:15 https://doi.org/10.1016/j.nuclphysa.2018.05.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.92 Gynäkologie VZ AR 976 2018 46-60 15 |
| allfieldsSound |
10.1016/j.nuclphysa.2018.05.003 doi GBV00000000000251A.pica (DE-627)ELV043322212 (ELSEVIER)S0375-9474(18)30092-7 DE-627 ger DE-627 rakwb eng 530 DE-600 610 VZ 44.92 bkl Wang, Yanyun verfasserin aut Universal scaling of the pion, kaon and proton p T spectra in PbPb collisions at 2.76 TeV 2018transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. PbPb collisions Elsevier Transverse momentum Elsevier Universal scaling Elsevier Colour string percolation Elsevier Yang, Liwen oth Du, Xiaoling oth Liu, Na oth Qiao, Liyun oth Zhang, Wenchao oth Enthalten in North-Holland Publ. Co Klebanoff, Mark A. ELSEVIER Historical (retrospective) cohort studies and other epidemiologic study designs in perinatal research 2018 journal devoted to the experimental and theoretical study of the fundamental constituents of matter and their interactions Amsterdam (DE-627)ELV000986615 volume:976 year:2018 pages:46-60 extent:15 https://doi.org/10.1016/j.nuclphysa.2018.05.003 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 44.92 Gynäkologie VZ AR 976 2018 46-60 15 |
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Universal scaling of the pion, kaon and proton p T spectra in PbPb collisions at 2.76 TeV |
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With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. |
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With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. |
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With the experimental data collected by the ALICE collaboration in PbPb collisions at a center-of-mass energy per nucleon pair 2.76 TeV for six different centralities (0–5%, 5–10%, 10–20%, 20–40%, 40–60% and 60–80%), we investigate the scaling property of the pion, kaon and proton transverse momentum ( p T ) spectra at these centralities. We show that in the low p T region with p T ≤ 2.75 (3.10 and 2.35) GeV/c the pion (kaon and proton) spectra exhibit a scaling behaviour independent of the centrality of the collisions. This scaling behaviour arises when these spectra are presented in terms of a suitable variable, z = p T / K . The scaling parameter K is determined by the quality factor method and is parameterized by a 〈 N part 〉 b , where 〈 N part 〉 is the average value of the number of participating nucleons, a and b are free parameters, b characterizes the rate at which lnK changes with ln 〈 N part 〉 . The values of b for pions and kaons are consistent within uncertainties, while they are smaller than that for protons. In the high p T region, due to the suppression of the spectra, a violation of the proposed scaling is observed going from central to peripheral collisions. The more peripheral the collisions are, the more clearly violated the proposed scaling becomes. In the framework of the colour string percolation model, we argue that the pions, kaons and protons originate from the fragmentation of clusters which are formed by strings overlapping and the cluster's fragmentation functions are different for different hadrons. The scaling behaviour of the pion, kaon and proton spectra in the low p T region can be simultaneously explained by the colour string percolation model in a qualitative way. |
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