Λ hyperon spin polarization and CP tests at BESIII

In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ -...
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Autor*in:	Adlarson P. [verfasserIn] Li C. [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2019

Übergeordnetes Werk:	In: EPJ Web of Conferences - EDP Sciences, 2010, 199, p 03009(2019)
Übergeordnetes Werk:	volume:199, p 03009 ; year:2019

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1051/epjconf/201919903009

Katalog-ID:	DOAJ071457852

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520			\|a In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. The obtained cross-section and effective form factor are σ = 119.0(53)stat(51)syst pb and \|G\| = 0.123(3)stat(3)syst, respectively.
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publishDate	2019
allfields	10.1051/epjconf/201919903009 doi (DE-627)DOAJ071457852 (DE-599)DOAJ00d76aac82674fb5af7b03c97b190d35 DE-627 ger DE-627 rakwb eng QC1-999 Adlarson P. verfasserin aut Λ hyperon spin polarization and CP tests at BESIII 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. The obtained cross-section and effective form factor are σ = 119.0(53)stat(51)syst pb and \|G\| = 0.123(3)stat(3)syst, respectively. Physics Li C. verfasserin aut In EPJ Web of Conferences EDP Sciences, 2010 199, p 03009(2019) (DE-627)647306611 (DE-600)2595425-8 2100014X nnns volume:199, p 03009 year:2019 https://doi.org/10.1051/epjconf/201919903009 kostenfrei https://doaj.org/article/00d76aac82674fb5af7b03c97b190d35 kostenfrei https://www.epj-conferences.org/articles/epjconf/pdf/2019/04/epjconf_meson2019_03009.pdf kostenfrei https://doaj.org/toc/2100-014X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 199, p 03009 2019
spelling	10.1051/epjconf/201919903009 doi (DE-627)DOAJ071457852 (DE-599)DOAJ00d76aac82674fb5af7b03c97b190d35 DE-627 ger DE-627 rakwb eng QC1-999 Adlarson P. verfasserin aut Λ hyperon spin polarization and CP tests at BESIII 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. The obtained cross-section and effective form factor are σ = 119.0(53)stat(51)syst pb and \|G\| = 0.123(3)stat(3)syst, respectively. Physics Li C. verfasserin aut In EPJ Web of Conferences EDP Sciences, 2010 199, p 03009(2019) (DE-627)647306611 (DE-600)2595425-8 2100014X nnns volume:199, p 03009 year:2019 https://doi.org/10.1051/epjconf/201919903009 kostenfrei https://doaj.org/article/00d76aac82674fb5af7b03c97b190d35 kostenfrei https://www.epj-conferences.org/articles/epjconf/pdf/2019/04/epjconf_meson2019_03009.pdf kostenfrei https://doaj.org/toc/2100-014X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 199, p 03009 2019
allfields_unstemmed	10.1051/epjconf/201919903009 doi (DE-627)DOAJ071457852 (DE-599)DOAJ00d76aac82674fb5af7b03c97b190d35 DE-627 ger DE-627 rakwb eng QC1-999 Adlarson P. verfasserin aut Λ hyperon spin polarization and CP tests at BESIII 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. The obtained cross-section and effective form factor are σ = 119.0(53)stat(51)syst pb and \|G\| = 0.123(3)stat(3)syst, respectively. Physics Li C. verfasserin aut In EPJ Web of Conferences EDP Sciences, 2010 199, p 03009(2019) (DE-627)647306611 (DE-600)2595425-8 2100014X nnns volume:199, p 03009 year:2019 https://doi.org/10.1051/epjconf/201919903009 kostenfrei https://doaj.org/article/00d76aac82674fb5af7b03c97b190d35 kostenfrei https://www.epj-conferences.org/articles/epjconf/pdf/2019/04/epjconf_meson2019_03009.pdf kostenfrei https://doaj.org/toc/2100-014X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 199, p 03009 2019
allfieldsGer	10.1051/epjconf/201919903009 doi (DE-627)DOAJ071457852 (DE-599)DOAJ00d76aac82674fb5af7b03c97b190d35 DE-627 ger DE-627 rakwb eng QC1-999 Adlarson P. verfasserin aut Λ hyperon spin polarization and CP tests at BESIII 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. The obtained cross-section and effective form factor are σ = 119.0(53)stat(51)syst pb and \|G\| = 0.123(3)stat(3)syst, respectively. Physics Li C. verfasserin aut In EPJ Web of Conferences EDP Sciences, 2010 199, p 03009(2019) (DE-627)647306611 (DE-600)2595425-8 2100014X nnns volume:199, p 03009 year:2019 https://doi.org/10.1051/epjconf/201919903009 kostenfrei https://doaj.org/article/00d76aac82674fb5af7b03c97b190d35 kostenfrei https://www.epj-conferences.org/articles/epjconf/pdf/2019/04/epjconf_meson2019_03009.pdf kostenfrei https://doaj.org/toc/2100-014X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 199, p 03009 2019
allfieldsSound	10.1051/epjconf/201919903009 doi (DE-627)DOAJ071457852 (DE-599)DOAJ00d76aac82674fb5af7b03c97b190d35 DE-627 ger DE-627 rakwb eng QC1-999 Adlarson P. verfasserin aut Λ hyperon spin polarization and CP tests at BESIII 2019 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. The obtained cross-section and effective form factor are σ = 119.0(53)stat(51)syst pb and \|G\| = 0.123(3)stat(3)syst, respectively. Physics Li C. verfasserin aut In EPJ Web of Conferences EDP Sciences, 2010 199, p 03009(2019) (DE-627)647306611 (DE-600)2595425-8 2100014X nnns volume:199, p 03009 year:2019 https://doi.org/10.1051/epjconf/201919903009 kostenfrei https://doaj.org/article/00d76aac82674fb5af7b03c97b190d35 kostenfrei https://www.epj-conferences.org/articles/epjconf/pdf/2019/04/epjconf_meson2019_03009.pdf kostenfrei https://doaj.org/toc/2100-014X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2005 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2055 GBV_ILN_2111 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 199, p 03009 2019
language	English
source	In EPJ Web of Conferences 199, p 03009(2019) volume:199, p 03009 year:2019
sourceStr	In EPJ Web of Conferences 199, p 03009(2019) volume:199, p 03009 year:2019
format_phy_str_mv	Article
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topic_facet	Physics
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container_title	EPJ Web of Conferences
authorswithroles_txt_mv	Adlarson P. @@aut@@ Li C. @@aut@@
publishDateDaySort_date	2019-01-01T00:00:00Z
hierarchy_top_id	647306611
id	DOAJ071457852
language_de	englisch
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Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. 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callnumber-first	Q - Science
author	Adlarson P.
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topic_title	QC1-999 Λ hyperon spin polarization and CP tests at BESIII
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title	Λ hyperon spin polarization and CP tests at BESIII
ctrlnum	(DE-627)DOAJ071457852 (DE-599)DOAJ00d76aac82674fb5af7b03c97b190d35
title_full	Λ hyperon spin polarization and CP tests at BESIII
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author_browse	Adlarson P. Li C.
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title_sort	λ hyperon spin polarization and cp tests at besiii
callnumber	QC1-999
title_auth	Λ hyperon spin polarization and CP tests at BESIII
abstract	In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. The obtained cross-section and effective form factor are σ = 119.0(53)stat(51)syst pb and \|G\| = 0.123(3)stat(3)syst, respectively.
abstractGer	In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. The obtained cross-section and effective form factor are σ = 119.0(53)stat(51)syst pb and \|G\| = 0.123(3)stat(3)syst, respectively.
abstract_unstemmed	In these proceedings two preliminary results from the BESIII collaboration on polarized Λ and Λ¯$\bar \Lambda$ are reported. Both results are first observations and concern the resonant and non-resonant processes e−e+→J/ψ→ΛΛ¯${e^ - }{e^ + } \to J/\psi \to \Lambda \bar \Lambda$ and e−e+→γ*→ΛΛ¯${e^ - }{e^ + } \to {\gamma ^\ast} \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$, respectively. For J/ψ→ΛΛ¯$J/\psi \to \Lambda \bar \Lambda$ the relative phase between the electric and magnetic form factors, ΔΦ, has for the first time been determined, ΔΦ=42.4(6)stat(5)syst°$\Delta \Phi = 42.4{(6)_{{\rm{stat}}}}(5)_{_{{\rm{syst}}}}^^\circ$. That ΔΦ≠0$\Delta \Phi \ne 0$ allows for a simultaneous measurement also of the asymmetry decay parameters Λ→pπ− (α−)$\Lambda \to p{\pi ^ - }\,({\alpha _ - })$, Λ¯→p¯π+ (α+)$\bar \Lambda \to \bar p{\pi ^ + }\,({\alpha _ + })$ and Λ¯→n¯π0 (α¯0)$\bar \Lambda \to \bar n{\pi ^0}\,({\bar \alpha _0})$. The measured value of α−=0.750±0.009±0.004${\alpha _ - } = 0.750 \pm 0.009 \pm 0.004$ differs by 17(3)% from the PDG value. The simultaneous measurement for the asymmetry parameters allows for the most precise test of CP violation conducted for Λ decays, ACP = −0.006(12)stat(7)syst. The reaction e−e+→ΛΛ¯${e^ - }{e^ + } \to \Lambda \bar \Lambda$ at s=2.396 GeV$\sqrt s = 2.396\,{\rm{GeV}}$ is the first complete measurement of the time-like electric (GE) and magnetic (GM) form factor of any baryon as also the ratio R = \|(GE/(GM)\| and ΔΦ have been determined: R = 0.96(14)(12) and ΔΦ=37(12)stat(6)stat°$\Delta \Phi = 37{(12)_{{\rm{stat}}}}(6)_{{\rm{stat}}}^\circ$. The obtained cross-section and effective form factor are σ = 119.0(53)stat(51)syst pb and \|G\| = 0.123(3)stat(3)syst, respectively.
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title_short	Λ hyperon spin polarization and CP tests at BESIII
url	https://doi.org/10.1051/epjconf/201919903009 https://doaj.org/article/00d76aac82674fb5af7b03c97b190d35 https://www.epj-conferences.org/articles/epjconf/pdf/2019/04/epjconf_meson2019_03009.pdf https://doaj.org/toc/2100-014X
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up_date	2024-07-03T20:22:54.598Z
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