Observation of anomalous scaling violation in muon pair production by 194 GeV/c $ π^{−} $-tungsten interactions
Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realisti...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Betev, B. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1985 |
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| Schlagwörter: |
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| Anmerkung: |
© Springer-Verlag 1985 |
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| Übergeordnetes Werk: |
Enthalten in: Zeitschrift für Physik - Springer-Verlag, 1979, 28(1985), 1 vom: März, Seite 15-22 |
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| Übergeordnetes Werk: |
volume:28 ; year:1985 ; number:1 ; month:03 ; pages:15-22 |
| Links: |
|---|
| DOI / URN: |
10.1007/BF01550244 |
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| Katalog-ID: |
OLC2091893315 |
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| 245 | 1 | 0 | |a Observation of anomalous scaling violation in muon pair production by 194 GeV/c $ π^{−} $-tungsten interactions |
| 264 | 1 | |c 1985 | |
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| 520 | |a Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section. | ||
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| 700 | 1 | |a Blaising, J. J. |4 aut | |
| 700 | 1 | |a Bordalo, P. |4 aut | |
| 700 | 1 | |a Boumediene, A. |4 aut | |
| 700 | 1 | |a Cerrito, L. |4 aut | |
| 700 | 1 | |a Degré, A. |4 aut | |
| 700 | 1 | |a Ereditato, A. |4 aut | |
| 700 | 1 | |a Falciano, S. |4 aut | |
| 700 | 1 | |a Freudenreich, K. |4 aut | |
| 700 | 1 | |a Gorini, E. |4 aut | |
| 700 | 1 | |a Guanziroli, M. |4 aut | |
| 700 | 1 | |a Hofer, H. |4 aut | |
| 700 | 1 | |a Juillot, P. |4 aut | |
| 700 | 1 | |a Kluberg, L. |4 aut | |
| 700 | 1 | |a Lecomte, P. |4 aut | |
| 700 | 1 | |a Le Coultre, P. |4 aut | |
| 700 | 1 | |a Morand, R. |4 aut | |
| 700 | 1 | |a Mours, B. |4 aut | |
| 700 | 1 | |a Romana, A. |4 aut | |
| 700 | 1 | |a Salmeron, R. |4 aut | |
| 700 | 1 | |a Strolin, P. |4 aut | |
| 700 | 1 | |a Suter, H. |4 aut | |
| 700 | 1 | |a Telegdi, V. L. |4 aut | |
| 700 | 1 | |a Varela, J. |4 aut | |
| 700 | 1 | |a Viertel, G. |4 aut | |
| 700 | 1 | |a Wallace-Hadrill, J. |4 aut | |
| 700 | 1 | |a Winter, M. |4 aut | |
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10.1007/BF01550244 doi (DE-627)OLC2091893315 (DE-He213)BF01550244-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Betev, B. verfasserin aut Observation of anomalous scaling violation in muon pair production by 194 GeV/c $ π^{−} $-tungsten interactions 1985 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1985 Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section. Tungsten Structure Function Pair Production Particle Acceleration External Input Blaising, J. J. aut Bordalo, P. aut Boumediene, A. aut Cerrito, L. aut Degré, A. aut Ereditato, A. aut Falciano, S. aut Freudenreich, K. aut Gorini, E. aut Guanziroli, M. aut Hofer, H. aut Juillot, P. aut Kluberg, L. aut Lecomte, P. aut Le Coultre, P. aut Morand, R. aut Mours, B. aut Romana, A. aut Salmeron, R. aut Strolin, P. aut Suter, H. aut Telegdi, V. L. aut Varela, J. aut Viertel, G. aut Wallace-Hadrill, J. aut Winter, M. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 28(1985), 1 vom: März, Seite 15-22 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:28 year:1985 number:1 month:03 pages:15-22 https://doi.org/10.1007/BF01550244 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 28 1985 1 03 15-22 |
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10.1007/BF01550244 doi (DE-627)OLC2091893315 (DE-He213)BF01550244-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Betev, B. verfasserin aut Observation of anomalous scaling violation in muon pair production by 194 GeV/c $ π^{−} $-tungsten interactions 1985 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1985 Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section. Tungsten Structure Function Pair Production Particle Acceleration External Input Blaising, J. J. aut Bordalo, P. aut Boumediene, A. aut Cerrito, L. aut Degré, A. aut Ereditato, A. aut Falciano, S. aut Freudenreich, K. aut Gorini, E. aut Guanziroli, M. aut Hofer, H. aut Juillot, P. aut Kluberg, L. aut Lecomte, P. aut Le Coultre, P. aut Morand, R. aut Mours, B. aut Romana, A. aut Salmeron, R. aut Strolin, P. aut Suter, H. aut Telegdi, V. L. aut Varela, J. aut Viertel, G. aut Wallace-Hadrill, J. aut Winter, M. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 28(1985), 1 vom: März, Seite 15-22 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:28 year:1985 number:1 month:03 pages:15-22 https://doi.org/10.1007/BF01550244 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 28 1985 1 03 15-22 |
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10.1007/BF01550244 doi (DE-627)OLC2091893315 (DE-He213)BF01550244-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Betev, B. verfasserin aut Observation of anomalous scaling violation in muon pair production by 194 GeV/c $ π^{−} $-tungsten interactions 1985 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1985 Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section. Tungsten Structure Function Pair Production Particle Acceleration External Input Blaising, J. J. aut Bordalo, P. aut Boumediene, A. aut Cerrito, L. aut Degré, A. aut Ereditato, A. aut Falciano, S. aut Freudenreich, K. aut Gorini, E. aut Guanziroli, M. aut Hofer, H. aut Juillot, P. aut Kluberg, L. aut Lecomte, P. aut Le Coultre, P. aut Morand, R. aut Mours, B. aut Romana, A. aut Salmeron, R. aut Strolin, P. aut Suter, H. aut Telegdi, V. L. aut Varela, J. aut Viertel, G. aut Wallace-Hadrill, J. aut Winter, M. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 28(1985), 1 vom: März, Seite 15-22 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:28 year:1985 number:1 month:03 pages:15-22 https://doi.org/10.1007/BF01550244 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 28 1985 1 03 15-22 |
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10.1007/BF01550244 doi (DE-627)OLC2091893315 (DE-He213)BF01550244-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Betev, B. verfasserin aut Observation of anomalous scaling violation in muon pair production by 194 GeV/c $ π^{−} $-tungsten interactions 1985 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1985 Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section. Tungsten Structure Function Pair Production Particle Acceleration External Input Blaising, J. J. aut Bordalo, P. aut Boumediene, A. aut Cerrito, L. aut Degré, A. aut Ereditato, A. aut Falciano, S. aut Freudenreich, K. aut Gorini, E. aut Guanziroli, M. aut Hofer, H. aut Juillot, P. aut Kluberg, L. aut Lecomte, P. aut Le Coultre, P. aut Morand, R. aut Mours, B. aut Romana, A. aut Salmeron, R. aut Strolin, P. aut Suter, H. aut Telegdi, V. L. aut Varela, J. aut Viertel, G. aut Wallace-Hadrill, J. aut Winter, M. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 28(1985), 1 vom: März, Seite 15-22 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:28 year:1985 number:1 month:03 pages:15-22 https://doi.org/10.1007/BF01550244 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 28 1985 1 03 15-22 |
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10.1007/BF01550244 doi (DE-627)OLC2091893315 (DE-He213)BF01550244-p DE-627 ger DE-627 rakwb eng 530 VZ 530 VZ Betev, B. verfasserin aut Observation of anomalous scaling violation in muon pair production by 194 GeV/c $ π^{−} $-tungsten interactions 1985 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag 1985 Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section. Tungsten Structure Function Pair Production Particle Acceleration External Input Blaising, J. J. aut Bordalo, P. aut Boumediene, A. aut Cerrito, L. aut Degré, A. aut Ereditato, A. aut Falciano, S. aut Freudenreich, K. aut Gorini, E. aut Guanziroli, M. aut Hofer, H. aut Juillot, P. aut Kluberg, L. aut Lecomte, P. aut Le Coultre, P. aut Morand, R. aut Mours, B. aut Romana, A. aut Salmeron, R. aut Strolin, P. aut Suter, H. aut Telegdi, V. L. aut Varela, J. aut Viertel, G. aut Wallace-Hadrill, J. aut Winter, M. aut Enthalten in Zeitschrift für Physik Springer-Verlag, 1979 28(1985), 1 vom: März, Seite 15-22 (DE-627)130618799 (DE-600)795252-1 (DE-576)016125487 0170-9739 nnns volume:28 year:1985 number:1 month:03 pages:15-22 https://doi.org/10.1007/BF01550244 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_40 GBV_ILN_70 GBV_ILN_130 GBV_ILN_267 GBV_ILN_2006 GBV_ILN_2012 GBV_ILN_2014 GBV_ILN_2018 GBV_ILN_2409 GBV_ILN_4012 GBV_ILN_4046 GBV_ILN_4082 GBV_ILN_4103 GBV_ILN_4126 GBV_ILN_4306 GBV_ILN_4310 GBV_ILN_4315 GBV_ILN_4319 GBV_ILN_4323 AR 28 1985 1 03 15-22 |
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Betev, B. @@aut@@ Blaising, J. J. @@aut@@ Bordalo, P. @@aut@@ Boumediene, A. @@aut@@ Cerrito, L. @@aut@@ Degré, A. @@aut@@ Ereditato, A. @@aut@@ Falciano, S. @@aut@@ Freudenreich, K. @@aut@@ Gorini, E. @@aut@@ Guanziroli, M. @@aut@@ Hofer, H. @@aut@@ Juillot, P. @@aut@@ Kluberg, L. @@aut@@ Lecomte, P. @@aut@@ Le Coultre, P. @@aut@@ Morand, R. @@aut@@ Mours, B. @@aut@@ Romana, A. @@aut@@ Salmeron, R. @@aut@@ Strolin, P. @@aut@@ Suter, H. @@aut@@ Telegdi, V. L. @@aut@@ Varela, J. @@aut@@ Viertel, G. @@aut@@ Wallace-Hadrill, J. @@aut@@ Winter, M. @@aut@@ |
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Betev, B. Blaising, J. J. Bordalo, P. Boumediene, A. Cerrito, L. Degré, A. Ereditato, A. Falciano, S. Freudenreich, K. Gorini, E. Guanziroli, M. Hofer, H. Juillot, P. Kluberg, L. Lecomte, P. Le Coultre, P. Morand, R. Mours, B. Romana, A. Salmeron, R. Strolin, P. Suter, H. Telegdi, V. L. Varela, J. Viertel, G. Wallace-Hadrill, J. Winter, M. |
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observation of anomalous scaling violation in muon pair production by 194 gev/c $ π^{−} $-tungsten interactions |
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Observation of anomalous scaling violation in muon pair production by 194 GeV/c $ π^{−} $-tungsten interactions |
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Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section. © Springer-Verlag 1985 |
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Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section. © Springer-Verlag 1985 |
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Abstract The differential cross-section for dimuon production by 194 GeV/c $ π^{−} $ onW, as measured by the NA10 Collaboration, is compared with theoretical models. The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. The dependence of the results on external inputs (nucleon and pion-sea structure functions) is analysed; it is shown that in the next-to-leading logarithm approximation the value 〈K〉=1.03±0.03 (stat.) can be obtained for the ratio experimental/theoretical cross-section. © Springer-Verlag 1985 |
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The wide kinematical range of the data, extending well above the ϒ resonances, provides the opportunity of a comparison with ‘realistic’ Drell-Yan models, i.e. with those allowing for scaling violation in the hadronic structure functions. The data in fact clearly indicate the failure of the ‘naïve’ Drell-Yan model, while the available ‘realistic’ versions (leading logarithm approximation and next-to-leading logarithm approximation in first order QCD), although giving a better description of the data, still disagree in thexF and$$\sqrt \tau $$ dependences of the cross-section at high dimuon masses. This disagreement is referred to here as ‘anomalous’ scaling violation. 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