A new determination of αs using direct photon production cross sections in pp and p̄p collisions at √s = 24.3 GeV

M. Werlen; G. Ballocchi; R. E. Breedon; L. Camilleri; C. Comtat; R. L. Cool; P. T. Cox; P. Cushman; L. Dick; E. C. Dukes; P. Giacomelli; D. Hubbard; J. B. Jeanneret; C. Joseph; W. Kubischta; C. Morel; M. C. Nguyen; P. Oberson; O. E. Overseth; J. L. Pagès; J. P. Perroud; D. Rüegger; R. W. Rusack; V. Singh; G. R. Snow; G. Sozzi; L. Studer; M. T. Tran; A. Vacchi; G. Valenti

doi:10.1016/S0370-2693(99)00251-8

A new determination of α_s using direct photon production cross sections in pp and p̄p collisions at √s = 24.3 GeV

M. Werlen, G. Ballocchi, R. E. Breedon, L. Camilleri, C. Comtat, R. L. Cool, P. T. Cox, P. Cushman, L. Dick, E. C. Dukes, P. Giacomelli, D. Hubbard, J. B. Jeanneret, C. Joseph, W. Kubischta, C. Morel, M. C. Nguyen, P. Oberson, O. E. Overseth, J. L. PagèsJ. P. Perroud, D. Rüegger, R. W. Rusack, V. Singh, G. R. Snow, G. Sozzi, L. Studer, M. T. Tran, A. Vacchi, G. Valenti

Physics and Astronomy (Twin Cities)

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Abstract

Direct photon production cross sections obtained in high statistics p̄p and pp collisions at √s = 24.3 GeV at the CERN SPS are used in a next-to-leading order QCD analysis. From the cross section difference σ(p̄p → γX) - σ(pp → γX) and quark distributions measured in deep inelastic scattering, a determination of the strong coupling constant, α_S, is performed via a measurement of A⁽⁴⁾_MS. This measurement yields a value A⁽⁴⁾_MS = 210 ± 22(stat.) ± 44(syst.)⁺¹⁰⁵_-36(theo.) MeV. The corresponding value of α_S expressed at M²_Z is α_S(M²_Z) = 0.1112 ± 0.0016(stat.) ± 0.0033(syst.)^+0.0077_-0.0034 (theo.).

Original language	English (US)
Pages (from-to)	201-206
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	452
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(99)00251-8
State	Published - 1999

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Werlen, M., Ballocchi, G., Breedon, R. E., Camilleri, L., Comtat, C., Cool, R. L., Cox, P. T., Cushman, P., Dick, L., Dukes, E. C., Giacomelli, P., Hubbard, D., Jeanneret, J. B., Joseph, C., Kubischta, W., Morel, C., Nguyen, M. C., Oberson, P., Overseth, O. E., ... Valenti, G. (1999). A new determination of α_s using direct photon production cross sections in pp and p̄p collisions at √s = 24.3 GeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 452(1-2), 201-206. https://doi.org/10.1016/S0370-2693(99)00251-8

Werlen, M, Ballocchi, G, Breedon, RE, Camilleri, L, Comtat, C, Cool, RL, Cox, PT, Cushman, P, Dick, L, Dukes, EC, Giacomelli, P, Hubbard, D, Jeanneret, JB, Joseph, C, Kubischta, W, Morel, C, Nguyen, MC, Oberson, P, Overseth, OE, Pagès, JL, Perroud, JP, Rüegger, D, Rusack, RW, Singh, V, Snow, GR, Sozzi, G, Studer, L, Tran, MT, Vacchi, A & Valenti, G 1999, 'A new determination of α_s using direct photon production cross sections in pp and p̄p collisions at √s = 24.3 GeV', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 452, no. 1-2, pp. 201-206. https://doi.org/10.1016/S0370-2693(99)00251-8

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title = "A new determination of αs using direct photon production cross sections in pp and {\=p}p collisions at √s = 24.3 GeV",

abstract = "Direct photon production cross sections obtained in high statistics {\=p}p and pp collisions at √s = 24.3 GeV at the CERN SPS are used in a next-to-leading order QCD analysis. From the cross section difference σ({\=p}p → γX) - σ(pp → γX) and quark distributions measured in deep inelastic scattering, a determination of the strong coupling constant, αS, is performed via a measurement of A(4)MS. This measurement yields a value A(4)MS = 210 ± 22(stat.) ± 44(syst.)+105-36(theo.) MeV. The corresponding value of αS expressed at M2Z is αS(M2Z) = 0.1112 ± 0.0016(stat.) ± 0.0033(syst.)+0.0077-0.0034 (theo.).",

author = "M. Werlen and G. Ballocchi and Breedon, {R. E.} and L. Camilleri and C. Comtat and Cool, {R. L.} and Cox, {P. T.} and P. Cushman and L. Dick and Dukes, {E. C.} and P. Giacomelli and D. Hubbard and Jeanneret, {J. B.} and C. Joseph and W. Kubischta and C. Morel and Nguyen, {M. C.} and P. Oberson and Overseth, {O. E.} and Pag{\`e}s, {J. L.} and Perroud, {J. P.} and D. R{\"u}egger and Rusack, {R. W.} and V. Singh and Snow, {G. R.} and G. Sozzi and L. Studer and Tran, {M. T.} and A. Vacchi and G. Valenti",

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T1 - A new determination of αs using direct photon production cross sections in pp and p̄p collisions at √s = 24.3 GeV

AU - Werlen, M.

AU - Ballocchi, G.

AU - Breedon, R. E.

AU - Camilleri, L.

AU - Comtat, C.

AU - Cool, R. L.

AU - Cox, P. T.

AU - Cushman, P.

AU - Dick, L.

AU - Dukes, E. C.

AU - Giacomelli, P.

AU - Hubbard, D.

AU - Jeanneret, J. B.

AU - Joseph, C.

AU - Kubischta, W.

AU - Morel, C.

AU - Nguyen, M. C.

AU - Oberson, P.

AU - Overseth, O. E.

AU - Pagès, J. L.

AU - Perroud, J. P.

AU - Rüegger, D.

AU - Rusack, R. W.

AU - Singh, V.

AU - Snow, G. R.

AU - Sozzi, G.

AU - Studer, L.

AU - Tran, M. T.

AU - Vacchi, A.

AU - Valenti, G.

PY - 1999

Y1 - 1999

N2 - Direct photon production cross sections obtained in high statistics p̄p and pp collisions at √s = 24.3 GeV at the CERN SPS are used in a next-to-leading order QCD analysis. From the cross section difference σ(p̄p → γX) - σ(pp → γX) and quark distributions measured in deep inelastic scattering, a determination of the strong coupling constant, αS, is performed via a measurement of A(4)MS. This measurement yields a value A(4)MS = 210 ± 22(stat.) ± 44(syst.)+105-36(theo.) MeV. The corresponding value of αS expressed at M2Z is αS(M2Z) = 0.1112 ± 0.0016(stat.) ± 0.0033(syst.)+0.0077-0.0034 (theo.).

AB - Direct photon production cross sections obtained in high statistics p̄p and pp collisions at √s = 24.3 GeV at the CERN SPS are used in a next-to-leading order QCD analysis. From the cross section difference σ(p̄p → γX) - σ(pp → γX) and quark distributions measured in deep inelastic scattering, a determination of the strong coupling constant, αS, is performed via a measurement of A(4)MS. This measurement yields a value A(4)MS = 210 ± 22(stat.) ± 44(syst.)+105-36(theo.) MeV. The corresponding value of αS expressed at M2Z is αS(M2Z) = 0.1112 ± 0.0016(stat.) ± 0.0033(syst.)+0.0077-0.0034 (theo.).

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EP - 206

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -

A new determination of α_s using direct photon production cross sections in pp and p̄p collisions at √s = 24.3 GeV

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