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. PagèsJ. P. Perroud, D. Rüegger, R. W. Rusack, V. Singh, G. R. Snow, G. Sozzi, L. Studer, M. T. Tran, A. Vacchi, G. Valenti

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11 Scopus citations

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, 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.).

Original languageEnglish (US)
Pages (from-to)201-206
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume452
Issue number1-2
DOIs
StatePublished - 1999

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