Determination of αs and the gluon distribution using direct photon production in pp and pp collisions

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

doi:10.1016/0370-2693(93)91601-I

Determination of α_s and the gluon distribution using direct photon production in pp and pp collisions

G. Ballocchi, A. Bernasconi, R. E. Breedon, L. Camilleri, R. L. Cool, P. T. Cox, P. Cushman, L. Dick, E. C. Dukes, B. Gabioud, F. Gaille, P. Giacomelli, D. Hubbard, J. B. Jeanneret, C. Joseph, W. Kubischta, J. F. Loude, E. Malamud, C. Morel, P. ObersonO. E. Overseth, J. L. Pagès, J. P. Perroud, D. Rüegger, R. W. Rusack, V. Singh, G. R. Snow, G. Sozzi, D. Steiner, L. Studer, M. T. Tran, A. Vacchi, G. Valenti, M. Werlen

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

Direct photon cross sections obtained in pp 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(pp → 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 Λ (4) MS. This first measurement of Λ (4) MS using direct photon data yields a value Λ (4) MS = 235 ± 79 (stat.) ± 70 (syst.) MeV. The corresponding value of α_s expressed at M_Z² is α_s (M_Z²) = 0.112±0.006 (stat.)±0.005 (syst.)_-0.001^+0.009 (theor.). The gluon distribution in the proton for x > 0.2 is determined both from the pp and from the pp data, and the results agree with each other and with previous determinations using the same method.

Original language	English (US)
Pages (from-to)	250-256
Number of pages	7
Journal	Physics Letters B
Volume	317
Issue number	1-2
DOIs	https://doi.org/10.1016/0370-2693(93)91601-I
State	Published - Nov 4 1993

Bibliographical note

Funding Information:
We are pleased to acknowledge financial support from the "Fonds National Suisse de la Recherche Sci-entifique", the US National Science Foundation, and the US Department of Energy.

Publisher link

10.1016/0370-2693(93)91601-I

Find It

Find It at U of M Libraries

Cite this

Ballocchi, G., Bernasconi, A., Breedon, R. E., Camilleri, L., Cool, R. L., Cox, P. T., Cushman, P., Dick, L., Dukes, E. C., Gabioud, B., Gaille, F., Giacomelli, P., Hubbard, D., Jeanneret, J. B., Joseph, C., Kubischta, W., Loude, J. F., Malamud, E., Morel, C., ... Werlen, M. (1993). Determination of α_s and the gluon distribution using direct photon production in pp and pp collisions. Physics Letters B, 317(1-2), 250-256. https://doi.org/10.1016/0370-2693(93)91601-I

Ballocchi, G, Bernasconi, A, Breedon, RE, Camilleri, L, Cool, RL, Cox, PT, Cushman, P, Dick, L, Dukes, EC, Gabioud, B, Gaille, F, Giacomelli, P, Hubbard, D, Jeanneret, JB, Joseph, C, Kubischta, W, Loude, JF, Malamud, E, Morel, C, Oberson, P, Overseth, OE, Pagès, JL, Perroud, JP, Rüegger, D, Rusack, RW, Singh, V, Snow, GR, Sozzi, G, Steiner, D, Studer, L, Tran, MT, Vacchi, A, Valenti, G & Werlen, M 1993, 'Determination of α_s and the gluon distribution using direct photon production in pp and pp collisions', Physics Letters B, vol. 317, no. 1-2, pp. 250-256. https://doi.org/10.1016/0370-2693(93)91601-I

@article{d1ead5ddb4124b42b866d7fd5b20df74,

title = "Determination of αs and the gluon distribution using direct photon production in pp and pp collisions",

abstract = "Direct photon cross sections obtained in pp 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(pp → 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 Λ (4) MS. This first measurement of Λ (4) MS using direct photon data yields a value Λ (4) MS = 235 ± 79 (stat.) ± 70 (syst.) MeV. The corresponding value of αs expressed at MZ2 is αs (MZ2) = 0.112±0.006 (stat.)±0.005 (syst.)-0.001+0.009 (theor.). The gluon distribution in the proton for x > 0.2 is determined both from the pp and from the pp data, and the results agree with each other and with previous determinations using the same method.",

author = "G. Ballocchi and A. Bernasconi and Breedon, {R. E.} and L. Camilleri and Cool, {R. L.} and Cox, {P. T.} and P. Cushman and L. Dick and Dukes, {E. C.} and B. Gabioud and F. Gaille and P. Giacomelli and D. Hubbard and Jeanneret, {J. B.} and C. Joseph and W. Kubischta and Loude, {J. F.} and E. Malamud and C. Morel 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 D. Steiner and L. Studer and Tran, {M. T.} and A. Vacchi and G. Valenti and M. Werlen",

note = "Funding Information: We are pleased to acknowledge financial support from the {"}Fonds National Suisse de la Recherche Sci-entifique{"}, the US National Science Foundation, and the US Department of Energy.",

year = "1993",

month = nov,

day = "4",

doi = "10.1016/0370-2693(93)91601-I",

language = "English (US)",

volume = "317",

pages = "250--256",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - Determination of αs and the gluon distribution using direct photon production in pp and pp collisions

AU - Ballocchi, G.

AU - Bernasconi, A.

AU - Breedon, R. E.

AU - Camilleri, L.

AU - Cool, R. L.

AU - Cox, P. T.

AU - Cushman, P.

AU - Dick, L.

AU - Dukes, E. C.

AU - Gabioud, B.

AU - Gaille, F.

AU - Giacomelli, P.

AU - Hubbard, D.

AU - Jeanneret, J. B.

AU - Joseph, C.

AU - Kubischta, W.

AU - Loude, J. F.

AU - Malamud, E.

AU - Morel, 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 - Steiner, D.

AU - Studer, L.

AU - Tran, M. T.

AU - Vacchi, A.

AU - Valenti, G.

AU - Werlen, M.

N1 - Funding Information: We are pleased to acknowledge financial support from the "Fonds National Suisse de la Recherche Sci-entifique", the US National Science Foundation, and the US Department of Energy.

PY - 1993/11/4

Y1 - 1993/11/4

N2 - Direct photon cross sections obtained in pp 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(pp → 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 Λ (4) MS. This first measurement of Λ (4) MS using direct photon data yields a value Λ (4) MS = 235 ± 79 (stat.) ± 70 (syst.) MeV. The corresponding value of αs expressed at MZ2 is αs (MZ2) = 0.112±0.006 (stat.)±0.005 (syst.)-0.001+0.009 (theor.). The gluon distribution in the proton for x > 0.2 is determined both from the pp and from the pp data, and the results agree with each other and with previous determinations using the same method.

AB - Direct photon cross sections obtained in pp 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(pp → 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 Λ (4) MS. This first measurement of Λ (4) MS using direct photon data yields a value Λ (4) MS = 235 ± 79 (stat.) ± 70 (syst.) MeV. The corresponding value of αs expressed at MZ2 is αs (MZ2) = 0.112±0.006 (stat.)±0.005 (syst.)-0.001+0.009 (theor.). The gluon distribution in the proton for x > 0.2 is determined both from the pp and from the pp data, and the results agree with each other and with previous determinations using the same method.

UR - http://www.scopus.com/inward/record.url?scp=0010994125&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0010994125&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(93)91601-I

DO - 10.1016/0370-2693(93)91601-I

M3 - Article

AN - SCOPUS:0010994125

SN - 0370-2693

VL - 317

SP - 250

EP - 256

JO - Physics Letters B

JF - Physics Letters B

IS - 1-2

ER -