DETERMINATION OF ALPHA(S) AND THE GLUON DISTRIBUTION USING DIRECT PHOTON PRODUCTION IN (P)OVER-BAR-P AND PP COLLISIONS

被引：25

作者：

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

PAGES, JL

PERROUD, JP

RUEGGER, D

RUSACK, RW

SINGH, V

SNOW, GR

SOZZI, G

STEINER, D

STUDER, L

TRAN, MT

VACCHI, A

VALENTI, G

WERLEN, M

机构：

[1] CERN,CH-1211 GENEVA 23,SWITZERLAND

[2] YALE UNIV,NEW HAVEN,CT 06511

[3] UNIV LAUSANNE,CH-1015 LAUSANNE,SWITZERLAND

[4] ROCKEFELLER UNIV,NEW YORK,NY 10021

来源：

PHYSICS LETTERS B | 1993年 / 317卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0370-2693(93)91601-I

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Direct photon cross sections obtained in ppBAR and pp collisions at square-root s = 24.3 GeV at the CERN SPS, are used in a next-to-leading order QCD analysis. From the cross-section difference sigma(ppBAR --> gammaX) - sigma(pp --> gammaX), and quark distributions measured in deep inelastic scattering, a determination of the strong coupling constant, alpha(s), is performed via a measurement of LAMBDA(4)/MS . This first measurement of LAMBDA(4)/MS using direct photon data yields a value LAMBDA(4)/MS = 235 +/- 79 (stat.) +/- 70 (syst.) MeV. The corresponding value of alpha(s) expressed at M(Z)2 is alpha(s) (M(Z)2) = 0.112 +/- 0.006 (stat.) +/- 0.005 (syst.) +0.009/-0.001 (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.

引用

页码：250 / 256

页数：7

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