STUDY OF THE ISOSPIN SYMMETRY-BREAKING IN THE LIGHT-QUARK SEA OF THE NUCLEON FROM THE DRELL-YAN PROCESS

被引：363

作者：

BALDIT, A

BARRIERE, C

CASTOR, J

CHAMBON, T

DEVAUX, A

ESPAGNON, B

FARGEIX, J

FORCE, P

LANDAUD, G

SATURNINI, P

VAZEILLE, F

SONDEREGGER, P

ABREU, MC

BORDALO, P

FERREIRA, R

LOURENCO, C

RAMOS, S

SILVA, S

VARELA, J

GERSCHEL, C

JOUAN, D

TARRAGO, X

CHAURAND, B

KLUBERG, L

ROMANA, A

GORODETZKY, P

LAZIC, D

MAZINI, R

RACCA, C

ALESSANDRO, B

CHIAVASSA, E

DELLACASA, G

GALLIO, M

GIUBELLINO, P

GUAITA, P

MARZARICHIESA, A

MASERA, M

MONTENO, M

MUSSO, A

RAMELLO, L

RICCATI, L

SCOMPARIN, E

VERCELLIN, E

BEDJIDIAN, M

CONTARDO, D

DESCROIX, E

DRAPIER, O

GROSSIORD, JY

GUICHARD, A

HAROUTUNIAN, R

机构：

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

[2] INST PHYS NUCL LYON, CNRS, IN2P3, F-91406 ORSAY, FRANCE

[3] ECOLE POLYTECH, PHYS NUCL HAUTES ENERGIES LAB, CNRS, IN2P3, F-91128 PALAISEAU, FRANCE

[4] INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE

[5] CTR RECH NUCL, CNRS, IN2P3, F-67037 STRASBOURG, FRANCE

[6] UNIV LOUIS PASTEUR, F-67037 STRASBOURG, FRANCE

[7] UNIV PARIS 11, F-91405 ORSAY, FRANCE

[8] UNIV CLERMONT FERRAND, F-63177 CLERMONT FERRAND, FRANCE

[9] INFN, I-10125 TURIN, ITALY

[10] UNIV TURIN, DIPARTIMENTO FIS SPERIMENTALE, I-10125 TURIN, ITALY

[11] UNIV TECN LISBOA, IST, LISBON, PORTUGAL

[12] INST POLITECN LISBOA, ISEL, LISBON, PORTUGAL

[13] UNIV LYON 1, F-69622 VILLEURBANNE, FRANCE

[14] UNIV LISBON, FCUL, LISBON, PORTUGAL

来源：

PHYSICS LETTERS B | 1994年 / 332卷 / 1-2期

关键词：

D O I：

10.1016/0370-2693(94)90884-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The ratio of cross-sections for muon pair production through the Drell-Yan process in p - p and p - d reactions has been measured at gamma almost-equal-to 0, with 450 GeV/c incident protons. The asymmetry A(DY) = sigma(pp)-sigma(pn)/sigma(pp)+sigma(pn) amounts to -0.09 +/- 0.02 +/- 0.025. The ratio uBAR/dBAR of the nucleon sea structure functions derived from this measurement amounts to 0.51 +/- 0.04 +/- 0.05 at x = 0.18 and suggests that isospin symmetry is broken in the light quark sea of the nucleon.

引用

页码：244 / 250

页数：7

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