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

Authors
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 MALEK F MANDRY R PIZZI JR
Citation
A. Baldit et al., STUDY OF THE ISOSPIN SYMMETRY-BREAKING IN THE LIGHT-QUARK SEA OF THE NUCLEON FROM THE DRELL-YAN PROCESS, Physics letters. Section B, 332(1-2), 1994, pp. 244-250
Citations number
19
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
332
Issue
1-2
Year of publication
1994
Pages
244 - 250
Database
ISI
SICI code
0370-2693(1994)332:1-2<244:SOTISI>2.0.ZU;2-Z
Abstract
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 a lmost-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 d erived 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 s ea of the nucleon.