7
Yasuo MIAKE, Univ. of Tsukuba
Antiproton/proton ratios
•(u,d) quark jets likely produce a leading proton than antiproton.
–Ratio decreases with pt.
•Gluon jets produce the same number of proton and antiproton with softer distribution.
–At high pt, most of antiproton from gluons, while proton from both valence quark and gluon fragmentation.
–If gluon jets lose more energy, then ratio behavior modified.
Proton ; (u,d)
quark jet
Antiproton ;
(u,d) quark jet + gluon jet