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Report No.

$$B$$-meson production at forward and backward rapidity in $$p+p$$ and Cu + Au collisions at $$sqrt{s_{_{NN}}}$$ = 200 GeV

Aidala, C.*; Hasegawa, Shoichi  ; Imai, Kenichi; Sako, Hiroyuki  ; Sato, Susumu ; Tanida, Kiyoshi  ; PHENIX Collaboration*; 456 of others*

The fraction of $$J/psi$$ mesons which come from B-meson decay, $$textrm{F}_{B{rightarrow}J/psi}$$, is measured for J/$$psi$$ rapidity $$1.2<|y|< 2.2$$ and $$p_T>0$$ in $$p$$+$$p$$ and Cu+Au collisions at $$sqrt{s_{_{NN}}}$$=200 GeV with the PHENIX detector. The extracted fraction is $$textrm{F}_{B{rightarrow}J/psi}$$ = 0.025 $$pm$$ 0.006(stat) $$pm$$ 0.010(syst) for $$p$$+$$p$$ collisions. For Cu+Au collisions, $$textrm{F}_{B{rightarrow}J/psi}$$ is 0.094 $$pm$$ 0.028(stat) $$pm$$ 0.037(syst) in the Au-going direction ($$-2.2<y<-1.2$$) and 0.089 $$pm$$ 0.026(stat) $$pm$$ 0.040(syst) in the Cu-going direction ($$1.2<y<2.2$$). The nuclear modification factor, $$R_{rm CuAu}$$, of B mesons in Cu+Au collisions is consistent with binary scaling of measured yields in $$p$$+$$p$$ at both forward and backward rapidity.



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Category:Physics, Nuclear



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