Measurement of charm and bottom production from semileptonic hadron decays in collisions at GeV

GeVでの陽子-陽子衝突におけるセミレプトニック崩壊を利用したチャームおよびボトム生成の測定

Aidala, C.*; 長谷川 勝一   ; 今井 憲一; 佐甲 博之   ; 佐藤 進  ; 谷田 聖   ; PHENIX Collaboration*; 他296名*

Aidala, C.*; Hasegawa, Shoichi; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 296 of others*

Measurements of the differential production of electrons from open-heavy-flavor hadrons with charm- and bottom-quark content in collisions at GeV are presented. The measurements proceed through displaced-vertex analyses of electron tracks from the semileptonic decay of charm and bottom hadrons using the PHENIX silicon-vertex detector. The relative contribution of electrons from bottom decays to inclusive heavy-flavor-electron production is found to be consistent with fixed-order-plus-next-to-leading-log perturbative-QCD calculations within experimental and theoretical uncertainties. These new measurements in collisions provide a precision baseline for comparable forthcoming measurements in AA collisions.