Apr 3 – 7, 2017
University of Birmingham
Europe/London timezone

Energy dependent forward $B \rightarrow J/\psi$ measurements in $p+p$ collisions at PHENIX

Apr 5, 2017, 9:18 AM
Small Lecture Theatre, Poynting Building

Small Lecture Theatre, Poynting Building

WG5) Physics with Heavy Flavours WG5 Physics with Heavy Flavours


Dr Marie BOER (Los Alamos National Laboratory)


Heavy quark measurements in hadronic collisions are useful tests of perturbative Quantum Chromodynamics (pQCD) calculations given their large mass ($m_{c,b}\gg\Lambda_{\mathrm{QCD}}$). These measurements can also probe the gluon distribution in protons at a relatively large $Q^2$. At RHIC energies, $b$-quark production is dominated by the leading order gluon-gluon fusion in contrast of the production mechanism at Tevatron and LHC which are dominated by next-to-leading order processes. Different kinematic region of the nucleon parton distribution function is also accessed by RHIC measurements.

PHENIX has measured the production of $B$-mesons through the $B \rightarrow J/\psi \rightarrow \mu^{+}\mu^{-}$ decays in $1.2 < |y| < 2.2$ rapidity at 200 and 510 GeV $p+p$ collisions, by the analysis of displaced vertex of muons with the Forward Silicon Vertex Detector (FVTX). These measurements can access $B$-mesons with $p_{\mathrm{T}} > 0$ allowing a direct measurement of $b\bar{b}$ total cross section. The PHENIX $p + p$ measurements will be presented in comparison to Tevatron and LHC results, providing a understanding of the energy dependent $B$ hadron production and the transition between LO to NLO dominant $b$-quark production.

Primary authors

Dr Marie BOER (Los Alamos National Laboratory) Xuan Li (Los Alamos National Lab)

Presentation materials