Speaker
Wenda Guo
(Central China Normal University)
Description
Measurements of the fraction of non-prompt ${\rm J/\psi}$, which is originated from beauty hadron, as a function of charged particle pseudorapidity density ${\rm d}N_{ch}/{\rm d}\eta$ in pp collisions at $\sqrt{s}$ = 13 TeV with ALICE at the LHC are reported. The ${\rm J/\psi}$ meson yield is measured at midrapidity (|y| < 0.9) via dielectron channel, for events selected based on the charged-particle multiplicity at midrapidity (|$\eta$| < 1) and at forward rapidity (−3.7 < $\eta$ < −1.7 and 2.8 < $\eta$ < 5.1); both observables are normalized to their corresponding averages in minimum bias events.
The separation between prompt and non-prompt ${\rm J/\psi}$ is performed down to $p_{\rm T}$ = 1 GeV/c, using the likelihood fit method through the templated MC shape describing non-prompt ${\rm J/\psi}$ decay length distribution.
The increase of the relative normalized inclusive ${\rm J/\psi}$ yield with relative normalized ${\rm d}N_{ch}/{\rm d}\eta$ is significantly stronger than linear and dependent on the transverse momentum. While, the fraction of non-prompt ${\rm J/\psi}$ don’t have a significant dependence vs mulitplicity. The data are compared to theoretical predictions in the inclusive case, which describe the observed trends well.
| Topics | Heavy Flavour Physics |
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Primary author
Wenda Guo
(Central China Normal University)
