STAR HardProbes PWG

[Brennan Schaefer <brs521 AT lehigh.edu>]

Dear HP+Quarkonia conveners and members,

Below is a proposed abstract for the Fall DNP meeting.  Of note, this abstract was essentially approved for an earlier conference.

Measurement of J/Psi multiplicity dependent production in p+p = sqrt{s} = 510 GeV

The investigation of quarkonium production allows for the study of the properties of strongly interacting matter, such as interactions with the quark-gluon plasma and nucleonic gluon content. While such probes are essential, a detailed description of the quarkonium production mechanism is not yet completely understood. Proposed explanatory mechanisms, including multi-parton interactions, string screening, and higher gluon radiation are discussed, as well as the guidance this measurement and related probes provide to model calculations. The diverge of models at high normalized multiplicity emphasizes the potential for improvement arising from extending the measurement range.

Herein we present measurements of J/Psi production in the dielectron channel in 510 GeV p+p collisions recorded by the STAR detector in 2017. Observables include transverse momentum and rapidity spectra, however the main aim of this study is measuring the dependence of self-normalised J/Psi yields with respect to charged particle multiplicity. The presented analysis utilizes the largest dielectron sample of quarkonia the STAR experiment has obtained from p+p collisions, therefore both increasing precision and extending the reach into higher multiplicity.

all the best,

b

--

Brennan Schaefer

Postdoctoral Research Associate

Physics Department

Lehigh University

Bethlehem, PA 18015, USA

402 Lewis Laboratory

tel: 610.758.5328