Abstract
J/ψ suppression has long been considered a sensitive signature of the formation of the Quark-Gluon Plasma (QGP) in relativistic heavy-ion collisions. In this letter, we present the first measurement of inclusive J/ψ production at mid-rapidity through the dimuon decay channel in Au+Au collisions at sNN=200 GeV with the STAR experiment. These measurements became possible after the installation of the Muon Telescope Detector was completed in 2014. The J/ψ yields are measured in a wide transverse momentum (pT) range of 0.15 GeV/c to 12 GeV/c from central to peripheral collisions. They extend the kinematic reach of previous measurements at RHIC with improved precision. In the 0-10% most central collisions, the J/ψ yield is suppressed by a factor of approximately 3 for pT>5 GeV/c relative to that in p+p collisions scaled by the number of binary nucleon-nucleon collisions. The J/ψ nuclear modification factor displays little dependence on pT in all centrality bins. Model calculations can qualitatively describe the data, providing further evidence for the color-screening effect experienced by J/ψ mesons in the QGP.
Highlights
Among the primary goals of high-energy heavy-ion physics are the creation of the Quark-Gluon Plasma (QGP) and the study of its properties [1,2,3,4]
We present the first measurement of i√ncsNluNsi=ve20J0/ψGepVrowdiuthctitohne at mid-rapidity through the dimuon decay channel in STAR experiment
Strong suppression of the J /ψ meson with respect to its yield in p+p collisions scaled by the number of binary nucleon-nucleon collisions has been observed at high transverse momenta in central heavy-ion collisions at both Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies [6,7,8,9,10,11,12,13]
Summary
Among the primary goals of high-energy heavy-ion physics are the creation of the Quark-Gluon Plasma (QGP) and the study of its properties [1,2,3,4]. In the local coordinate frame of the MTD module where the associated hit resides, the y and z directions correspond to the azimuthal and beam directions in the global coordinate frame, respectively Differences in both y and z directions, i.e. y and z, are required to be less than 2(2.5)σ y, z for tracks with pT < (≥) 3 GeV/c, where σ y, z stand for the pT-dependent y and z resolutions. Since muons reach the MTD faster than background hadrons, the time of flight (ttof) of a particle measured by the MTD with respect to the start time provided by the VPD should be within 0.75 ns of the expected flight time extracted from the track propagation, i.e. ttof < 0.75 ns.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
