Quenching of heavy and light flavour jets: experimental overview
In these proceedings, recent experimental results on jet quenching are discussed, focusing on measurements shown at the Quark Matter 2019 conference.
nucl-ex↗
arXiv subjects
Barbara Trzeciak
Publications and source records attributed to Barbara Trzeciak.
Feasibility Studies for Single Transverse-Spin Asymmetry Measurements at a Fixed-Target Experiment Using the LHC Proton and Lead Beams (AFTER@LHC)
The measurement of Single Transverse-Spin Asymmetries, $A_N$, for various quarkonium states and Drell-Yan lepton pairs can shed light on the orbital angular momentum of quarks and gluons, a fundamental ingredient of the proton-spin puzzle. The AFTER@LHC proposal combines a unique kinematic coverage and large luminosities thanks to the Large Hadron Collider beams to deliver precise measurements, complementary to the knowledge provided by collider experiments such as at RHIC. In this paper, we report on sensitivity studies for $J/ψ$, $Υ$ and Drell-Yan $A_N$ done using the performance of LHCb-like or ALICE-like detectors, combined with polarised gaseous hydrogen and helium-3 targets. In particular, such analyses will provide us with new insights and knowledge about transverse-momentum-dependent parton distribution functions for quarks and gluons and on twist-3 collinear matrix elements in the proton and the neutron.
hep-ex↗
J/$ψ$ polarization measurements in p+p collisions at $\sqrt{s}$ = 200 and 500 GeV with the STAR experiment
In these proceedings, measurements of J/psi polarization in p+p collisions at 200 and 500 GeV via the dielectron decay channel at mid-rapidity with the STAR experiment are discussed. At 200 GeV the polarization parameter, $λ_θ$, related to the polar anisotropy is obtained in the helicity frame as a function of transverse momentum, 2 < $p_{T}$ < 6 GeV/c, and compared to different model predictions. A new J/psi polarization measurement at 500 GeV extends the previous analysis to a wide transverse momentum range of 5 < $p_{T}$ < 16 GeV/c. Also, the polarization parameter related to the azimuthal anisotropy, $λ_ϕ$, is extracted in addition to $λ_θ$, in two reference frames: the helicity and Collins-Soper frames. This allows for the frame invariant parameter calculation vs $p_{T}$ in these two frames.
hep-ex↗
J/$ψ$ and $ψ(2S)$ measurement in p+p collisions at $\sqrt{s} =$ 200 and 500 GeV with the STAR experiment
In this paper, results on the J/psi cross section and polarization measured via the dielectron decay channel at mid-rapidity in p+p collisions at 200 and 500 GeV in the STAR experiment are discussed. Also, first measurements of the J/psi production as a function of the charged-particle multiplicity density and of psi(2S) to J/psi ratio at 500 GeV are reported.
hep-ex↗
STAR's latest results on quarkonium production
In this proceedings, we report the latest results of J/psi and Upsilon production from the STAR experiment at RHIC, in different colliding systems and colliding energies. J/psi nuclear modification factors (R_{AA}) in Au+Au collisions at 200, 62.4 and 39 GeV and in U+U collisions at 193 GeV, Upsilon R_{AA} in d+Au and Au+Au collisions at 200 and in U+U collisions at 193 GeV are shown and compared to different theoretical models. We also present prospects of quarkonium measurements at STAR.
nucl-ex↗
The latest STAR results on quarkonium production
We report the latest results of J/psi, psi(2S) and Upsilon production in the dielectron decay channel at mid-rapidity, from the STAR experiment. We present J/psi cross section measurements in p+p collisions at 200 and 500 GeV, as well as the first measurement of the psi(2S) to J/psi ratio at 500 GeV. We also show J/psi and Upsilon production in heavy ion collisions: J/psi nuclear modification factors (R_{AA}) in Au+Au collisions at 200, 62.4 and 39 GeV and in U+U collisions at 193 GeV, Upsilon R_{AA} in d+Au, Au+Au and U+U collisions at 200, 200 and 193 GeV, respectively. The results are compared to different model calculations.
nucl-ex↗
J/$ψ$ measurements in the STAR experiment
In this paper, we present recent STAR J/$ψ$ results. J/$ψ$ nuclear modification factors ($R_{AA}$) in Au+Au collisions at $\sqrt{s_{NN}} =$ 200, 62.4 and 39 GeV and in U+U collisions at $\sqrt{s_{NN}} =$ 193 GeV are measured and compared to different theoretical calculations. We also report J/$ψ$ elliptic flow ($v_{2}$) results in Au+Au collisions at $\sqrt{s_{NN}} =$ 200 GeV and the first $ψ(2S)$ to J/$ψ$ ratio measurement in $p+p$ collisions at $\sqrt{s} =$ 500 GeV.
hep-ex↗
J/$ψ$ and $ψ(2S)$ measurement in $p$+$p$ collisions at $\sqrt{s} =$ 200 and 500 GeV in the STAR experiment
In this paper, results on the J/$ψ$ cross section and polarization measured via the dielectron decay channel at mid-rapidity in $p+p$ collisions at $\sqrt{s}$ = 200 and 500 GeV in the STAR experiment are discussed. The first measurement of $ψ(2S)$ to J/$ψ$ ratio at $\sqrt{s}$ = 500 GeV is also reported.
hep-ex↗
Heavy flavor production in the STAR experiment
In this paper, recent STAR heavy flavor measurements in proton-proton and heavy-ion collisions are highlighted. We report studies of open charm mesons, reconstructed directly from hadronic decay products, and studies of electrons from semi-leptonic decays of heavy flavor hadrons. We also present J/$ψ$ measurements via the di-electron decay channel at various collision systems and energies. In Au+Au collisions the energy dependence of J/$ψ$ production measured at $\sqrt{s_{NN}}$ = 39, 62.4 and 200 GeV is shown. Finally, prospects of heavy flavor measurements with the STAR detector upgrades are discussed.
nucl-ex↗
Quarkonia production in the STAR experiment
In this proceedings the recent STAR results of $J/ψ$ and $Υ$ production in $p+p$, $d$+Au and Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV at mid-rapidity are reported. $J/ψ$ $p_{T}$ spectra in $p+p$ and Au+Au collisions for both low and high $p_{T}$ are shown. $J/ψ$ nuclear modification factor ($R_{AA}$) in $d$+Au and Au+Au collisions and $Υ$ $R_{AA}$ in Au+Au collisions are reported. Also, $J/ψ$ polarization in $p+p$ collisions and $J/ψ$ $v_{2}$ for semi-central Au+Au collisions are presented.
hep-ex↗
J/$ψ$ polarization in p+p collisions at $\sqrt{s}$ = 200 GeV in STAR
In this paper, J/$ψ$ polarization at mid-rapidity in $p+p$ collisions at $\sqrt{s}$ = 200 GeV measured in the STAR experiment at RHIC is reported. J/$ψ$ production is analyzed via the dielectron decay channel. J/$ψ$ polarization is extracted from the decay angular distribution in the helicity frame. The J/$ψ$ polarization is measured at transverse momentum range (2 - 6) GeV/c and is found to be consistent with $NLO^+$ Color Singlet Model ($NLO^+$ CSM), Color Octet Model (COM) predictions and with no polarization within current uncertainties.
nucl-ex↗