Accès ouvert
2020
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
Strange hadrons are an excellent probe for identifying the phase boundary and onset of deconfinement in the QCD phase diagram. The STAR Collaboration has performed precision measurements of the abundances and transverse-momentum distributions for 8 species of strange mesons and baryons, as …
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Accès ouvert
2019
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
The Λ (Λ[over ¯]) hyperon polarization along the beam direction has been measured in Au+Au collisions at sqrt[s_{NN}]=200 GeV, for the first time in heavy-ion collisions. The polarization dependence on the hyperons' emission angle relative to the elliptic flow plane exhibits a …
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Accès ouvert
2019
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
We report on the first measurements of $J/\ensuremath{\psi}$ production at very low transverse momentum (${p}_{T}<0.2\text{ }\text{ }\mathrm{GeV}/c$) in hadronic $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$ and $\mathrm{U}+\mathrm{U}$ collisions at $\sqrt{{s}_{NN}}=193\text{ }\text{ }\mathrm{GeV}$. Remarkably, the inferred nuclear modification factor of $J/\ensuremath{\psi}$ at midrapidity …
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Accès ouvert
2019
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
Quark interactions with topological gluon configurations can induce chirality imbalance and local parity violation in quantum chromodynamics. This can lead to electric charge separation along the strong magnetic field in relativistic heavy-ion collisions – the chiral magnetic effect (CME). We report measurements …
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Accès ouvert
2019
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
We present measurements of the differential cross sections of inclusive $J/\ensuremath{\psi}$ meson production as a function of transverse momentum (${p}_{T}^{J/\ensuremath{\psi}}$) using the ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${e}^{+}{e}^{\ensuremath{-}}$ decay channels in $\mathrm{proton}+\mathrm{proton}$ collisions at center-of-mass energies of 510 and 500 GeV, respectively, recorded by the …
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Accès ouvert
2019
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
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 …
us, pl, ru, in, jp, cn, cz, de, Égypte, hu
(code pays fourni par la source)
Accès ouvert
2019
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
The first (${v}_{1}^{\mathrm{fluc}}$), second (${v}_{2}$), and third (${v}_{3}$) harmonic coefficients of the azimuthal particle distribution at midrapidity are extracted for charged hadrons and studied as a function of transverse momentum (${p}_{T}$) and mean charged particle multiplicity density $⟨{N}_{\mathrm{ch}}⟩$ in $U+U$ ($\sqrt{{s}_{NN}}=193\text{ }\text{ …
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Accès ouvert
2019
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
We report new STAR measurements of the single-spin asymmetries ${A}_{L}$ for ${W}^{+}$ and ${W}^{\ensuremath{-}}$ bosons produced in polarized proton-proton collisions at $\sqrt{s}=510\text{ }\text{ }\mathrm{GeV}$ as a function of the decay-positron and decay-electron pseudorapidity. The data were obtained in 2013 and correspond to …
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Accès ouvert
2018
report
OpenAlex
STAR Collaboration, J. Adam, L. Adamczyk, J. R. Adams et autres
We report systematic measurements of dielectron ($e^{\pm}e^{\pm}$) invariant-mass $M_{ee}$ spectra at mid-rapidity in Au+Au collisions at $\sqrt{s_{NN}}$ = 27, 39, and 62.4 GeV taken with the STAR detector at the Relativistic Heavy Ion Collider. For all energies studied, a significant excess yield …
Accès ouvert
2018
erratum
OpenAlex
STAR Collaboration, Jeanine Adam, L. Adamczyk, J. R. Adams et autres
In this erratum we report changes on the $D^0$ $p_T$ spectra and nuclear modification factor ($R_{AA}$) in Au+Au collisions at $\sqrt{s_{_{\mathrm{NN}}}}$ = 200 GeV by fixing the errors in the efficiency and selection criteria that affected the Au+Au results. The p+p reference …
Accès ouvert
2018
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
We present a measurement of inclusive J / ψ production at mid-rapidity ( | y | < 1 ) in p + p collisions at a center-of-mass energy of s = 200 GeV with the STAR experiment at the Relativistic Heavy Ion …
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Accès ouvert
2018
article
OpenAlex
J. Adam, L. Adamczyk, J. R. Adams, J. K. Adkins et autres
The STAR Collaboration reports measurements of the longitudinal double-spin asymmetry, ${A}_{LL}$, for neutral pions produced at forward directions in polarized proton-proton collisions, at a center-of-mass energy of 510 GeV. Results are given for transverse momenta in the range $2<{p}_{T}<10\text{ }\text{ }\mathrm{GeV}/c$ within …
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