T. Niida

activity

20102026

Λ

hyperon polarization in nuclear collisions: evidence for the most vortical fluid

920 citations · 6.8k across the 204 of their papers we have counts for

collaborators

208 papers

nucl-ex2026

Experimental review on global polarization and spin alignment in heavy-ion collisions

Takafumi Niida

Polarization phenomena in heavy-ion collisions have attracted considerable interest since the first experimental observation of global spin polarization. Over the past few years, p…

nucl-ex2026

Elliptic flow of $π^{0}$ mesons in Cu $+$ Au collisions at $s_{_{N N}} = 200$ GeV and U $+$ U at $s_{_{N N}} = 193$ GeV

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +379

The second-order azimuthal anisotropy coefficients ( $v_{2}$ ) of neutral $π$ mesons ( $π^{0}$ ) have been measured as a function of the transverse momentum ( $p_{T}$ ) and centrality of Cu $+$ …

nucl-ex2026★ 2 cited

Probing Late-Stage Hadronic Interactions at High Baryon Density via $K^{* 0}$ Production in the RHIC Beam Energy Scan Program

STAR Collaboration, B. E. Aboona, J. Adam +360

A precision measurement of the $K^{* 0}$ meson yield is reported in Au+Au collisions at $s_{N N} = 7.7, 11.5, 14.6, 19.6,$ and $27 GeV$ using the high-statistic…

nucl-ex2025

Identified charged hadron production in Au+Au collisions at $s_{NN}$ = 54.4 GeV with the STAR detector

STAR Collaboration, B. E. Aboona, J. Adam +360

We present results on the production of $π^{\pm}$ , $K^{\pm}$ , $p$ , and $p ˉ$ in Au+Au collisions at $s_{NN}$ = 54.4~GeV using the STAR detector at RHIC, at midrap…

nucl-ex2025

Evidence of Spin-Interference Effects in Exclusive $J / ψ \to e^{+} e^{-}$ Photoproduction in Ultraperipheral Heavy-Ion Collisions

The STAR Collaboration

We report the first evidence of spin interference in exclusive $J / ψ \to e^{+} e^{-}$ photoproduction in ultraperipheral heavy-ion collisions at STAR at $s_{N N} = 200$ ~GeV. In Au+A…

physics.data-an2025

Efficiency correction of particle-averaged quantities

Masakiyo Kitazawa, ShinIchi Esumi, Takafumi Niida +1

We derive analytic formulas to reconstruct particle-averaged quantities from experimental results that suffer from the efficiency loss of particle measurements. These formulas are…

hep-ex2025

Study of Central Exclusive Production of $π^{+} π^{-}$ , $K^{+} K^{-}$ and $p p ˉ$ Pairs in Proton-Proton Collisions at $s = 510$ GeV with the STAR Detector at RHIC

STAR Collaboration, B. E. Aboona, J. Adam +378

We report on the first measurement of the Central Exclusive Production process in proton-proton collisions: $pp \to p h^{+} h^{-} p$ (where $h = π, K, p$ ) at the center-of-…

hep-ex2025

Transverse single-spin asymmetry of forward $η$ mesons in $p^{↑} + p$ collisions at $s = 200$ GeV

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +380

Utilizing the 2012 transversely polarized proton data from the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, the forward $η$ -meson transverse single-spin asymm…

hep-ex2025

Measurement of transverse polarization of $Λ$ and $Λ ˉ$ hyperons inside jets in $pp$ collisions at $s = 200$ GeV

STAR Collaboration, B. E. Aboona, J. Adam +363

A surprisingly large transverse polarization of $Λ$ hyperons in unpolarized hadron-nucleon/nucleus collisions has been observed for 50 years, and the origin of this polarization re…

nucl-ex2025★ 3 cited

Observation of charmonium sequential suppression in heavy-ion collisions at the Relativistic Heavy Ion Collider

STAR Collaboration, B. E. Aboona, J. Adam +370

We report measurements of charmonium sequential suppression in Ru+Ru and Zr+Zr collisions at $s_{NN}$ = 200 GeV with the STAR experiment at the Relativistic Heavy…

hep-ex2025

Cross sections of $η$ mesons in $p$ $+$ $p$ collisions at forward rapidity at $s = 500$ GeV and central rapidity at $s = 510$ GeV

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +497

We present the first measurements of the forward and midrapidity $η$ -meson cross sections from $p$ $+$ $p$ collisions at $s = 500$ and $510$ ~GeV, respectively. We also report th…

nucl-ex2025

Low-mass vector-meson production at forward rapidity in $p$ $+$ $p$ and Au $+$ Au collisions at $s_{_{N N}} = 200$ ~GeV

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +352

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured low-mass vector-meson ( $ω + ρ$ and $ϕ$ ) production through the dimuon decay channel at forward rapidity $(1.…

hep-ex2025★ 4 cited

Energy Independence of the Collins Asymmetry in $p^{↑} p$ Collisions

STAR Collaboration, B. E. Aboona, J. Adam +367

The STAR experiment reports new, high-precision measurements of the transverse single-spin asymmetries for $π^{\pm}$ within jets, namely the Collins asymmetries, from transversely…

nucl-ex2025

Measurement of inclusive $J / ψ$ production in Au+Au collisions at $s_{NN} = 54.4$ GeV at STAR

The STAR Collaboration

This article presents measurements of inclusive $J / ψ$ production at midrapidity ( $∣ y ∣ <$ 1.0) in Au+Au collisions at $s_{NN} = 54.4$ GeV with the STAR dete…

hep-ex2025★ 16 cited

Measuring spin correlation between quarks during QCD confinement

The STAR Collaboration

The vacuum is now understood to possess a rich and complex structure, characterized by fluctuating energy fields and a condensate of virtual quark-antiquark pairs. The spontaneous…

nucl-ex2025

Azimuthal anisotropy of direct photons in Au $+$ Au collisions at $s_{_{N N}} = 200$ GeV

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +322

The PHENIX experiment at the Relativistic Heavy Ion Collider measured the second Fourier component $v_{2}$ of the direct-photon azimuthal anisotropy at midrapidity in Au $+$ Au collisi…

nucl-ex2025★ 13 cited

Onset of Constituent Quark Number Scaling in Heavy-Ion Collisions at RHIC

STAR Collaboration, B. E. Aboona, J. Adam +355

Partonic collectivity is one of the necessary signatures for the formation of quark-gluon plasma in high-energy nuclear collisions. Number of constituent quarks (NCQ) scaling has b…

nucl-ex2025★ 2 cited

Measurement of Kaon Directed Flow in Au+Au Collisions in the High Baryon Density Region

STAR Collaboration, B. E. Aboona, J. Adam +360

Rapidity-odd directed flow $v_{1}$ measurements are presented for $K^{\pm}$ and $K_{S}^{0}$ in Au $+$ Au collisions at $s_{NN}$ = 3.0, 3.2, 3.5, and 3.9 GeV with the STAR exp…

nucl-ex2024

Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC

The STAR Collaboration

The correlation between the mean transverse momentum, $[p_{T}]$ , and the squared anisotropic flow, $v_{n}^{2}$ , on an event-by-event basis has been suggested to be influen…

nucl-ex2024★ 10 cited

Light Nuclei Femtoscopy and Baryon Interactions in 3 GeV Au+Au Collisions at RHIC

The STAR Collaboration

We report the measurements of proton-deuteron ( $p$ - $d$ ) and deuteron-deuteron ( $d$ - $d$ ) correlation functions in Au+Au collisions at $s_{NN}$ = 3 GeV using fixed-targ…

nucl-ex2024

Measurement of elliptic flow of J $/ ψ$ in $s_{_{N N}} = 200$ GeV Au $+$ Au collisions at forward rapidity

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +365

We report the first measurement of the azimuthal anisotropy of J $/ ψ$ at forward rapidity ( $1.2 < ∣ η ∣ < 2.2$ ) in Au $+$ Au collisions at $s_{_{N N}} = 200$ GeV at the Relativistic Hea…

hep-ex2024

Multiplicity dependent $J / ψ$ and $ψ (2 S)$ production at forward and backward rapidity in $p$ $+$ $p$ collisions at $s = 200$ GeV

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +298

The $J / ψ$ and $ψ (2 S)$ charmonium states, composed of $c c ˉ$ quark pairs and known since the 1970s, are widely believed to serve as ideal probes to test quantum chromodynamics i…

nucl-ex2024★ 3 cited

Tracking the baryon number with nuclear collisions

STAR Collaboration

Baryon quantum number is believed to be conserved since baryogenesis in the early Universe. While fractionally charged valence quarks are understood conventionally to each carry a…

nucl-ex2024★ 5 cited

Jet modification via $π^{0}$ -hadron correlations in Au $+$ Au collisions at $s_{_{N N}} = 200$ GeV

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +532

High-momentum two-particle correlations are a useful tool for studying jet-quenching effects in the quark-gluon plasma. Angular correlations between neutral-pion triggers and charg…

Experimental review on global polarization and spin alignment in heavy-ion collisions

Elliptic flow of π0 mesons in Cu+Au collisions at sNN​​​=200 GeV and U+U at sNN​​​=193 GeV

Probing Late-Stage Hadronic Interactions at High Baryon Density via K∗0 Production in the RHIC Beam Energy Scan Program

Identified charged hadron production in Au+Au collisions at sNN​​ = 54.4 GeV with the STAR detector

Evidence of Spin-Interference Effects in Exclusive J/ψ→e+e− Photoproduction in Ultraperipheral Heavy-Ion Collisions

Efficiency correction of particle-averaged quantities

Study of Central Exclusive Production of π+π−, K+K− and ppˉ​ Pairs in Proton-Proton Collisions at s​=510 GeV with the STAR Detector at RHIC

Transverse single-spin asymmetry of forward η mesons in p↑+p collisions at s​=200 GeV

Measurement of transverse polarization of Λ and Λˉ hyperons inside jets in pp collisions at s​=200 GeV

Observation of charmonium sequential suppression in heavy-ion collisions at the Relativistic Heavy Ion Collider

Cross sections of η mesons in p+p collisions at forward rapidity at s​=500 GeV and central rapidity at s​=510 GeV

Low-mass vector-meson production at forward rapidity in p+p and Au+Au collisions at sNN​​​=200~GeV

Energy Independence of the Collins Asymmetry in p↑p Collisions

Measurement of inclusive J/ψ production in Au+Au collisions at sNN​​=54.4 GeV at STAR

Measuring spin correlation between quarks during QCD confinement

Azimuthal anisotropy of direct photons in Au+Au collisions at sNN​​​=200 GeV

Onset of Constituent Quark Number Scaling in Heavy-Ion Collisions at RHIC

Measurement of Kaon Directed Flow in Au+Au Collisions in the High Baryon Density Region

Beam-energy dependence of correlations between mean transverse momentum and anisotropic flow of charged particles in Au+Au collisions at RHIC

Light Nuclei Femtoscopy and Baryon Interactions in 3 GeV Au+Au Collisions at RHIC

Measurement of elliptic flow of J/ψ in sNN​​​=200 GeV Au+Au collisions at forward rapidity

Multiplicity dependent J/ψ and ψ(2S) production at forward and backward rapidity in p+p collisions at s​=200 GeV

Tracking the baryon number with nuclear collisions

Jet modification via π0-hadron correlations in Au+Au collisions at sNN​​​=200 GeV

Elliptic flow of $π^{0}$ mesons in Cu $+$ Au collisions at $s_{_{N N}} = 200$ GeV and U $+$ U at $s_{_{N N}} = 193$ GeV

Probing Late-Stage Hadronic Interactions at High Baryon Density via $K^{* 0}$ Production in the RHIC Beam Energy Scan Program

Identified charged hadron production in Au+Au collisions at $s_{NN}$ = 54.4 GeV with the STAR detector

Evidence of Spin-Interference Effects in Exclusive $J / ψ \to e^{+} e^{-}$ Photoproduction in Ultraperipheral Heavy-Ion Collisions

Study of Central Exclusive Production of $π^{+} π^{-}$ , $K^{+} K^{-}$ and $p p ˉ$ Pairs in Proton-Proton Collisions at $s = 510$ GeV with the STAR Detector at RHIC

Transverse single-spin asymmetry of forward $η$ mesons in $p^{↑} + p$ collisions at $s = 200$ GeV

Measurement of transverse polarization of $Λ$ and $Λ ˉ$ hyperons inside jets in $pp$ collisions at $s = 200$ GeV

Cross sections of $η$ mesons in $p$ $+$ $p$ collisions at forward rapidity at $s = 500$ GeV and central rapidity at $s = 510$ GeV

Low-mass vector-meson production at forward rapidity in $p$ $+$ $p$ and Au $+$ Au collisions at $s_{_{N N}} = 200$ ~GeV

Energy Independence of the Collins Asymmetry in $p^{↑} p$ Collisions

Measurement of inclusive $J / ψ$ production in Au+Au collisions at $s_{NN} = 54.4$ GeV at STAR

Azimuthal anisotropy of direct photons in Au $+$ Au collisions at $s_{_{N N}} = 200$ GeV

Measurement of elliptic flow of J $/ ψ$ in $s_{_{N N}} = 200$ GeV Au $+$ Au collisions at forward rapidity

Multiplicity dependent $J / ψ$ and $ψ (2 S)$ production at forward and backward rapidity in $p$ $+$ $p$ collisions at $s = 200$ GeV

Jet modification via $π^{0}$ -hadron correlations in Au $+$ Au collisions at $s_{_{N N}} = 200$ GeV