K. Imai

activity

20072026

most citedMeasurements of elliptic and triangular flow in high-multiplicity

^{3}

+

Au collisions at

s_{_{N N}} = 200

GeV

170 citations · 393 across the 23 of their papers we have counts for

collaborators

26 papers

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 $+$ …

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

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.…

nucl-ex2025

Measurement of $Λ$ Polarization in the $π^{-} p \to K^{0} Λ$ Reaction at $p_{π^{-}} = 1.33$ GeV/ $c$ toward a New $Λ p$ Scattering Experiment

PARC E40 Collaboration, T. Sakao, K. Miwa +69

This paper presents high-precision experimental data of the polarization of the $Λ$ hyperon in the $π^{-} p \to K^{0} Λ$ reaction, measured in the angular range $0.6<\cos θ^{CM}_{K0…

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-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…

hep-ex2023★ 4 cited

Transverse single-spin asymmetry of charged hadrons at forward and backward rapidity in polarized $p$ + $p$ , $p$ +Al, and $p$ +Au collisions at $s_{N N} = 200$ GeV}

N. J. Abdulameer, U. Acharya, C. Aidala +319

Reported here are transverse single-spin asymmetries ( $A_{N}$ ) in the production of charged hadrons as a function of transverse momentum ( $p_{T}$ ) and Feynman- $x$ ( $x_{F}$ ) in polarize…

hep-ex2023

Transverse single-spin asymmetry of midrapidity $π^{0}$ and $η$ mesons in $p$ +Au and $p$ +Al collisions at $s_{_{N N}} =$ 200 GeV

N. J. Abdulameer, U. Acharya, C. Aidala +319

Presented are the first measurements of the transverse single-spin asymmetries ( $A_{N}$ ) for neutral pions and eta mesons in $p$ +Au and $p$ +Al collisions at $s_{_{N N}} = 200$ Ge…

nucl-ex2022★ 13 cited

Measurement of $ϕ$ -meson production in Cu $+$ Au at $s_{_{N N}} = 200$ GeV and U $+$ U at $s_{_{N N}} = 193$ GeV

N. J. Abdulameer, U. Acharya, C. Aidala +408

The PHENIX experiment reports systematic measurements at the Relativistic Heavy Ion Collider of $ϕ$ -meson production in asymmetric Cu $+$ Au collisions at $s_{_{N N}}$ =200 GeV…

hep-ex2022

Improving constraints on gluon spin-momentum correlations in transversely polarized protons via midrapidity open-heavy-flavor electrons in $p^{↑} + p$ collisions at $s = 200$ GeV

N. J. Abdulameer, U. Acharya, C. Aidala +321

Polarized proton-proton collisions provide leading-order access to gluons, presenting an opportunity to constrain gluon spin-momentum correlations within transversely polarized pro…

nucl-ex2022★ 20 cited

Nonprompt direct-photon production in Au $+$ Au collisions at $s_{_{N N}} = 200$ GeV

U. A. Acharya, A. Adare, C. Aidala +332

The measurement of the direct-photon spectrum from Au $+$ Au collisions at $s_{_{N N}} = 200$ GeV is presented by the PHENIX collaboration using the external-photon-conversion te…

nucl-ex2022★ 3 cited

Charm- and Bottom-Quark Production in Au $+$ Au Collisions at $s_{_{N N}}$ = 200 GeV

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +342

The invariant yield of electrons from open-heavy-flavor decays for $1 < p_{T} < 8$ GeV/ $c$ at midrapidity $∣ y ∣ < 0.35$ in Au $+$ Au collisions at $s_{_{N N}}$ = 200 GeV has been measur…

nucl-ex2022

Measurements of second-harmonic Fourier coefficients from azimuthal anisotropies in $p$ $+$ $p$ , $p$ $+$ Au, $d$ $+$ Au, and $^{3}$ He $+$ Au collisions at $s_{_{N N}} = 200$ GeV

N. J. Abdulameer, U. Acharya, A. Adare +389

Recently, the PHENIX Collaboration has published second- and third-harmonic Fourier coefficients $v_{2}$ and $v_{3}$ for midrapidity ( $∣ η ∣ < 0.35$ ) charged hadrons in 0\%--5\% central $p…

nucl-ex2022

Measurement of differential cross sections for $Σ^{+} p$ elastic scattering in the momentum range 0.44-0.80 GeV/c

PARC E40 Collaboration, T. Nanamura, K. Miwa +69

We performed a novel $Σ^{+} p$ scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 $Σ^{+} p$ elastic scattering events were identified from $4.9 \times…

nucl-ex2022★ 11 cited

Study of $ϕ$ -meson production in $p$ $+$ Al, $p$ $+$ Au, $d$ $+$ Au, and $^{3}$ He $+$ Au collisions at $s_{_{N N}} = 200$ GeV

U. Acharya, A. Adare, C. Aidala +367

Small nuclear collisions are mainly sensitive to cold-nuclear-matter effects; however, the collective behavior observed in these collisions shows a hint of hot-nuclear-matter effec…

hep-ex2022

Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at $s = 510$ GeV in $p + p$ Collisions

PHENIX Collaboration, N. J. Abdulameer, U. Acharya +358

We present measurements of the cross section and double-helicity asymmetry $A_{LL}$ of direct-photon production in $p + p$ collisions at $s = 510$ GeV. The measureme…

nucl-ex2022★ 2 cited

Measurement of $ψ (2 S)$ nuclear modification at backward and forward rapidity in $p$ $+$ $p$ , $p$ $+$ Al, and $p$ $+$ Au collisions at $s_{_{N N}} = 200$ GeV

U. A. Acharya, C. Aidala, Y. Akiba +313

Suppression of the $J / ψ$ nuclear-modification factor has been seen as a trademark signature of final-state effects in large collision systems for decades. In small systems, the nuc…

nucl-ex2021★ 2 cited

Precise measurement of differential cross sections of the Σ-p --> Λ n reaction in momentum range 470-650 MeV/c

PARC E40 Collaboration, K. Miwa, J. K. Ahn +69

The differential cross sections of the Σ-p --> Λ n reaction were measured accurately for the Σ- momentum (p_{Σ}) ranging from 470 to 650 MeV/c at the J-PARC Hadron Experimental Fac…

nucl-ex2021★ 1 cited

Measurement of the differential cross sections of the Sigma-p elastic scattering in momentum range of 470 to 850 MeV/c

PARC E40 Collaboration, K. Miwa, J. K. Ahn +69

A high statistics $Σ p$ scattering experiment has been performed at the J-PARC Hadron Experimental Facility. Data for momentum-tagged $Σ^{-}$ running in a liquid hydrogen target wer…

nucl-ex2018★ 55 cited

Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

H. Ekawa, K. Agari, J. K. Ahn +100

A double- $Λ$ hypernucleus, $_{ΛΛ} Be$ , was observed by the J-PARC E07 collaboration in nuclear emulsions tagged by the $(K^{-}, K^{+})$ reaction. This event was interprete…

nucl-ex2017★ 19 cited

First Determination of Level Structure of an $s d$ -Shell Hypernucleus, $_{Λ}^{19} F$

S. B. Yang, J. K. Ahn, Y. Akazawa +45

We report on the first observation of $γ$ rays emitted from an $s d$ -shell hypernucleus, $_{Λ}^{19} F$ . The energy spacing between the ground state doublet, $1/ 2^{+}$ and $3/ 2^{+}$ …

nucl-ex2015★ 69 cited

Centrality-dependent modification of jet-production rates in deuteron-gold collisions at $s_{N N}$ =200 GeV

A. Adare, C. Aidala, N. N. Ajitanand +481

Jet production rates are measured in $p$ $+$ $p$ and $d$ $+$ Au collisions at $s_{N N}$ =200 GeV recorded in 2008 with the PHENIX detector at the Relativistic Heavy Ion Collider.…

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

Transverse single-spin asymmetry of forward η mesons in p↑+p 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 sNN​​​=200~GeV

Measurement of Λ Polarization in the π−p→K0Λ Reaction at pπ−​=1.33 GeV/c toward a New Λp Scattering Experiment

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

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

Transverse single-spin asymmetry of charged hadrons at forward and backward rapidity in polarized p+p, p+Al, and p+Au collisions at sNN​​=200 GeV}

Transverse single-spin asymmetry of midrapidity π0 and η mesons in p+Au and p+Al collisions at sNN​​​= 200 GeV

Measurement of ϕ-meson production in Cu+Au at sNN​​​=200 GeV and U+U at sNN​​​=193 GeV

Improving constraints on gluon spin-momentum correlations in transversely polarized protons via midrapidity open-heavy-flavor electrons in p↑+p collisions at s​=200 GeV

Nonprompt direct-photon production in Au+Au collisions at sNN​​​=200 GeV

Charm- and Bottom-Quark Production in Au+Au Collisions at sNN​​​ = 200 GeV

Measurements of second-harmonic Fourier coefficients from azimuthal anisotropies in p+p, p+Au, d+Au, and 3He+Au collisions at sNN​​​=200 GeV

Measurement of differential cross sections for Σ+p elastic scattering in the momentum range 0.44-0.80 GeV/c

Study of ϕ-meson production in p+Al, p+Au, d+Au, and 3He+Au collisions at sNN​​​=200 GeV

Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at s​=510 GeV in p​+p​ Collisions

Measurement of ψ(2S) nuclear modification at backward and forward rapidity in p+p, p+Al, and p+Au collisions at sNN​​​=200 GeV

Precise measurement of differential cross sections of the Σ-p --> Λ n reaction in momentum range 470-650 MeV/c

Measurement of the differential cross sections of the Sigma-p elastic scattering in momentum range of 470 to 850 MeV/c

Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

First Determination of Level Structure of an sd-Shell Hypernucleus, Λ19​F

Centrality-dependent modification of jet-production rates in deuteron-gold 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

Transverse single-spin asymmetry of forward $η$ mesons in $p^{↑} + p$ 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

Measurement of $Λ$ Polarization in the $π^{-} p \to K^{0} Λ$ Reaction at $p_{π^{-}} = 1.33$ GeV/ $c$ toward a New $Λ p$ Scattering Experiment

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

Transverse single-spin asymmetry of charged hadrons at forward and backward rapidity in polarized $p$ + $p$ , $p$ +Al, and $p$ +Au collisions at $s_{N N} = 200$ GeV}

Transverse single-spin asymmetry of midrapidity $π^{0}$ and $η$ mesons in $p$ +Au and $p$ +Al collisions at $s_{_{N N}} =$ 200 GeV

Measurement of $ϕ$ -meson production in Cu $+$ Au at $s_{_{N N}} = 200$ GeV and U $+$ U at $s_{_{N N}} = 193$ GeV

Improving constraints on gluon spin-momentum correlations in transversely polarized protons via midrapidity open-heavy-flavor electrons in $p^{↑} + p$ collisions at $s = 200$ GeV

Nonprompt direct-photon production in Au $+$ Au collisions at $s_{_{N N}} = 200$ GeV

Charm- and Bottom-Quark Production in Au $+$ Au Collisions at $s_{_{N N}}$ = 200 GeV

Measurements of second-harmonic Fourier coefficients from azimuthal anisotropies in $p$ $+$ $p$ , $p$ $+$ Au, $d$ $+$ Au, and $^{3}$ He $+$ Au collisions at $s_{_{N N}} = 200$ GeV

Measurement of differential cross sections for $Σ^{+} p$ elastic scattering in the momentum range 0.44-0.80 GeV/c

Study of $ϕ$ -meson production in $p$ $+$ Al, $p$ $+$ Au, $d$ $+$ Au, and $^{3}$ He $+$ Au collisions at $s_{_{N N}} = 200$ GeV

Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at $s = 510$ GeV in $p + p$ Collisions

Measurement of $ψ (2 S)$ nuclear modification at backward and forward rapidity in $p$ $+$ $p$ , $p$ $+$ Al, and $p$ $+$ Au collisions at $s_{_{N N}} = 200$ GeV

First Determination of Level Structure of an $s d$ -Shell Hypernucleus, $_{Λ}^{19} F$

Centrality-dependent modification of jet-production rates in deuteron-gold collisions at $s_{N N}$ =200 GeV