Publications

Showing 23 results for Author: John G. Lajoie

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Jul, 2026

Journal

Measurements at forward rapidity of elliptic flow of charged hadrons and open-heavy-flavor muons in Au+Au collisions at √𝑠𝑁⁢𝑁=200GeV

We present the first forward-rapidity measurements of elliptic anisotropy of open-heavy-flavor muons at the Relativistic Heavy Ion Collider. The measurements are based on data samples of Au+Au collisions at √𝑠𝑁⁢𝑁=200GeV collected by the PHENIX experiment in 2014 and 2016 with integrated luminosity of 14.5nb−1. The measurements are performed in the pseudorapidity range 1.2
Jun, 2026

Journal

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

Utilizing the 2012 transversely polarized proton data from the Relativistic Heavy Ion Collider at Brookhaven National Laboratory, the forward 𝜂-meson transverse single-spin asymmetry (𝐴𝑁) was measured for 𝑝↑+𝑝 collisions at √𝑠 =200 GeV as a function of Feynman-x (𝑥𝐹) for 0.2
Jun, 2026

Journal

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

Recent measurements of 𝐽/𝜓 production as a function of event charged-particle multiplicity at the collision energies of both the Large Hadron Collider (LHC) and the Relativistic Heavy Ion Collider (RHIC) show enhanced 𝐽/𝜓 production yields with increasing multiplicity. One potential explanation for this type of dependence is multiparton interactions (MPI). We present the f…
Jun, 2026

Journal

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

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 (1.2
Jun, 2026

Journal

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

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 the midrapidity 𝜂/𝜋0 ratio at 510 GeV. The forward cross section is measured differentially in 𝜂-meson transverse momentum (𝑝𝑇) from 1.0 to 6.5 GeV/𝑐 for pseudorapidity 3.0
Sep, 2025

Journal

Measurement of charged hadron multiplicity in Au+Au collisions at √SNN = 200 GeV with the sPHENIX detector

The pseudorapidity distribution of charged hadrons produced in Au+Au collisions at a center-of-mass energy of √SNN = 200 GeV is measured using data collected by the sPHENIX detector. Charged hadron yields are extracted by counting cluster pairs in the inner and outer layers of the Intermediate Silicon Tracker, with corrections applied for detector acceptance, reconstructio…
Aug, 2025

Journal

Measurement of the transverse energy density in Au+Au collisions at √𝑠𝑁⁢𝑁=200GeV with the sPHENIX detector

This paper reports measurements of the transverse energy per unit pseudorapidity (𝑑⁢𝐸𝑇/𝑑⁢𝜂) produced in Au+Au collisions at √𝑠𝑁⁢𝑁=200GeV, performed with the sPHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The results cover the pseudorapidity range |𝜂|
Aug, 2025

Journal

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

We report the first measurement of the azimuthal anisotropy of 𝐽/𝜓 at forward rapidity (1.2
Aug, 2025

Journal

Measurement of inclusive jet cross section and substructure in 𝑝 +𝑝 collisions at √𝑠 =200 GeV

The jet cross section and jet-substructure observables in 𝑝 +𝑝 collisions at √𝑠 =200 GeV were measured by the PHENIX Collaboration at the Relativistic Heavy Ion Collider (RHIC). Jets are reconstructed from charged-particle tracks and electromagnetic-calorimeter clusters using the anti-𝑘𝑡 algorithm with a jet radius of 𝑅 =0.3 for jets with transverse momentum within 8.0
Feb, 2025

Journal

Design of the ECCE detector for the Electron Ion Collider

The EIC Comprehensive Chromodynamics Experiment (ECCE) detector has been designed to address the full scope of the proposed Electron Ion Collider (EIC) physics program as presented by the National Academy of Science and provide a deeper understanding of the quark–gluon structure of matter. To accomplish this, the ECCE detector offers nearly acceptance and energy coverage a…
Feb, 2025

Journal

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

The measurement of the direct-photon spectrum from Au+Au collisions at √sNN = 200 GeV is presented by the PHENIX Collaboration using the external-photon-conversion technique for 0%–93% central collisions in a transverse-momentum (pT ) range of 0.8–10 GeV/c. An excess of direct photons, above prompt-photon production from hard-scattering processes, is observed for pT < 6 Ge…
Feb, 2025

Journal

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

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 charged hadrons with transverse momenta in the range 4–12 GeV/𝑐 and 0.5–7 GeV/𝑐, respectively, have been measured by the PHENIX experiment in 2014 for Au+Au collisions at √𝑠𝑁⁢𝑁=200 GeV. Suppression is…

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Publications

Measurements at forward rapidity of elliptic flow of charged hadrons and open-heavy-flavor muons in Au+Au collisions at √𝑠𝑁⁢𝑁=200GeV

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

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

Low-mass vector-meson production at forward rapidity in p+p and Au + Au collisions at √sNN = 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

Measurement of charged hadron multiplicity in Au+Au collisions at √SNN = 200 GeV with the sPHENIX detector

Measurement of the transverse energy density in Au+Au collisions at √𝑠𝑁⁢𝑁=200GeV with the sPHENIX detector

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

Measurement of inclusive jet cross section and substructure in 𝑝 +𝑝 collisions at √𝑠 =200 GeV

Design of the ECCE detector for the Electron Ion Collider

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

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