Ring imaging Cherenkov detector of PHENIX experiment at RHIC

Akiba, Y.; Begay, R.; Burward-Hoy, J. M.; Chappell, R.B.; Crook, D.W.; Ebisu, K.; Emery, M.S.; Ferriera, J.; Frawley, A. D.; Hamagaki, H.; Hara, Hiroshi; Hayano, R.; Hemmick, T. K.; Hibino, M.; Hutter, R.; Kennedy, M.; Kikuchi, Jun; Matsumoto, T.; Moscone, C.G.; Nagasaka, Y.; Nishimura, S.; Oyama, K.; Sakaguchi, T.; Salomone, S.; Shigaki, K.; Tanaka, Y.; Walker, James W.; Wintenberg, A.L.; Young, G. R.

doi:10.1016/s0168-9002(99)00319-8

Cited by 18 publications

(10 citation statements)

References 2 publications

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“…The RICH is the primary central-arm detector used for electron identification in PHENIX [34], and is located in the radial region of 2.5-4.1 m, just behind PC1. The RICH uses CO 2 as the gas radiator at atmospheric pressure, and has aČerenkov threshold of γ = 35.…”

Section: Central Arm Detectorsmentioning

confidence: 99%

Dielectron production in Au + Au collisions atsNN=200GeV

Adare¹,

Aidala²,

Ajitanand³

et al. 2016

Phys. Rev. C

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Section: Central Arm Detectorsmentioning

confidence: 99%

Dielectron production in Au + Au collisions atsNN=200GeV

Adare¹,

Aidala²,

Ajitanand³

et al. 2016

Phys. Rev. C

Self Cite

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“…Details about PHENIX detector subsystems can be found in Refs. [23][24][25][26][27][28][29][30][31]. The beam-beam counters (BBC) provide the measurement of collision time, collision vertex position along the beam axis, and the minimum-bias (MB) trigger information [24].…”

Section: Experiments Setupmentioning

confidence: 99%

Heavy-quark production and elliptic flow in Au + Au collisions atsNN=62.4GeV

Adare¹,

Aidala²,

Ajitanand³

et al. 2015

Phys. Rev. C

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We present measurements of electrons and positrons from the semileptonic decays of heavyflavor hadrons at midrapidity (|y| < 0.35) in Au+Au collisions at √ s N N = 62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1 < p e T < 5 GeV/c. The invariant yield per binary collision is slightly enhanced above the p+p reference in Au+Au 0%-20%, 20%-40% and 40%-60% centralities at a comparable level. At this low beam energy this may be a result of the interplay between initial-state Cronin effects, final-state flow, and energy loss in medium. The v2 of electrons from heavy-flavor decays is nonzero when averaged between 1.3 < p e T < 2.5 GeV/c for 0%-40% centrality collisions at √ s N N = 62.4 GeV. For 20%-40% centrality collisions, the v2 at √ s N N = 62.4 GeV is smaller than that for heavy flavor decays at √ s N N = 200 GeV. The v2 of the electrons from heavy-flavor decay at the lower beam energy is also smaller than v2 for pions. Both results indicate that the heavy-quarks interact with the medium formed in these collisions, but they may not be at the same level of thermalization with the medium as observed at √ s N N = 200 GeV.

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“…The Pad Chamber 3 (PC3) is used to match the DC track in the jet measurement. The Ring Čerenkov detector (RICH) [20] is used for particle identification (PID) of charged pions. The Beam-Beam Counters (BBC) [21] cover 3.1 < |η| < 3.9 and are located at ±144 cm from the interaction point along the beam line.…”

Section: Methodsmentioning

confidence: 99%

Longitudinal double helicity asymmetry $A_{LL}$ from direct photon, jet and charged pion production in polarized $\vec{p}+\vec{p}$ collisions

Ji¹

2021

Preprint

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Understanding the proton spin composition from the quarks and gluons spin polarization and their motion is important to test various kinds of sum rules and nonperturbative properties of hadrons. At the Relativistic Heavy Ion Collider (RHIC), we collide longitudinally polarized proton beams and measure the double helicity asymmetry A L L , which is an important physical quantity for extracting the polarized parton distribution functions (PDFs) of the proton. Direct photon, jet and charged pion production are good channels to probe the gluon spin polarization inside the proton, with the ability to probe also the sign of the gluon spin. Direct photon production is the theoretically "cleanest" channel, with little fragmentation contribution, but limited by statistics. On the other hand, jet and charged pion production have more statistics, but include more hard processes and hadronization effects. I will present the recent measurements of direct photon, jet and charged pion A L L s at PHENIX and show their complementary roles in extracting the gluon spin.

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Ring imaging Cherenkov detector of PHENIX experiment at RHIC

Cited by 18 publications

References 2 publications

Dielectron production in Au + Au collisions atsNN=200GeV

Dielectron production in Au + Au collisions atsNN=200GeV

Heavy-quark production and elliptic flow in Au + Au collisions atsNN=62.4GeV

Longitudinal double helicity asymmetry $A_{LL}$ from direct photon, jet and charged pion production in polarized $\vec{p}+\vec{p}$ collisions

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