Design, construction, operation and performance of a Hadron Blind Detector for the PHENIX experiment

Anderson, William E.; Azmoun, B.; Cherlin, A.; Chi, C.Y.; Citron, Z. H.; Connors, M.; Dubey, A. K.; Durham, J. M.; Fraenkel, Z.; Hemmick, T. K.; Kamin, J.; Kozlov, A.; Lewis, B.; Makek, M.; Milov, A.; Naglis, M.; Pantuev, V.; Pisani, R. P.; Proissl, M.; Ravinovich, I.; Rolnick, S. D.; Sakaguchi, T.; Sharma, D.; Stoll, S. P.; Sun, J.; Tserruya, I.; Woody, C. L.

doi:10.1016/j.nima.2011.04.015

Cited by 96 publications

(78 citation statements)

References 24 publications

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“…This finding opens up new challenges that will have to be addressed from the experimental side. The upgrade of the PHENIX experiment with a hadron blind detector [62] and the upgrade of the STAR detector [63] for independently measuring the correlated D andD meson contributions appear mandatory to shed some further light on the present 'puzzles'.…”

Section: Discussionmentioning

confidence: 99%

“…This problem will have to be investigated closer by the experimental collaborations. Furthermore, the upgrade of the PHENIX experiment with a hadron blind detector [62] should provide decisive information on the origin of the low mass dileptons produced in the heavy-ion collisions at √ s = 200 GeV.…”

Section: E Predictions For Star and Comparison To Preliminary Datamentioning

confidence: 99%

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Analysis of dilepton production inAu+Aucollisions atsNN=200GeV within the parto

et al. 2012

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We address dilepton production in Au+Au collisions at √ sNN = 200 GeV by employing the parton-hadron-string dynamics (PHSD) off-shell transport approach. Within the PHSD one goes beyond the quasiparticle approximation by solving generalized transport equations on the basis of the off-shell Kadanoff-Baym equations for the Green's functions in the phase-space representation. The approach consistently describes the full evolution of a relativistic heavy-ion collision from the initial hard scatterings and string formation through the dynamical deconfinement phase transition to the quark-gluon plasma (QGP) as well as hadronization and to the subsequent interactions in the hadronic phase. With partons described in the PHSD by the dynamical quasiparticle model (DQPM) -matched to reproduce lattice QCD results in thermodynamic equilibrium -we calculate, in particular, the dilepton radiation from partonic interactions through the reactions qq → γ * , qq → γ * + g and qg → γ * q (qg → γ * q ) in the early stage of relativistic heavy-ion collisions. By comparing our results to the data from the PHENIX Collaboration, we study the relative importance of different dilepton production mechanisms and point out the regions in phase space where partonic channels are dominant. Furthermore, explicit predictions are presented for dileptons within the acceptance of the STAR detector system and compared to the preliminary data.

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Section: Discussionmentioning

confidence: 99%

Section: E Predictions For Star and Comparison To Preliminary Datamentioning

confidence: 99%

Analysis of dilepton production inAu+Aucollisions atsNN=200GeV within the parto

et al. 2012

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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 HBD [49] is a gas electron multiplier (GEM)-based Čerenkov detector. Located at ∼5 cm from the beam pipe with the windowless CF 4 radiator extending to ∼60 cm in the radial direction, it covered a pseudorapidity range of jηj < 0.45.…”

Section: Charged Pion Identificationmentioning

confidence: 99%

“…In order to randomize the association, the tracks in the sample were required to point to the reflected track projection with respect to the vertical plane passing through the beam line. The charge distribution of the HBD clusters randomly associated with the charged tracks in the sample exhibits the characteristic exponential decay of scintillation photons [49], ensuring that they are a good sample of tracks misidentified as pions.…”

Section: Helicity Asymmetriesmentioning

confidence: 99%

Charged-pion cross sections and double-helicity asymmetries in polarizedp+pcollisions ats=200 GeV
Adare¹,
Aidala²,
Ajitanand³
et al. 2015
Phys. Rev. D
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We present midrapidity charged-pion invariant cross sections, the ratio of the π − to π þ cross sections and the charge-separated double-spin asymmetries in polarized p þ p collisions at ffiffi ffi s p ¼ 200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of ∼0.03-0.16 and provide unique information on the sign of the gluon-helicity distribution.

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Design, construction, operation and performance of a Hadron Blind Detector for the PHENIX experiment

Cited by 96 publications

References 24 publications

Analysis of dilepton production inAu+Aucollisions atsNN=200GeV within the parto

Analysis of dilepton production inAu+Aucollisions atsNN=200GeV within the parto

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

Charged-pion cross sections and double-helicity asymmetries in polarizedp+pcollisions ats=200 GeV
Adare¹,
Aidala²,
Ajitanand³
et al. 2015
Phys. Rev. D
Self Cite
15
0
4
0
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Design, construction, operation and performance of a Hadron Blind Detector for the PHENIX experiment

Cited by 96 publications

References 24 publications

Analysis of dilepton production inAu+Aucollisions atsNN=200GeV within the parto

Analysis of dilepton production inAu+Aucollisions atsNN=200GeV within the parto

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

Charged-pion cross sections and double-helicity asymmetries in polarizedp+pcollisions ats=200 GeVAdare1, Aidala2, Ajitanand3 et al. 2015Phys. Rev. DSelf Cite15040View full textAdd to dashboardCite

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Charged-pion cross sections and double-helicity asymmetries in polarizedp+pcollisions ats=200 GeV
Adare¹,
Aidala²,
Ajitanand³
et al. 2015
Phys. Rev. D
Self Cite
15
0
4
0
View full text Add to dashboard Cite