Jet-like correlations with direct-photon and neutral-pion triggers at sNN=200 GeV

STAR Collaboration

doi:10.1016/j.physletb.2016.07.046

Jet-like correlations with direct-photon and neutral-pion triggers at s_NN=200 GeV

STAR Collaboration

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

Azimuthal correlations of charged hadrons with direct-photon (γ_dir) and neutral-pion (π⁰) trigger particles are analyzed in central Au+Au and minimum-bias p+p collisions at s_NN=200 GeV in the STAR experiment. The charged-hadron per-trigger yields at mid-rapidity from central Au+Au collisions are compared with p+p collisions to quantify the suppression in Au+Au collisions. The suppression of the away-side associated-particle yields per γ_dir trigger is independent of the transverse momentum of the trigger particle (p_T^trig), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons (p_T^assoc). Within uncertainty, similar levels of suppression are observed for γ_dir and π⁰ triggers as a function of z_T (≡p_T^assoc/p_T^trig). The results are compared with energy-loss-inspired theoretical model predictions. Our studies support previous conclusions that the lost energy reappears predominantly at low transverse momentum, regardless of the trigger energy.

Original language	English
Pages (from-to)	689-696
Number of pages	8
Journal	Physics Letters B
Volume	760
DOIs	https://doi.org/10.1016/j.physletb.2016.07.046
State	Published - Sep 10 2016
Externally published	Yes

Funding

We thank X. N. Wang and G.-Y Qin for providing their model predictions and helpful discussion. We thank the RHIC Operations Group and RCF at BNL , the NERSC Center at LBNL , the KISTI Center in Korea, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science, the U.S. NSF , the Ministry of Education and Science of the Russian Federation , NSFC , CAS , MOST and MOE of China, the National Research Foundation of Korea , NCKU (Taiwan), GA and MSMT of the Czech Republic, FIAS of Germany, DAE , DST , and UGC of India, the National Science Centre of Poland , National Research Foundation , the Ministry of Science, Education and Sports of the Republic of Croatia, and RosAtom of Russia.

Funders	Funder number
RosAtom of Russia
National Science Foundation	1352081, 1206009, 1505716
National Science Foundation
Office of Science
Nuclear Physics
National Research Foundation
Department of Science and Technology, Ministry of Science and Technology, India
University Grants Commission
Department of Atomic Energy, Government of India
National Natural Science Foundation of China
Ministerstvo Školství, Mládeže a Tělovýchovy
Ministry of Education of the People's Republic of China
Chinese Academy of Sciences
Ministarstvo Obrazovanja, Znanosti i Sporta
Ministry of Education and Science of the Russian Federation
National Research Foundation of Korea
Narodowe Centrum Nauki
Ministry of Science and Technology, Taiwan
National Cheng Kung University Hospital

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10.1016/j.physletb.2016.07.046

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@article{0eeeeaf2fcfd48fb8ce79eeb7fd4ff41,

title = "Jet-like correlations with direct-photon and neutral-pion triggers at sNN=200 GeV",

abstract = "Azimuthal correlations of charged hadrons with direct-photon (γdir) and neutral-pion (π0) trigger particles are analyzed in central Au+Au and minimum-bias p+p collisions at sNN=200 GeV in the STAR experiment. The charged-hadron per-trigger yields at mid-rapidity from central Au+Au collisions are compared with p+p collisions to quantify the suppression in Au+Au collisions. The suppression of the away-side associated-particle yields per γdir trigger is independent of the transverse momentum of the trigger particle (pTtrig), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons (pTassoc). Within uncertainty, similar levels of suppression are observed for γdir and π0 triggers as a function of zT (≡pTassoc/pTtrig). The results are compared with energy-loss-inspired theoretical model predictions. Our studies support previous conclusions that the lost energy reappears predominantly at low transverse momentum, regardless of the trigger energy.",

author = "{STAR Collaboration} and L. Adamczyk and Adkins, {J. K.} and G. Agakishiev and Aggarwal, {M. M.} and Z. Ahammed and I. Alekseev and Anderson, {D. M.} and A. Aparin and D. Arkhipkin and Aschenauer, {E. C.} and Ashraf, {M. U.} and A. Attri and Averichev, {G. S.} and X. Bai and V. Bairathi and R. Bellwied and A. Bhasin and Bhati, {A. K.} and P. Bhattarai and J. Bielcik and J. Bielcikova and Bland, {L. C.} and Bordyuzhin, {I. G.} and J. Bouchet and Brandenburg, {J. D.} and Brandin, {A. V.} and I. Bunzarov and J. Butterworth and H. Caines and {Calder{\'o}n de la Barca S{\'a}nchez}, M. and Campbell, {J. M.} and D. Cebra and I. Chakaberia and P. Chaloupka and Z. Chang and A. Chatterjee and S. Chattopadhyay and X. Chen and Chen, {J. H.} and J. Cheng and M. Cherney and W. Christie and G. Contin and Crawford, {H. J.} and S. Das and {De Silva}, {L. C.} and Debbe, {R. R.} and Dedovich, {T. G.} and J. Deng and J. Schambach",

note = "Publisher Copyright: {\textcopyright} 2016 The Author(s)",

year = "2016",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2016.07.046",

language = "English",

volume = "760",

pages = "689--696",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

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TY - JOUR

T1 - Jet-like correlations with direct-photon and neutral-pion triggers at sNN=200 GeV

AU - STAR Collaboration

AU - Adamczyk, L.

AU - Adkins, J. K.

AU - Agakishiev, G.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Alekseev, I.

AU - Anderson, D. M.

AU - Aparin, A.

AU - Arkhipkin, D.

AU - Aschenauer, E. C.

AU - Ashraf, M. U.

AU - Attri, A.

AU - Averichev, G. S.

AU - Bai, X.

AU - Bairathi, V.

AU - Bellwied, R.

AU - Bhasin, A.

AU - Bhati, A. K.

AU - Bhattarai, P.

AU - Bielcik, J.

AU - Bielcikova, J.

AU - Bland, L. C.

AU - Bordyuzhin, I. G.

AU - Bouchet, J.

AU - Brandenburg, J. D.

AU - Brandin, A. V.

AU - Bunzarov, I.

AU - Butterworth, J.

AU - Caines, H.

AU - Calderón de la Barca Sánchez, M.

AU - Campbell, J. M.

AU - Cebra, D.

AU - Chakaberia, I.

AU - Chaloupka, P.

AU - Chang, Z.

AU - Chatterjee, A.

AU - Chattopadhyay, S.

AU - Chen, X.

AU - Chen, J. H.

AU - Cheng, J.

AU - Cherney, M.

AU - Christie, W.

AU - Contin, G.

AU - Crawford, H. J.

AU - Das, S.

AU - De Silva, L. C.

AU - Debbe, R. R.

AU - Dedovich, T. G.

AU - Deng, J.

AU - Schambach, J.

PY - 2016/9/10

Y1 - 2016/9/10

N2 - Azimuthal correlations of charged hadrons with direct-photon (γdir) and neutral-pion (π0) trigger particles are analyzed in central Au+Au and minimum-bias p+p collisions at sNN=200 GeV in the STAR experiment. The charged-hadron per-trigger yields at mid-rapidity from central Au+Au collisions are compared with p+p collisions to quantify the suppression in Au+Au collisions. The suppression of the away-side associated-particle yields per γdir trigger is independent of the transverse momentum of the trigger particle (pTtrig), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons (pTassoc). Within uncertainty, similar levels of suppression are observed for γdir and π0 triggers as a function of zT (≡pTassoc/pTtrig). The results are compared with energy-loss-inspired theoretical model predictions. Our studies support previous conclusions that the lost energy reappears predominantly at low transverse momentum, regardless of the trigger energy.

AB - Azimuthal correlations of charged hadrons with direct-photon (γdir) and neutral-pion (π0) trigger particles are analyzed in central Au+Au and minimum-bias p+p collisions at sNN=200 GeV in the STAR experiment. The charged-hadron per-trigger yields at mid-rapidity from central Au+Au collisions are compared with p+p collisions to quantify the suppression in Au+Au collisions. The suppression of the away-side associated-particle yields per γdir trigger is independent of the transverse momentum of the trigger particle (pTtrig), whereas the suppression is smaller at low transverse momentum of the associated charged hadrons (pTassoc). Within uncertainty, similar levels of suppression are observed for γdir and π0 triggers as a function of zT (≡pTassoc/pTtrig). The results are compared with energy-loss-inspired theoretical model predictions. Our studies support previous conclusions that the lost energy reappears predominantly at low transverse momentum, regardless of the trigger energy.

UR - http://www.scopus.com/inward/record.url?scp=84979920374&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2016.07.046

DO - 10.1016/j.physletb.2016.07.046

M3 - Article

AN - SCOPUS:84979920374

SN - 0370-2693

VL - 760

SP - 689

EP - 696

JO - Physics Letters B

JF - Physics Letters B

ER -

Jet-like correlations with direct-photon and neutral-pion triggers at s_NN=200 GeV

Abstract

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