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arXiv · 1803.01749

Measurement of two-particle correlations with respect to second- and third-order event planes in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV

A. Adare·S. Afanasiev·C. Aidala·N. N. Ajitanand·Y. Akiba·H. Al-Bataineh·J. Alexander·M. Alfred·K. Aoki·Y. Aramaki·E. T. Atomssa·R. Averbeck·T. C. Awes·B. Azmoun·V. Babintsev·A. Bagoly·M. Bai·G. Baksay·L. Baksay·K. N. Barish·B. Bassalleck·A. T. Basye·S. Bathe·V. Baublis·C. Baumann·A. Bazilevsky·S. Belikov·R. Belmont·R. Bennett·A. Berdnikov·Y. Berdnikov·A. A. Bickley·M. Boer·J. S. Bok·K. Boyle·M. L. Brooks·J. Bryslawskyj·H. Buesching·V. Bumazhnov·G. Bunce·S. Butsyk·C. M. Camacho·S. Campbell·V. Canoa Roman·C. -H. Chen·C. Y. Chi·M. Chiu·I. J. Choi·R. K. Choudhury·P. Christiansen·T. Chujo·P. Chung·O. Chvala·V. Cianciolo·Z. Citron·B. A. Cole·M. Connors·P. Constantin·M. Csanád·T. Csörgő·T. Dahms·S. Dairaku·I. Danchev·T. W. Danley·K. Das·A. Datta·G. David·K. Dehmelt·A. Denisov·A. Deshpande·E. J. Desmond·O. Dietzsch·A. Dion·J. H. Do·M. Donadelli·O. Drapier·A. Drees·K. A. Drees·J. M. Durham·A. Durum·D. Dutta·S. Edwards·Y. V. Efremenko·F. Ellinghaus·T. Engelmore·A. Enokizono·H. En'yo·S. Esumi·B. Fadem·W. Fan·N. Feege·D. E. Fields·M. Finger·M. Finger, Jr.·F. Fleuret·S. L. Fokin·Z. Fraenkel·J. E. Frantz·A. Franz·A. D. Frawley
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Abstract

We present measurements of azimuthal correlations of charged hadron pairs in $\sqrt{s_{_{NN}}}=200$ GeV Au$+$Au collisions for the trigger and associated particle transverse-momentum ranges of $1 4$~GeV/$c$) correlations is suppressed compared to that of correlations measured in $p$$+$$p$ collisions. At the lowest associated particle $p_T$ ($0.5<p_T^a<1$ GeV/$c$), the away-side shape and yield are modified relative to those in $p$$+$$p$ collisions. These observations are consistent with the scenario of radiative-jet energy loss. For the low-$p_T$ trigger correlations ($2<p_T^t<4$ GeV/$c$), a finite away-side yield exists and we explore the dependence of the shape of the away-side within the context of an underlying-event model. Correlations are also studied differentially versus event-plane angle $\Psi_2$ and $\Psi_3$. The angular correlations show an asymmetry when selecting the sign of the difference between the trigger-particle azimuthal angle and the $\Psi_2$ event plane. This asymmetry and the measured suppression of the pair yield out of plane is consistent with a path-length-dependent energy loss. No $\Psi_3$ dependence can be resolved within experimental uncertainties.

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A. Adare, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander, M. Alfred, K. Aoki, Y. Aramaki, E. T. Atomssa, R. Averbeck, T. C. Awes, B. Azmoun, V. Babintsev, A. Bagoly, M. Bai, G. Baksay, L. Baksay, K. N. Barish, B. Bassalleck, A. T. Basye, S. Bathe, V. Baublis, C. Baumann, A. Bazilevsky, S. Belikov, R. Belmont, R. Bennett, A. Berdnikov, Y. Berdnikov, A. A. Bickley, M. Boer, J. S. Bok, K. Boyle, M. L. Brooks, J. Bryslawskyj, H. Buesching, V. Bumazhnov, G. Bunce, S. Butsyk, C. M. Camacho, S. Campbell, V. Canoa Roman, C. -H. Chen, C. Y. Chi, M. Chiu, I. J. Choi, R. K. Choudhury, P. Christiansen, T. Chujo, P. Chung, O. Chvala, V. Cianciolo, Z. Citron, B. A. Cole, M. Connors, P. Constantin, M. Csanád, T. Csörgő, T. Dahms, S. Dairaku, I. Danchev, T. W. Danley, K. Das, A. Datta, G. David, K. Dehmelt, A. Denisov, A. Deshpande, E. J. Desmond, O. Dietzsch, A. Dion, J. H. Do, M. Donadelli, O. Drapier, A. Drees, K. A. Drees, J. M. Durham, A. Durum, D. Dutta, S. Edwards, Y. V. Efremenko, F. Ellinghaus, T. Engelmore, A. Enokizono, H. En'yo, S. Esumi, B. Fadem, W. Fan, N. Feege, D. E. Fields, M. Finger, M. Finger, Jr., F. Fleuret, S. L. Fokin, Z. Fraenkel, J. E. Frantz, A. Franz, A. D. Frawley. 2018-03-05. Measurement of two-particle correlations with respect to second- and third-order event planes in Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. https://doi.org/10.1103/physrevc.99.054903

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