Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in 
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 collisions at 
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Adare, A.; Aidala, C.; Ajitanand, N. N.; Akiba, Y.; Akimoto, R.; Alexander, J.; Alfred, M.; Andrieux, V.; Aoki, Kazuo; Apadula, N.; Aramaki, Y.; Asano, H.; Atomssa, E. T.; Awes, T. C.; Azmoun, B.; Babintsev, V.; Bai, Mei; Bai, Xiaozhi; Bandara, N. S.; Bannier, B.; Barish, K. N.; Bathe, S.; Baublis, V.; Baumann, C.; Baumgart, Stephen; Bazilevsky, A.; Beaumier, M.; Beckman, S.; Belmont, R.; Berdnikov, A.; Berdnikov, Y.; Black, Deirdre; Blau, D.; Bok, Jeongsu; Boyle, K.; Brooks, M. L.; Bryslawskyj, J.; Buesching, H.; Bumazhnov, V.; Butsyk, S.; Campbell, S.; Cervantes, R.; Chen, C. H.; Y., C.; Chiu, M.; Choi, I. J.; Choi, J.; Choi, S.; Christiansen, P.; Chujo, T.; Cianciolo, V.; Citron, Z. H.; Cole, B.; Cronin, N.; Crossette, N.; Csanád, M.; Csörgő, T.; Danley, T. W.; Datta, A.; Daugherity, M.; David, G.; DeBlasio, K.; Dehmelt, K.; Denisov, A.; Deshpande, A.; Desmond, E. J.; Ding, L.; Dion, A.; Dixit, Dhruv Utpalkumar; H., J.; d’Orazio, Laurent; Drapier, O.; Drees, A.; Drees, K. A.; Durham, J. M.; Durum, A.; Engelmore, T.; Enokizono, A.; En’yo, H.; Esumi, S.; Eyser, K. O.; Fadem, B.; Fan, W.; Feege, N.; Fields, D. E.; Finger, M.; Fleuret, F.; Fokin, S.; Frantz, J. E.; Franz, A.; Frawley, A. D.; Fukao, Y.; Fukuda, Y.; Fusayasu, T.; Gainey, K.; Gal, C.; Gallus, P.; Garg, P.; Garishvili, A.; Garishvili, I.; Ge, H.; Giordano, F.; Glenn, A.; Gong, X.; Gonin, M.; Goto, Y.; Cassagnac, R. Granier de; Grau, N.; Greene, S.; Perdekamp, M. Grosse; Gu, Y.; Gunji, T.; Guragain, H.; Hachiya, T.; Haggerty, J. S.; Hahn, K. I.; Hamagaki, H.; Hamilton, H. F.; Han, S. Y.; Hanks, J.; Hasegawa, S.; Haseler, T. O. S.; Hashimoto, K.; Hayano, R.; He, X.; Hemmick, T. K.; Hester, T.; Hill, J. C.; Hill, K. K.; Hollis, R. S.; Homma, K.; Hong, B.; Hoshino, T.; Hotvedt, N.; Huang, J.; Huang, S.; Ichihara, T.; Ikeda, Y.; Imai, K.; Imazu, Y.; Inaba, M.; Iordanova, A.; Isenhower, D.; Isinhue, A.; Ivanishchev, D.; Jacak, B.; Jeon, S.; Jezghani, M.; Jia, J.; Jiang, X.; Johnson, B. M.; Joo, E.; Joo, K. S.; Jouan, D.; Jumper, D. S.; Kamin, J.; Kanda, S.; Kang, B. H.; Kang, J. H.; Kang, J. S.; Kapukchyan, D.; Kapustinsky, J.; Karthas, E.; Kawall, D.; Kazantsev, A. V.; Key, J. A.; Khachatryan, V.; Khandai, P. K.; Khanzadeev, A.; Kihara, K.; Kijima, K. M.; Kim, C.; Kim, D. H.; Kim, D. J.; Kim, E. J.; Kim, H. J.; Kim, M.; Kim, Y. J.; Kim, Y. K.; Kincses, D.; Kistenev, E.; Klatsky, J.; Kleinjan, D.; Kline, P.; Koblesky, T.; Kofarago, M.; Komkov, B.; Koster, J.; Kotchetkov, D.; Kotov, D.; Křížek, F.; Kudo, S.; Kurita, K.; Kurosawa, M.; Kwon, Y. J.; Lacey, R.; Lai, Yue Shi; Lajoie, J. G.; Lebedev, A.; Lee, D. M.; Lee, G. H.; Lee, J.; Lee, K. B.; Lee, K. S.; Lee, S.; Lee, S. H.; Leitch, M. J.; Leitgab, M.; Leung, Y. H.; Lewis, B.; Li, X.; Lim, Sanghoon; Liu, M. X.; Loggins, V.-R.; Lovasz, K.; Lynch, D.; Maguire, C.; Majoros, T.; Makdisi, Y. I.; Makek, M.; Manion, A.; Manko, V.; Mannel, E.; McCumber, M.; McGaughey, P. L.; McGlinchey, D.; McKinney, C.; Meles, A.; Mendoza, M.; Meredith, B.; Miake, Y.; Mibe, T.; Mignerey, A. C.; Miller, A. J.; Milov, A.; Mishra, D.; Mitchell, J. T.; Mitsuka, G.; Miyasaka, S.; Mizuno, S.; Mohanty, A. K.; Mohapatra, S.; Montuenga, P.; Moon, T.; Morrison, D. P.; Moskowitz, Marc L.; Moukhanova, T. V.; Murakami, T.; Murata, J.; Mwai, A.; Nagae, T.; Nagai, K.; Nagamiya, S.; Nagashima, K.; Nagashima, T.; Nagle, J. L.; Nagy, M. I.; Nakagawa, I.; Nakagomi, H.; Nakamiya, Y.; Nakamura, K. R.; Nakamura, T.; Nakano, K.; Nattrass, C.; Netrakanti, P. K.; Nihashi, M.; Niida, T.; Nouicer, R.; Novák, T.; Novitzky, N.; Nyanin, A. S.; O’Brien, E.; Ogilvie, C. A.; Oide, H.; Okada, K.; Koop, J. D. Orjuela; Osborn, J. D.; Öskarsson, A.; Ottino, G. J.; Ozawa, K.; Pak, R.; Pantuev, V.; Papavassiliou, V.; Park, I. H.; Park, J. S.; Park, S.; Park, S. K.; Pate, S. F.; Patel, L.; Patel, M.; Peng, J. C.; Perepelitsa, D. V.; Perera, G. D. N.; Peressounko, D. Yu.; PerezLara, C. E.; Perry, J.; Petti, R.; Phipps, M. W.; Pinkenburg, C.; Pinson, R.; Pisani, R. P.; Purschke, M. L.; Qu, H.; Rak, J.; Ravinovich, I.; Read, K. F.; Reynolds, D.; Riabov, V.; Riabov, Y.; Richardson, E.; Rinn, Timothy Thomas; Riveli, N.; Roach, D.; Rolnick, S. D.; Rosati, M.; Rowan, Z.; Rubin, J.; Ryu, M. S.; Safonov, A.; Sahlmueller, B.; Saito, N.; Sakaguchi, T.; Sako, H.; Samsonov, V.; Sarsour, M.; Sato, Susumu; Sawada, S.; Schaefer, B.; Schmoll, B. K.; Sedgwick, K.; Seele, J.; Seidl, R.; Sekiguchi, Y.; Sen, A.; Seto, R.; Sett, P.; Sexton, A.; Sharma, D.; Shaver, A.; Shein, I.; Shibata, T. A.; Shigaki, K.; Shimomura, M.; Shioya, T.; Shoji, K.; Shukla, P.; Sickles, A. M.; Silva, C. L.; Silvermyr, D.; Singh, B. K.; Singh, C. P.; Singh, V. K.; Skolnik, M.; Slunečka, M.; Snowball, M.; Solano, S.; Soltz, R. A.; Sondheim, W. E.; Sörensen, S.; Sourikova, I. V.; Stankus, P. W.; Steinberg, P.; Stenlund, E.; Stepanov, M.; Ster, A.; Stoll, S. P.; Stone, M. R.; Sugitate, T.; Sukhanov, A.; Sumita, T.; Sun, J.; Sziklai, J.; Takahara, A.; Taketani, A.; Tanaka, Y.; Tanida, K.; Tannenbaum, M. J.; Tarafdar, S.; Taranenko, A.; Tarnai, G.; Tennant, E.; Tieulent, R.; Timilsina, A.; Todoroki, T.; Tomášek, M.; Torii, H.; Towell, C. L.; Towell, M.; Towell, R. S.; Tserruya, I.; Ueda, Y.; Ujvári, B.; Hecke, H. W. van; Vargyas, M.; Vazquez-Zambrano, E.; Veicht, A.; Velkovska, J.; Vértesi, R.; Virius, M.; Vrba, V.; Vukman, N.; Vznuzdaev, E.; Wang, X. R.; Watanabe, Daisuke; Watanabe, K.; Watanabe, Y.; Wei, F.; Whitaker, S.; Wolin, S.; Wong, C. P.; Woody, C. L.; Wysocki, M.; Xia, B.; Xu, C.; Xu, Q.; Xue, L.; Yalcin, S.; Yamaguchi, Y.; Yamamoto, Hiroshi; Yanovich, A.; Yokkaichi, S.; Yoo, J.; Yoon, I.; Zhou, You; Younus, I.; Yu, H.; Yushmanov, I. E.; Zajc, W. A.; Zelenski, A.; Zhou, S.; Zou, L.

doi:10.1103/physrevd.95.072002

Cited by 15 publications

(44 citation statements)

References 72 publications

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“…When comparing to the analogous bins from Ref. [4], the p+Au p 2 out nonperturbative momentum widths show a stronger dependence on p trig T , indicating that if the decreasing widths are due to factorization breaking these effects could be stronger in p+A collisions. In addition to possible effects from factorization breaking, the correlations were studied as a function of centrality to investigate possible effects from k T broadening and multiple scattering in p+A collisions.…”

Section: Results In P+aumentioning

confidence: 69%

See 1 more Smart Citation

Study of cold and hot nuclear matter effects on jets with direct photon triggered correlations from PHENIX

Osborn

2017

Nuclear Physics A

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Direct photons, being colorless objects, provide an unmodified control particle that can be used in conjunction with jets to probe the quark-gluon plasma. To leading order the direct photon momentum balances the momentum of opposing jets and can therefore provide a clean handle on the jet energy. Therefore, angular correlations with direct photons provide a mechanism to study the fragmentation of the opposing jet without performing jet reconstruction. Jet fragmentation modification has been measured previously in PHENIX in central Au+Au collisions. Recent RHIC runs offer the potential to study these observables in heavy ion collisions with greater statistics and over different collision systems including asymmetric collision geometries. In this talk we present results of isolated direct photon-triggered correlations in d+Au collisions and discuss the constraints of cold nuclear matter effects on the fragmentation functions. We also present the latest results with higher statistics on direct photon-triggered correlations in Au+Au collisions including differential measurements of fragmentation function modification. Finally, we present the status of the centrality and collision species dependence of these observables, including comparisons to related dihadron correlations. Together these results can give a view of jet modification going from small to large system size.

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Section: Results In P+aumentioning

confidence: 69%

“…Ref. [4] on the away-side to extract the quantity p 2 out , a quantity similar to the Gaussian width of the p out distributions shown in Fig. 1.…”

Section: Results In P+aumentioning

confidence: 99%

Study of cold and hot nuclear matter effects on jets with direct photon triggered correlations from PHENIX

Osborn

2017

Nuclear Physics A

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“…A previous measurement in p þ p collisions at ffiffi ffi s p ¼ 510 GeV found that nonperturbative momentum widths in dihadron and direct photon-hadron angular correlations binned in a fixed range of the away-side associated hadron p T decreased with the hard scale of the interaction, which is qualitatively opposite to what is expected from Collins-Soper-Sterman (CSS) evolution [32], which comes directly out of the derivation of TMD factorization [33]. This study is intended to extend the analysis of Ref.…”

Section: Introductionmentioning

confidence: 62%

“…This study is intended to extend the analysis of Ref. [32] at a smaller center-of-mass energy; therefore, this measurement supplants the previous PHENIX analysis at ffiffi ffi s p ¼ 200 GeV [34] with an approximately four times increase in integrated luminosity. The two different center-of-mass energies of Ref.…”

Section: Introductionmentioning

confidence: 83%

Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in p+p collisions at s=200 GeV

Aidala¹,

Akiba²,

Alfred³

et al. 2018

Phys. Rev. D

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Dihadron and isolated direct photon-hadron angular correlations are measured in p þ p collisions at ffiffi ffi s p ¼ 200 GeV. The correlations are sensitive to nonperturbative initial-state and final-state transverse momenta k T and j T in the azimuthal nearly back-to-back region Δϕ ∼ π. To have sensitivity to small transverse momentum scales, nonperturbative momentum widths of p out , the out-of-plane transversemomentum component perpendicular to the trigger particle, are measured. In this region, the evolution of p out can be studied when several different hard scales are measured. These widths are used to investigate possible effects from transverse-momentum-dependent factorization breaking. When accounting for the longitudinal-momentum fraction of the away-side hadron with respect to the near-side trigger particle, the widths are found to increase with the hard scale; this is qualitatively similar to the observed behavior in Drell-Yan and semi-inclusive deep-inelastic scattering interactions, where factorization is predicted to hold. The momentum widths are also studied as a function of center-of-mass energy by comparing to previous measurements at ffiffi ffi s p ¼ 510 GeV. The nonperturbative jet widths also appear to increase with ffiffi ffi s p at a similar x T , which is qualitatively consistent to similar measurements in Drell-Yan interactions. Future detailed global comparisons between measurements of processes where transverse-momentum-dependent factorization is predicted to hold and be broken will provide further insight into the role of color in hadronic interactions.

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“…the trigger p T ). Measurements of π 0 -h and γ-h correlations in pp at √ s =200 and 510 GeV [177,178] have so far not confirmed factorization breaking in these processes. As mentioned earlier, the qq → γγ and the gg → γγ channels give access to the primordial (or intrinsic) k T of partons, the driving factor behind the Cronin-effect [179].…”

Section: Photon-jet Photon-hadron and Photon-photon Correlationsmentioning

confidence: 99%

Direct real photons in relativistic heavy ion collisions

David

2020

Rep. Prog. Phys.

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Direct real photons are arguably the most versatile tools to study relativistic heavy ion collisions. They are produced, by various mechanisms, during the entire space-time history of the strongly interacting system. Also, being colorless, most the time they escape without further interaction, i.e. they are penetrating probes. This makes them rich in information, but hard to decypher and interpret. This review presents the experimental and theoretical developments related to direct real photons since the 1970s, with a special emphasis on the recently emerged "direct photon puzzle", the simultaneous presence of large yields and strong azimuthal asymmetries of photons in heavy ion collisions, an observation that so far eluded full and coherent explanation. CONTENTS arXiv:1907.08893v1 [nucl-ex] 21 Jul 2019 21. Hydrodynamical models 48 2. Initial state, (fast) thermalization 50 3. Transport calculations 50 4. Other ideas 52 VII. Concluding remarks 54 VIII. Acknowledgements 55 References 56 3 I. INTRODUCTIONThe centuries old quest to reveal the "ultimate" constituents of matter and the laws of Nature governing them, and the realization from quantum mechanics that mapping smaller and smaller objects requires ever larger energy probes, made high energy physics one of the dominant scientific disciplines of the XXth century. At first we took advantage of the Universe as an "accelerator" providing high energy probes (cloud chamber and emulsion experiments), but soon we started to build our own accelerators, constantly increasing their energy and luminosity. The most spectacular and best known results came in elementary particle physics, but astrophysics and nuclear physics were a close second, benefiting enormously from the progress in experimental and theoretical tools. The central question in particle physics was the substructure of hadrons and the nature of confinement, while high energy nuclear physics' foremost concern was the behavior of high density nuclear matter, including its collectivity and possible phase transition into partonic matter, which in turn evoked the early stages of the Universe. Albeit particle and nuclear physics came with different perspectives, both were concerned with the strong interaction and its underlying theory, quantum chromodynamics (QCD), so the birth of a new discipline at their intersection, relativistic heavy ion physics, was almost inevitable. From Princeton and Berkeley to Dubna the race for larger and larger ions, energies and luminosities was on. Hadrons and nuclear fragments were studied extensively, and the applicability of thermo-and hydrodynamics gradually recognized. An excellent review of these first facilities and early developments -both experimental and theoretical -can be found in [1] by Goldhaber, while a (literally) insightful account of the genesis and achievements of RHIC and LHC was given by Baym in [2].Although lepton and photon production in hadronic and nuclear collisions was studied almost since the birth of quantum mechanics and quantum electrodynamics [3][4][...

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Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in p+p collisions at s=510

Cited by 15 publications

References 72 publications

Study of cold and hot nuclear matter effects on jets with direct photon triggered correlations from PHENIX

Study of cold and hot nuclear matter effects on jets with direct photon triggered correlations from PHENIX

Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in p+p collisions at s=200 GeV

Direct real photons in relativistic heavy ion collisions

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