Heavy-ion collisions at the LHC—Last call for predictions

Armesto, N.; Borghini, Nicolas; Jeon, Sangyong; Wiedemann, Urs Achim; Abreu, Samuel; Akkelin, S. V.; Alam, Jan-e; Albacete, Javier L.; Andronic, A.; Antonov, Dmitri; Arleo, François; Arsene, I. C.; Barnaföldi, G. G.; Barrette, J.; Bäuchle, Bjørn; Becattini, F.; Betz, Barbara; Bleicher, Marcus; Bluhm, Marcus; Boer, Daniël; Bopp, Fritz; Braun‐Munzinger, P.; Bravina, L.; Busza, W.; Cacciari, Matteo; Capella, A.; Casalderrey-Solana, Jorge; Chatterjee, Rupa; Chen, Lie‐Wen; Cleymans, J.; Cole, B.; Valle, Z. Conesa del; Csernai, L. P.; Cunqueiro, L.; Dainese, A.; Deus, J. Dias de; Ding, Heng-Tong; Djordjevic, Magdalena; Drescher, H. J.; Dremin, I. M.; Dumitru, Adrian; El, A.; Engel, R.; d’Enterria, D.; Eskola, Kari J.; Fái, George; Ferreiro, E. G.; Fries, Rainer J.; Frodermann, Evan; Fujii, H.; Gale, Charles; Gelis, François; Gonçalves, V. P.; Greco, V.; Greiner, Carsten; Gyulassy, Miklós; Hees, Hendrik van; Heinz, Ulrich; Honkanen, H.; Horowitz, W. A.; Iancu, Edmond; Ingelman, G.; Jalilian‐Marian, Jamal; Kaǐdalov, A. B.; Kämpfer, B.; Kang, Zhong‐Bo; Karpenko, Iu.; Kestin, Gregory; Kharzeev, Dmitri E.; Ko, Che Ming; Koch, Benjamin; Kopeliovich, B. Z.; Kozlov, Misha; Kraus, I.; Kuznetsova, Inga; Lee, S. H.; Lednický, R.; Letessier, Jean; Levin, E.; Li, B. A.; Lin, Zi-Wei; Liu, H.; Liu, W.; Loizides, C.; Lokhtin, I.; Machado, M. V. T.; Malinina, L.; Managadze, A. K.; Mangano, M.; Mannarelli, Massimo; Manuel, Cristina; Martı́nez, G.; Milhano, José Guilherme; Mócsy, Ágnes; Molnór, D.; Nardi, M.; Nayak, Jajati K.; Niemi, Harri; Oeschler, H.; Ollitrault, Jean-Yves; Paić, G.; Pajares, C.; Pantuev, V.; Papp, Gábor; Peressounko, D. Yu.; Petreczky, Péter; Petrushanko, S.; Piccinini, F.; Pierog, T.; Pirner, Hans J.; Porteboeuf, Sarah Julie; Potashnikova, I. K.; Qin, Guang-You; Qiu, Jian‐Wei; Rafelski, Johann; Rajagopal, Krishna; Ranft, J.; Rapp, Ralf; Rasanen, Sami Sakari; Rathsman, Johan; Rau, Philip; Redlich, K.; Renk, Thorsten; Rezaeian, Amir H.; Rischke, D.; Roesler, S.; Ruppert, Jörg; Ruuskanen, P. V.; Salgado, Carlos A.; Sapeta, Sebastian; Sarčević, Ina; Sarkar, Sourav; Sarycheva, L.; Schmidt, Iván; Shoshi, Arif I.; Sinha, Bikash; Sinyukov, Yu. M.; Snigirev, A.; Srivastava, D. K.; Stachel, J.; Staśto, Anna; Stöcker, H.; Teplov, C. Yu.; Thews, Robert L.; Torrieri, Giorgio; Pop, V. Topor; Triantafyllopoulos, D.N.; Tuchin, Kirill; Turbide, Simon; Tywoniuk, Konrad; Utermann, Andre; Venugopalan, Raju; Vitev, Ivan; Vogt, R.; Wang, E.; Wang, X. N.; Werner, K.; Wessels, Erik; Wheaton, S.; Wicks, Simon; Wolschin, Georg; Xiao, Bo-Wen; Xu, Zhe; Yasui, Shigehiro; Zabrodin, E.; Zapp, Korinna; Zhang, B.; Zhang, B. W.; Zhang, H.; Zhou, D.

doi:10.1088/0954-3899/35/5/054001

Cited by 282 publications

(185 citation statements)

References 426 publications

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“…This suppression is almost completely independent of p T . The approximate value of R CP ∼ 1 2 and the slight increase with p T are qualitatively consistent with predictions using the PYQUEN MC event generator [229]. As the angular size of the jets is increased, by increasing the R parameter, the R CP also increases.…”

Section: Resultssupporting

confidence: 85%

Jet Quenching in Relativistic Heavy Ion Collisions at the LHC

Angerami¹

2014

Springer Theses

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Section: Resultssupporting

confidence: 85%

Jet Quenching in Relativistic Heavy Ion Collisions at the LHC

Angerami¹

2014

Springer Theses

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“…There are two contributions: a constant value of 0.1 for a particle from the corona region, as was predicted in ref. [4], and a new momentum dependent component when matter becomes more transparent for fast parton, which loses 7 GeV. This provides excellent agreement with the data.…”

supporting

confidence: 75%

“…The proposed model in [1] works well at RHIC energy. In "The last call for prediction" published prior to the start of LHC we also proposed some features which should be observed at LHC if a similar picture with formation time is valid [4] (see pages 119-121 and figures 99-100 in the e-print version). As we already mentioned, the formation time should be proportional to the mean distance between interactions with the color exchange.…”

mentioning

confidence: 99%

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Corona effect in AA collisions at the LHC

Pantuev

2017

Jetp Lett.

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Following our earlier finding based on RHIC data on the dominant jet production from nucleus corona region, we reconsider this effect in nucleus-nucleus collisions at LHC energies. Our hypothesis was based on experimental data, which raised the idea of a finite formation time for the produced medium. At RHIC energy and in low density corona region this time reaches about 2 fm/c. Following this hypothesis, the nuclear modification factor RAA at high pt should be independent on particle momentum, and the azimuthal anisotropy of high pt particles, v2, should be finite. A separate prediction held that, at LHC energy, the formation time in the corona region should be about 1 fm/c. New data at LHC show that RAA is not flat and is rising with pt. We add to our original hypothesis an assumption that a fast parton traversing the produced medium loses the fixed portion of its energy. A shift of about 7 GeV from the original power law p −6 production cross section in pp explains well all the observed RAA dependencies. The shift of about 7 GeV is also valid at RHIC energy. We also show that the observed at LHC dependence of v2 at high pt and our previous predictions agree.Over the last 17 years of relativistic nucleus-nucleus collisions at RHIC and LHC, a set of observables was found which confirms the formation of high energy and high density matter. Among these features are the strong jet suppression manifested in particle suppression at high transverse momentum, p t , and large particle anisotropy. There is also a long list of models and theoretical assumptions to explain these effects. In our view, when one talks about jet suppression, a significant effect of particle production from the nucleus corona region is often ignored or underestimated. In a previous publication based purely on experimental data at RHIC, a simple model was proposed [1] to explain the angular dependence in the reaction plane of the nuclear modification factor R AA . The model nicely described the centrality and azimuthal dependence (or factor v 2 for high p t ) of R AA at RHIC energy. In the model, there is one free parameter of about 2.3 fm/c which was interpreted as plasma formation time at the low density corona region. The physical meaning of this parameter is that fast partons have roughly this time to escape from the produced medium and, theafter, they are absorbed by the absolutely opaque central region. This value of T 0 =2.3 fm/c is not "crazy large" because the number of nuclear collisions, N coll , near corona region is rather small, but it should be less than 0.8 fm/c in the core region of the produced matter [2]. Time, necessary to form the strongly interacting colored matter, should be proportional to the mean distance between the interaction or collision points with a color exchange. This distance, itself, should be inversely proportional to the square root of the density of such interactions. The 1) e-mail: pantuev@inr.ru picture in some sense is similar to the percolation scenario [3]. If the density of N coll in x−y plane of col...

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“…2 In the limit Nc, g In addition to the gauge theory directions, the gravity description always includes a radial direction (denoted by ρ in figure 1) which is dual to the gauge theory energy scale. The radial position of the horizon is proportional to the plasma temperature T .…”

Section: A Universal Mechanism Of Quark Energy Lossmentioning

confidence: 99%

Cherenkov mesons as in-medium quark energy loss

Casalderrey-Solana

Fernández

Matéos

2010

J. High Energ. Phys.

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Abstract:We recently showed that a heavy quark moving sufficiently fast through a quark-gluon plasma may lose energy by Cherenkov-radiating mesons [1]. Here we review our previous holographic calculation of the energy loss in N = 4 Super Yang-Mills and extend it to longitudinal vector mesons and scalar mesons. We also discuss phenomenological implications for heavy-ion collision experiments. Although the Cherenkov energy loss is an O(1/N c ) effect, a ballpark estimate yields a value of dE/dx for N c = 3 which is comparable to that of other mechanisms.

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Heavy-ion collisions at the LHC—Last call for predictions

Abstract: This writeup is a compilation of the predictions for the forthcoming Heavy Ion Program at the Large Hadron Collider, as presented at the CERN Theory Institute ‘Heavy Ion Collisions at the LHC—Last Call for Predictions’, held from 14th May to 10th June 2007.

Cited by 282 publications

References 426 publications

Jet Quenching in Relativistic Heavy Ion Collisions at the LHC

Jet Quenching in Relativistic Heavy Ion Collisions at the LHC

Corona effect in AA collisions at the LHC

Cherenkov mesons as in-medium quark energy loss

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