Inclusive photon production in pA and AA collisions at 200 GeV/u

Åkesson, T. P. A.; Almehed, S.; Angelis, A.L.S.; Armenise, N.; Atherton, H.; Aubry, P.; Bartels, H. W.; Beaudoin, G.; Beaulieu, J. M.; Beker, H.; Benary, O.; Bettoni, D.; Bisi, V.; Blevis, I.; Bøggild, H.; Cleland, W.; Clemen, M.; Collick, B.; Corriveau, F.; Dagan, S.; Dederichs, K.; Dell'Uomo, S.; Depommier, P.; Devenish, R.C.E.; Liberto, S. Di; DiGiacomo, N.J.; Dodd, J.; Dogolshein, B.; Drees, A.; En’yo, H.; Erlandsson, B.; Esten, M.J.; Fabjan, C.; Fischer, P.; Fraenkel, Z.; Gaidot, A.; Gibrat-Debu, F.; Giubellino, P.; Glässel, P.; Goerlach, U.; Haglund, Richard F.; Hamel, L. A.; Hecke, H. Van; Hedberg, V.; Heifetz, R.; Hölscher, A.; Jacak, B.; Jarlskog, G.; Johansson, S.; Kraner, H.W.; Kroth, V.; Lamarche, F.; Leroy, C.; Lissauer, D.; London, G.W.; Lörstad, B.; Lounis, A.; Martelli, F.; Marzari‐Chiesa, A.; Masera, M.; Mazzoni, M. A.; Mazzucato, E.; McCubbin, M.; McCubbin, N. A.; McGaughey, P. L.; Meddi, F.; Mjörnmark, U.; Muciaccia, M. T.; Muraviev, S.; Murray, M.; Neubert, Matthias; Nilsson, S.; Olsen, L.; Oren, Y.; Pansart, J. P.; Park, Y. M.; Pfeiffer, A.; Piuz, F.; Polychronakos, V.; Poulard, G.; Price, Michael; Rahm, D.; Ramello, L.; Riccati, L.; Romano, G.; Rosa, G.; Šándor, L.; Schukraft, J.; Sekimoto, M.; Selldén, B.; Seman, M.; Shmeleva, A.; Sidoroy, V.; Simone, S.; Sirois, Y.; Sletten, H.; Smirnov, S. Yu.; Soltani, J.; Sondheim, W. E.; Specht, H. J.; Stumer, I.; Sunier, J. W.; Toherniatin, V.; Thodberg, Hans Henrik; Thompson, J.; Tikhomirov, V. O.; Tserruya, I.; Vasseur, G.; Veenhoff, R.; Wigmans, R.; Yepes, P.

doi:10.1007/bf01621024

Cited by 21 publications

(6 citation statements)

References 10 publications

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“…The results constitute the first observation of direct photons in ultrarelativistic heavy-ion collisions which could be significant for diagnosis of quark gluon plasma formation. 25.75.+r, 13.40.-f, 24.90.+p The observation of a new phase of strongly interacting matter, the quark gluon plasma (QGP), is one of the most important goals of current nuclear physics research. An extensive experimental program has been undertaken at the CERN SPS accelerator with Pb-ion beams of 158AGeV to search for and investigate the QGP.…”

mentioning

confidence: 99%

“…To a great extent, especially at higher √ s, these data can be successfully described by perturbative QCD calculations and provide an important foundation from which to study photon production in nucleus-nucleus collisions. First attempts to observe direct photon production in ultrarelativistic heavy-ion collisions with oxygen and sulphur beams found no significant excess [13][14][15][16]. The WA80 collaboration [16] provided the most interesting result with a p T dependent upper limit on the direct photon production in S+Au collisions at 200AGeV.…”

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confidence: 99%

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Observation of Direct Photons in Central158AGeVP208b
Aggarwal¹,
Agnihotri²,
Ahammed³
et al. 2000
Phys. Rev. Lett.
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A measurement of direct photon production in 208 Pb+ 208 Pb collisions at 158 A GeV has been carried out in the CERN WA98 experiment. The invariant yield of direct photons in central collisions is extracted as a function of transverse momentum in the interval 0.5 < pT < 4 GeV/c. A significant direct photon signal, compared to statistical and systematical errors, is seen at pT > 1.5 GeV/c. The results constitute the first observation of direct photons in ultrarelativistic heavy-ion collisions which could be significant for diagnosis of quark gluon plasma formation. 25.75.+r,13.40.-f,24.90.+p 1

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confidence: 99%

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confidence: 99%

Observation of Direct Photons in Central158AGeVP208b
Aggarwal¹,
Agnihotri²,
Ahammed³
et al. 2000
Phys. Rev. Lett.
Self Cite
185
3
97
0
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“…The fixed target heavy ion program at CERN SPS started in 1986 and soon the search for thermal radiation from the system formed in nucleus-nucleus collisions was underway. The first results on inclusive photon production and its comparison to the expected hadron decay yield in p+A and A+A col lisions were published by the HELIOS/NA34 collaboration [191]. Protons, 16 O and 32 S beams were used on W and Pt targets, and photons were measured with the (external) conversion technique (section 3.2).…”

Section: Sps Fnal and Agsmentioning

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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“…This fact makes the real photon measurements particularly challenging. At SPS energies, the first attempts to observe direct photon production in ultrarelativistic nuclear collisions with O and S beams found no significant excess [19]. The WA80 collaboration has obtained upper bounds for the p T spectrum of real photons generated in S + Au collisions at 200 AGeV [20].…”

Section: Real Photonsmentioning

confidence: 99%

Direct photons and thermal dileptons: A theoretical review

Gale¹

2002

Nuclear Physics A

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Inclusive photon production in pA and AA collisions at 200 GeV/u

Cited by 21 publications

References 10 publications

Observation of Direct Photons in Central158AGeVP208b
Aggarwal¹,
Agnihotri²,
Ahammed³
et al. 2000
Phys. Rev. Lett.
Self Cite
185
3
97
0
View full text Add to dashboard Cite

Observation of Direct Photons in Central158AGeVP208b
Aggarwal¹,
Agnihotri²,
Ahammed³
et al. 2000
Phys. Rev. Lett.
Self Cite
185
3
97
0
View full text Add to dashboard Cite

Direct real photons in relativistic heavy ion collisions

Direct photons and thermal dileptons: A theoretical review

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Inclusive photon production in pA and AA collisions at 200 GeV/u

Cited by 21 publications

References 10 publications

Observation of Direct Photons in Central158AGeVP208bAggarwal1, Agnihotri2, Ahammed3 et al. 2000Phys. Rev. Lett.Self Cite1853970View full textAdd to dashboardCite

Observation of Direct Photons in Central158AGeVP208bAggarwal1, Agnihotri2, Ahammed3 et al. 2000Phys. Rev. Lett.Self Cite1853970View full textAdd to dashboardCite

Direct real photons in relativistic heavy ion collisions

Direct photons and thermal dileptons: A theoretical review

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Observation of Direct Photons in Central158AGeVP208b
Aggarwal¹,
Agnihotri²,
Ahammed³
et al. 2000
Phys. Rev. Lett.
Self Cite
185
3
97
0
View full text Add to dashboard Cite

Observation of Direct Photons in Central158AGeVP208b
Aggarwal¹,
Agnihotri²,
Ahammed³
et al. 2000
Phys. Rev. Lett.
Self Cite
185
3
97
0
View full text Add to dashboard Cite