Ratio of Isolated Photon Cross Sections in pp¯ Collisions at √s=630 and 1800 GeV

Abazov, V. M.; Abbott, B.; Abdesselam, A.; Abolins, M.; Abramov, V.; Acharya, B. S.; Adams, D. L.; Adams, M. R.; Ahmed, S.; Alexeev, G. D.; Alton, A.; Alves, G. A.; Amos, N.; Anderson, E. W.; Arnoud, Y.; Ávila, C.; Baarmand, M. M.; Babintsev, V.; Babukhadia, L.; Bacon, T. C.; Baden, A.; Baldin, B.; Balm, P. W.; Banerjee, S.; Barberis, E.; Baringer, P.; Barreto, J.; Bartlett, J. F.; Bassler, U.; Bauer, D.; Bean, A.; Beaudette, F.; Begel, M.; Belyaev, A.; Beri, S. B.; Bernardi, G.; Bertram, I.; Besson, A.; Beuselinck, R.; Bezzubov, V. A.; Bhat, P. C.; Bhatnagar, V.; Bhattacharjee, M.; Blazey, G.; Blekman, F.; Blessing, S.; Boehnlein, A.; Bojko, N. I.; Borcherding, F.; Bos, K.; Bose, T.; Brandt, A.; Breedon, R.; Briskin, G.; Brock, R.; Brooijmans, G.; Bross, A.; Buchholz, D.; Buehler, M.; Buescher, V.; Буртовой, В. С.; Butler, J. M.; Canelli, F.; Carvalho, W.; Casey, D.; Casilum, Z.; Castilla‐Valdez, H.; Chakraborty, D.; Chan, K. M.; Chekulaev, S. V.; Cho, D. 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A.; Goss, L. T.; Gounder, K.; Goussiou, A. G.; Graf, N.; Graham, Gerard J.; Grannis, P. D.; Green, J. A.; Greenlee, H.; Greenwood, Z. D.; Grinstein, S.; Groer, L.; Grünendahl, S.; Gupta, A.; Gurzhiev, S. N.; Gutiérrez, G.; Gutiérrez, P.; Hadley, N. J.; Haggerty, H.; Hagopian, S.; Hagopian, V.; Hall, R. E.; Hanlet, P.; Hansen, S.; Hauptman, J. M.; Hays, C. P.; Hébert, C.; Hedin, D.; Heinmiller, J. M.; Heinson, A. P.; Heintz, U.; Heuring, T.; Hildreth, M.; Hirosky, R.; Hobbs, J.; Hoeneisen, B.; Huang, Y.; Illingworth, R.; Ito, A. S.; Jaffré, M.; Jain, Sa.; Jesik, R.; Johns, K.; Johnson, Mark D.; Jonckheere, A.; Jöstlein, H.; Rozas, A. Juste; Kahl, W.; Kahn, S.; Kajfasz, E.; Калинин, А.; Karmanov, D.; Karmgard, D. J.; Kehoe, R.; Khanov, A.; Kharchilava, A.; Kim, S. K.; Klima, B.; Knuteson, B.; Ko, W.; Kohli, J. M.; Kostritskiy, A. V.; Kotcher, J.; Kothari, B.; Kotwal, A.; Kozelov, A. V.; Kozlovsky, E. A.; Krane, J.; Krishnaswamy, M. R.; Krivkova, P.; Krzywdziński, S.; Kubantsev, M.; Kuleshov, S.; Kulik, Y.; Kunori, S.; Kupčo, A.; Кузнецов, В. Е.; Landsberg, G.; Lee, W. M.; Leflat, A.; Leggett, C.; Lehner, F.; Li, J.; Li, Q. Z.; Li, X.; Lima, J. G.R.; Lincoln, D.; Linn, S.; Linnemann, J.; Lipton, R.; Lucotte, A.; Lueking, L.; Lundstedt, C.; Luo, C.; Maciel, A. K.A.; Madaras, R. J.; Malyshev, V. L.; Manankov, V.; Mao, H. S.; Marshall, T.; Martin, M.; Mauritz, K. M.; May, B.; Mayorov, A. A.; McCarthy, R. L.; McMahon, T. J.; Melanson, H. L.; Merkin, M.; Merritt, K. W.; Miao, C.; Miettinen, H.; Mihalcea, D.; Mishra, C. S.; Mokhov, N.; Mondal, N. K.; Montgomery, H. E.; Moore, R. W.; Mostafa, M.; Motta, H. da; Nagy, E.; Nang, F.; Narain, M.; Narasimham, V. S.; Naumann, N. A.; Neal, H. A.; Negret, J. P.; Negroni, S.; Nunnemann, T.; O’Neil, D. 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doi:10.1103/physrevlett.87.251805

Cited by 50 publications

(39 citation statements)

References 24 publications

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“…Fig. 3 depicts recent CDF [8] and DØ [9] inclusive photon production cross-section measurements, which agree within experimental uncertainties and show that NLO pQCD has difficulty describing the behaviour in data at low photon p T . Further theoretical effort will be necessary to understand this discrepant region.…”

Section: Inclusive Photon Production and Double Parton Scatteringmentioning

confidence: 52%

QCD Tevatron results

Warburton¹

2010

Proceedings of XXth Hadron Collider Physics Symposium — PoS(HCP2009)

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Selected recent quantum chromodynamics (QCD) measurements are reviewed for Fermilab Run II Tevatron proton-antiproton collisions studied by the Collider Detector at Fermilab (CDF) and DØ Collaborations at a centre-of-mass energy of √ s = 1.96 TeV. Tantamount to Rutherford scattering studies at the TeV scale, inclusive jet and dijet production cross-section measurements are used to seek and constrain new particle physics phenomena, test perturbative QCD calculations, inform parton distribution function (PDF) determinations, and extract a precise value of the strong coupling constant, α s (m Z ) = 0.1161−0.0048 . Inclusive photon production cross-section measurements reveal an inability of next-to-leading-order (NLO) perturbative QCD (pQCD) calculations to describe low-energy photons arising directly in the hard scatter. Events with γ + 3-jet configurations are used to measure the increasingly important double parton scattering (DPS) phenomenon, with an obtained effective interaction cross section of σ eff = 16.4 ± 2.3 mb. Observations of central exclusive particle production demonstrate the viability of observing the Standard Model Higgs boson using similar techniques at the Large Hadron Collider (LHC). Three areas of inquiry into lower energy QCD, crucial to understanding high-energy collider phenomena, are discussed: the examination of intra-jet track kinematics to infer that jet formation is dominated by pQCD, and not hadronization, effects; detailed studies of the underlying event and its universality; and inclusive minimum-bias charged-particle momentum and multiplicity measurements, which are shown to challenge the Monte Carlo generators.

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Section: Inclusive Photon Production and Double Parton Scatteringmentioning

confidence: 52%

QCD Tevatron results

Warburton¹

2010

Proceedings of XXth Hadron Collider Physics Symposium — PoS(HCP2009)

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“…11, left panel). Apart of two (controversial) datasets from Fermilab E706 [134] and to some lesser extent the D0 results [145] the data are well described from √ s N N = 23 GeV to 1.96 TeV, covering 9 orders of magnitude in cross section. In Fig.…”

Section: Spectramentioning

confidence: 88%

“…Werlen, see also [32]). Sources of data: WA70 [135], UA6 [126], E706 [134], R110 [146], R806 [121], AFS [147], D0 [145], CDF [148,149]. Right: xT-scaling of the world data on direct photons in pp and pp as of 2012 (figure taken from [137]).…”

Section: Spectramentioning

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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“…From past to present, prompt photon production at hadron colliders has undergone very impressive experimental [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and theoretical developments. The experimental measurements cover a large domain of center-of-mass energy and also a wide range of photon transverse energy .…”

Section: Introductionmentioning

confidence: 99%

“…The experimental measurements cover a large domain of center-of-mass energy and also a wide range of photon transverse energy . The prompt photon production cross section at the LHC [11][12][13][14][15][16] has a significantly higher magnitude when compared to the Tevatron [3][4][5][6][7][8][9][10]. It is also much larger than the photoproduction cross section at HERA [42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Predictions for the Isolated Prompt Photon Production at the LHC ats= 13 TeV

Goharipour

Mehraban

2017

Advances in High Energy Physics

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The prompt photon production in hadronic collisions has a long history of providing information on the substructure of hadrons and testing the perturbative techniques of QCD. Some valuable information about the parton densities in the nucleon and nuclei, especially of the gluon, can also be achieved by analysing the measurements of the prompt photon production cross section whether inclusively or in association with heavy quarks or jets. In this work, we present predictions for the inclusive isolated prompt photon production in pp collisions at center-of-mass energy of 13 TeV using various modern PDF sets. The calculations are presented as a function of both photon transverse energy and pseudorapidity for the ATLAS kinematic coverage. We also study in detail the theoretical uncertainty in the cross sections due to the variation of the renormalization, factorization, and fragmentation scales. Moreover, we introduce and calculate the ratios of photon momenta for different rapidity regions and study the impact of various input PDFs on such quantity.

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Ratio of Isolated Photon Cross Sections in pp¯ Collisions at √s=630 and 1800 GeV

Cited by 50 publications

References 24 publications

QCD Tevatron results

QCD Tevatron results

Direct real photons in relativistic heavy ion collisions

Predictions for the Isolated Prompt Photon Production at the LHC ats= 13 TeV

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