Search for direct single-photon production at large pT in photon-proton collisions at √s = 62.4 GeV

Angelis, A. L. S.; Besch, H.J.; Blumenfeld, B.; Camilleri, L.; Chapin, T. J.; Cool, R. L.; Papa, C. Del; Lella, L. Di; Dimcovski, Z.; Hollebeek, R. J.; Lederman, Leon M.; Levinthal, D.; Linnemann, J.; Newman, C. B.; Phinney, N.; Pope, B. G.; Pordes, S.; Rothenberg, A.; Rusack, R.; Segar, A. M.; Singh-Sidhu, J.; Smith, A. M.; Tannenbaum, M. J.; Vidal, R. A.; Wallace-Hadrill, J.; Yelton, J.; Young, K. K.

doi:10.1016/0370-2693(80)90836-9

Cited by 70 publications

(11 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Prompt photon production at hadron colliders provides a handle for testing perturbative QCD (pQCD) predictions [1,2]. Photons provide a colorless probe of quarks in the hard partonic interaction and the subsequent partonshower.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the inclusive isolated prompt photon cross section inppcollisions ats=7 TeVwith the ATLAS detector

Aad¹,

Abbott²,

Abdallah³

et al. 2011

Phys. Rev. D

Self Cite

142

107

View full text Add to dashboard Cite

A measurement of the cross section for the inclusive production of isolated prompt photons in pp collisions at a center-of-mass energy ffiffi ffi s p ¼ 7 TeV is presented. The measurement covers the pseudorapidity ranges j j < 1:37 and 1:52 j j < 1:81 in the transverse energy range 15 E T < 100 GeV. The results are based on an integrated luminosity of 880 nb À1 , collected with the ATLAS detector at the Large Hadron Collider. Photon candidates are identified by combining information from the calorimeters and from the inner tracker. Residual background in the selected sample is estimated from data based on the observed distribution of the transverse isolation energy in a narrow cone around the photon candidate. The results are compared to predictions from next-to-leading-order perturbative QCD calculations.

show abstract

Section: Introductionmentioning

confidence: 99%

Measurement of the inclusive isolated prompt photon cross section inppcollisions ats=7 TeVwith the ATLAS detector

Aad¹,

Abbott²,

Abdallah³

et al. 2011

Phys. Rev. D

Self Cite

142

107

View full text Add to dashboard Cite

show abstract

“…The symbols with different colors represent the results from different rapidity intervals and measured by the UA6, CCOR, R806, R110 Collaborations. [ 77–80 ] For clarity, the symbols are rescaled by certain factors. The solid, dashed, dot‐dashed, and dotted curves represent the results obtained by Equations (3), (5), (10) with

\mu _i=\mu _{\rm B}/3

, and Equation (10) with

\mu _i=0

, respectively.…”

Section: Resultsmentioning

confidence: 99%

An Energy Independent Scaling of Transverse Momentum Spectra of Direct (Prompt) Photons from Two‐Body Processes in High‐Energy Proton–Proton Collisions

et al. 2022

View full text Add to dashboard Cite

Transverse momentum spectra of direct (prompt) photons from two-body processes in high-energy proton-proton (p+p) collisions are analyzed in this paper. The experimental invariant cross-sections are collected at mid-rapidity in p+p collisions measured by the UA6, CCOR, R806, R110, PHENIX, NA24, CMS, ALICE, and ATLAS Collaborations over a center-of-mass energy range from 24.3 GeV to 13 TeV. In fitting the data, different kinds of functions are used which include the revised Tsallis-Pareto-type function (the TP-like function) at the particle level, the convolution of two TP-like functions at the quark level, and the root-sum-of-squares of two revised Tsallis-like functions in which the quark chemical potentials 𝝁 i = 𝝁 B ∕3 or 𝝁 i = 0, where 𝝁 B is the baryon chemical potential. The values of three main free parameters have been extracted: the effective temperature T, power index n 0 (or entropy index q), and correction index a 0 . After analyzing the changing trends of the parameters, it is found that T, q, and a 0 increase and n 0 decreases with the increase of collision energy. Based on the analyses of transverse momentum spectra, an energy independent scaling, that is, the x T scaling, is obtained.

show abstract

“…In the first half of the decade, pioneering measurements have established the existence of a signal and identified backgrounds, the main source being π 0 and η decays sending one of the two decay photons alongside their own momentum. At the end of the decade, clear signals were observed 34,35 and a series of measurements followed, which, together with fixed target data, provided a very successful laboratory for QCD. Once again, hadronic interactions, both on fixed target machines and at the ISR, had made use of their unique ability to study gluon collisions and to give essential contributions to the study of the strong interaction in the QCD perturbative regime.…”

Section: Direct Photonsmentioning

confidence: 99%

Revealing Partons in Hadrons: From the ISR to the SPS Collider

Darriulat¹,

Lella²

2015

Advanced Series on Directions in High Energy Physics

View full text Add to dashboard Cite

Our understanding of the structure of hadrons has developed during the seventies and early eighties from a few vague ideas to a precise theory, Quantum Chromodynamics, that describes hadrons as made of elementary partons (quarks and gluons). Deep inelastic scattering of electrons and neutrinos on nucleons and electron-positron collisions have played a major role in this development. Less well known is the role played by hadron collisions in revealing the parton structure, studying the dynamic of interactions between partons and offering an exclusive laboratory for the direct study of gluon interactions. The present article recalls the decisive contributions made by the CERN Intersecting Storage Rings and, later, the proton-antiproton SPS Collider to this chapter of physics. PreambleIn the mid-sixties, when the ISR were being born, the idea that hadrons could be composite particles was still far from being generally accepted. Summer school lectures were giving as much weight to bootstrap ideas 1 as to the newly born quark model.2 We remember a seminar by C. N. Yang 3 at CERN, just before the ISR first collisions, introducing the concept of limiting fragmentation, which we were religiously listening to in the hope that it could give us an idea of what to expect from our imminent exploration of the high energy territory. In spite of the spectacular success of Gell-Mann's eightfold way, the quark model had to face two very strong counter-arguments: the failure of many quark search experiments to find any hint for fractional charges and the apparent incompatibility of the quark model with Fermi-Dirac statistics. Indeed, we did not know about colour, nor about the peculiar behavior of the strong force to get weaker at short distances. The light would come from SLAC at the very end of the decade, with deep inelastic electron scattering soon followed by SPEAR and its harvest of revolutionary results.If hadrons are composite, it should be possible to understand hadron collisions in terms of interactions and rearrangements of the constituents, the so-called partons, and, in particular, to eject one of them, as in nuclear physics with (p,2p) or (p,pn) reactions. It is indeed possible, but it took a decade to reach this goal. Hadrons are very different from nuclei, which can be qualitatively described classically in

show abstract

Search for direct single-photon production at large pT in photon-proton collisions at √s = 62.4 GeV

Cited by 70 publications

References 35 publications

Measurement of the inclusive isolated prompt photon cross section inppcollisions ats=7 TeVwith the ATLAS detector

Measurement of the inclusive isolated prompt photon cross section inppcollisions ats=7 TeVwith the ATLAS detector

An Energy Independent Scaling of Transverse Momentum Spectra of Direct (Prompt) Photons from Two‐Body Processes in High‐Energy Proton–Proton Collisions

Revealing Partons in Hadrons: From the ISR to the SPS Collider

Contact Info

Product

Resources

About