Study Of Direct Single Photons And Correlated Particles In Proton Proton Collisions At Sqrt S PDF Download

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Study of Direct Single Photons and Correlated Particles in Proton-proton Collisions At. Sqrt. S

Study of Direct Single Photons and Correlated Particles in Proton-proton Collisions At. Sqrt. S
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Release: 1980
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As part of a study of large p/sub T/ phenomena in proton-proton collisions at the CERN ISR, a search for direct single photon production has been performed. A statistical division of the data sample into the fraction consistent with single photon production and the fraction due to multiphoton decays of neutral hadrons is accomplished by measuring the average conversion probability for the sample in a one radiation length thick converter. The fraction of the sample attributable to direct single photon production is .gamma./all = 0.074 +- 0.012 for 6 GeV/c = 0.26 +- 0.04 for p/sub T/> 10 GeV/c, with an additional systematic uncertainty of +- 0.05 for both values. It is found that single photons are produced preferentially with no accompanying particles on the same side. The ratio of positive to negative particles on the away side is found to be 3.7 +- 1.2 at high x/sub E/ and p/sub T/ for the single photon events.

Study of Double Parton Scattering in Photon + 3 Jets Final State

Study of Double Parton Scattering in Photon + 3 Jets Final State
Author: You-Hao Chang
Publisher: Springer
Total Pages: 107
Release: 2017-01-20
Genre: Science
ISBN: 9811038244
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This book mainly focuses on the study of photon + 3 jets final state in Proton-Proton Collisions at √s = 7TeV, searching for patterns of two (or more) distinct hard scatterings in the same collision, i.e the so-called Double Parton Scattering (DPS). A new method by using Monte Carlo generators was performed and provides higher order corrections to the description of the Single Parton Scattering (SPS) background. Further it is investigated whether additional contributions from DPS can improve the agreement between the measured data and the Monte Carlo predictions. The current theoretical uncertainties related to the SPS background are found to be larger than expectation. At the same time a rich set of DPS-sensitive measurements is reported for possible further interpretation.

Direct Photon Center-of-Mass Angular Distributions in $p\bar{p}$ Collisions at $\sqrt{s}$

Direct Photon Center-of-Mass Angular Distributions in $p\bar{p}$ Collisions at $\sqrt{s}$
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Total Pages: 183
Release: 1992
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The center-of-mass angular distribution of direct photon events, resulting from proton-antiproton collisions at a center-of-mass energy of 1.8 TeV, as measured by the Collider Detector at Fermi lab (CDF) during the 1988-1089 experimental run, is presented. The direct photon events are identified primarily through the direct photon's characteristic isolation from other particles. The main source of background is from rare fragmentation of QCD partons into single isolated neutral mesons, which decay into two or more photons. The background is removed statistically by exploitation of tile expected difference in the resulting shower profiles. The resulting angular distribution for direct photons, in the transverse momentum range from 22 to 45 Ge V is found to agree favorably with the predictions of Quantum Cbromodynamics (QCD) for an interaction with a fermion (spin 1/2) propagator.

Government Reports Annual Index

Government Reports Annual Index
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Total Pages: 1060
Release: 1988
Genre: Government reports announcements & index
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Single-particle Production and Photon-hadron Correlations in P + P Collisions at Next-to-leading Order

Single-particle Production and Photon-hadron Correlations in P + P Collisions at Next-to-leading Order
Author: Jonathan Coull
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Total Pages:
Release: 2011
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In this thesis, we study photon production and photon-hadron correlations at next-to-leading order (NLO) in proton-proton collisions, in both the cases of isolated and non-isolated photons. To begin, fundamentals of perturbative Quantum Chromodynamics (pQCD) are reviewed, with an emphasis on describing how to compute spectra for single particle production and correlated pairs at both leading order (LO) and NLO in hadronic collisions. In particular, a discussion of infrared and collinear singularities at NLO will provide a natural introduction to the concept of factorization. These results are then specifically applied to the case of computing photon and pion single-particle cross-sections in proton-proton collisions at Relativistic Heavy-Ion Collider (RHIC) and Large Hadron Collider(LHC) energies, and compared to experimental data from the PHENIX and CMS experiments respectively. Included in this will be a short study of the theoretical systematic uncertainty ...