Neutral Pion and Direct Photon Production in the SPS Energy Regime PDF Download
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Author: Christoph Baumann
Publisher:
ISBN:
Category :
Languages : en
Pages : 180
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Book Description
Author: Christoph Baumann
Publisher:
ISBN:
Category :
Languages : en
Pages : 180
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Book Description
Author:
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ISBN:
Category :
Languages : en
Pages :
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Measurement of neutral pions and direct photons are closely connected experimentally, on the other hand they probe quite different aspects of relativistic heavy ion collisions. In this short review of the [pi]° results from the PHENIX experiment at RHIC our focus is on the [phi]-integrated nuclear modification factor, its energy and system size dependence, and the impact of these results on parton energy loss models. We also discuss the current status of high p{sub T} and thermal direct photon measurements both in p+p and Au+Au collisions. Recognizing the advantages of measuring not only the 'signal', but also all the 'references' needed for proper interpretation in the same experiments (with same or similar systematics) we argue that RHIC should regularly include d+A and even d+d collisions into its system size and energy scan.
Author: How-sen Wong
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 42
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Author: Mark Mitsuo Ito
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Category : Photons
Languages : en
Pages : 310
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Author: Oliver Zaudtke
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ISBN:
Category :
Languages : en
Pages : 238
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Author:
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Category :
Languages : en
Pages : 13
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We report the first inclusive photon measurements about mid-rapidity (
Author: Richard Madey
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Category : Photonuclear reactions
Languages : en
Pages : 64
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Author:
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Category :
Languages : en
Pages :
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We have obtained data for the[gamma]p[yields][pi][sup 0][pi][sup 0] reaction with the CLAS at Jefferson Lab for photon energies 0.4
Author:
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Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 189
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The Jefferson Lab Hall B PrimEx Collaboration is using tagged photons to perform a 1.4% level measurement of the absolute cross section for the photo-production of neutral pions in the Coulomb field of a nucleus as a test of Chiral Perturbation Theory. Such a high precision pushes the limits of the photon tagging technique in regards to the determination of the absolute photon flux. A multifaceted approach to this problem has included measuring the absolute tagging ratios with a Total Absorption Counter (TAC) as well as relative tagging ratios with a Pair Spectrometer (PS), and determining the rate of the tagging counters using multi-hit TDC's and a clock trigger. This enables the determination of the absolute tagged photon flux for the PrimEx experiment with uncertainty of ̃1.0%, which is unprecedented. In view of the stringent constraints on the required precision of the photon flux for this experiment, periodicmeasurements of the pair production cross section were performed throughout the run. In these measurements, both the photon energy and flux were determined by the Jefferson Lab Hall B tagger, and the electron-positron pairs were swept by a magnetic field and detected in the new 1728 channel hybrid calorimeter (HyCal). The pair production crosssection was extracted with an uncertainty of ̃2%, producing an agreement with theoretical calculations at the level of ̃2%. This measurement provided a unique opportunity to verify the photon flux determination procedure for the PrimEx experiment.
