کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1853607 | 1034297 | 2008 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Measuring gluon shadowing with prompt photons at RHIC and LHC
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The possibility to observe the nuclear modification of the gluon distribution at small-x (gluon shadowing) using high-p⥠prompt photon production at RHIC and at LHC is discussed. The per-nucleon ratio, Ï(p+Aâγ+X)/(AÃÏ(p+pâγ+X)), is computed for both inclusive and isolated prompt photons in perturbative QCD at NLO using different parameterizations of nuclear parton densities, in order to assess the visibility of the shadowing signal. The production of isolated photons turns out to be a promising channel which allows for a reliable extraction of the gluon density, RGA, and the structure function, RF2A, in a nucleus over that in a proton. Moreover, the production ratio of prompt photons at forward-over-backward rapidity in p-A collisions provides an estimate of RGA (at small x) over RF2A (at large x), without the need of p-p reference data at the same energy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 660, Issue 3, 21 February 2008, Pages 181-187
Journal: Physics Letters B - Volume 660, Issue 3, 21 February 2008, Pages 181-187
نویسندگان
François Arleo, Thierry Gousset,