کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5494688 | 1528784 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
QCD predictions for the azimuthal asymmetry in charm leptoproduction for the COMPASS kinematics
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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
We present the QCD predictions for the azimuthal cosâ¡2Ï asymmetry in charm leptoproduction for the kinematics of the COMPASS experiment at CERN. The asymmetry is predicted to be large, about 15%. The radiative corrections to the QCD predictions for the cosâ¡2Ï distribution are estimated to be small, less than 10%. Our calculations show that the azimuthal asymmetry in charm production is well defined in pQCD: it is stable both perturbatively and parametrically, and practically insensitive to theoretical uncertainties in the input parameters. We analyze the nonperturbative contributions to the cosâ¡2Ï distribution due to the gluon transverse motion in the target and the c-quark fragmentation. Because of the c-quark low mass, the nonperturbative contributions are expected to be sizable, about (30-40)%. We conclude that extraction of the azimuthal asymmetries from available COMPASS data will provide valuable information about the transverse momentum dependent distribution of the gluon in the proton and the c-quark hadronization mechanism. Finally, we discuss the cosâ¡2Ï asymmetry as a probe of the gluonic analogue of the Boer-Mulders function, h1â¥g, describing the linear polarization of gluons inside unpolarized proton.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 772, 10 September 2017, Pages 283-289
Journal: Physics Letters B - Volume 772, 10 September 2017, Pages 283-289
نویسندگان
A.V. Efremov, N.Ya. Ivanov, O.V. Teryaev,