کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8186671 | 1528776 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The ratio Râ¯=â¯dÏL/dÏT in heavy-quark pair leptoproduction as a probe of linearly polarized gluons in unpolarized proton
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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 study the Callan-Gross ratio R=dÏL/dÏT in heavy-quark pair leptoproduction, lNâlâ²QQ¯X, as a probe of linearly polarized gluons inside unpolarized proton, where dÏT (dÏL) is the differential cross section of the γâNâQQ¯X process initiated by a transverse (longitudinal) virtual photon. Note first that the maximal value for the quantity R allowed by the photon-gluon fusion with unpolarized gluons is large, about 2. We calculate the contribution of the transverse-momentum dependent gluonic counterpart of the Boer-Mulders function, h1â¥g, describing the linear polarization of gluons inside unpolarized proton. Our analysis shows that the maximum value of the ratio R depends strongly on the gluon polarization; it varies from 0 to Q24m2 depending on h1â¥g. We conclude that the Callan-Gross ratio in heavy-quark pair leptoproduction is predicted to be large and very sensitive to the contribution of linearly polarized gluons. For this reason, future measurements of the longitudinal and transverse components of the charm and bottom production cross sections at the proposed EIC and LHeC colliders seem to be very promising for determination of the linear polarization of gluons inside unpolarized proton.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 780, 10 May 2018, Pages 303-307
Journal: Physics Letters B - Volume 780, 10 May 2018, Pages 303-307
نویسندگان
A.V. Efremov, N.Ya. Ivanov, O.V. Teryaev,