نویسنده
Sirunyan, A. M., Işıldak, Bora
تاریخ انتشار
2017
محل انتشار
-
Springer International Publishing
نوع
دوره ای
زبان
انگلیسی
دیجیتال
بله
نسخه خطی
خیر
کتابخانه
دانشگاه اوزیغین
شناسه دارایی کتابخانه
1434-6044
شماره ثبت
8dae6425-dbf4-4d83-af7b-8ca8288cf361
محل کتابخانه
Natural and Mathematical Sciences
تاریخ
2017
یادداشتها
Due to copyright restrictions, the access to the full text of this article is only available via subscription.
متن نمونه
Normalized double-differential cross sections for top quark pair ( tt¯tt¯ ) production are measured in pp collisions at a centre-of-mass energy of 8 TeVTeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7 fb−1fb−1 . The measurement is performed in the dilepton e±μ∓e±μ∓ final state. The tt¯tt¯ cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and tt¯tt¯ system. The data are compared to calculations using perturbative quantum chromodynamics at next-to-leading and approximate next-to-next-to-leading orders. They are also compared to predictions of Monte Carlo event generators that complement fixed-order computations with parton showers, hadronization, and multiple-parton interactions. Overall agreement is observed with the predictions, which is improved when the latest global sets of proton parton distribution functions are used. The inclusion of the measured tt¯tt¯ cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.
DOI
10.1140/epjc/s10052-017-4984-5
Cilt
77
