Yazar
Sirunyan, A. M., Işıldak, Bora
Basım Tarihi
2017
Basım Yeri
-
Springer International Publishing
Tür
Süreli Yayın
Dil
İngilizce
Dijital
Evet
Yazma
Hayır
Kütüphane
Özyeğin Üniversitesi
Demirbaş Numarası
1434-6044
Kayıt Numarası
8dae6425-dbf4-4d83-af7b-8ca8288cf361
Lokasyon
Natural and Mathematical Sciences
Tarih
2017
Notlar
Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Örnek Metin
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
