Measurements of differential and double-differential Drell–Yan cross sections in proton–proton collisions at √s = 8TeV

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Karancsi, János and Molnár, József and Makovec, Alajos and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2015) Measurements of differential and double-differential Drell–Yan cross sections in proton–proton collisions at √s = 8TeV. EUROPEAN PHYSICAL JOURNAL C, 75 (4). ISSN 1434-6044

Preview

Text 1412.1115.pdf Available under License Creative Commons Attribution. Download (1MB) | Preview

Abstract

Measurements of the differential and double-differential Drell–Yan cross sections in the dielectron and dimuon channels are presented. They are based on proton-proton collision data at √s = 8 TeV recorded with the CMS detector at the LHC and cor- responding to an integrated luminosity of 19.7 fb−1. The measured inclusive cross section in the Z peak region (60–120 GeV), obtained from the combination of the di- electron and dimuon channels, is 1138 ± 8 (exp) ± 25 (theo) ± 30 (lumi) pb, where the statistical uncertainty is negligible. The differential cross section dσ/dm in the dilep- ton mass range 15 to 2000 GeV is measured and corrected to the full phase space. The double-differential cross section d2σ/dm d|y| is also measured over the mass range 20 to 1500 GeV and absolute dilepton rapidity from 0 to 2.4. In addition, the ratios of the normalized differential cross sections measured at √s = 7 and 8 TeV are presented. These measurements are compared to the predictions of perturbative QCD at next- to-leading and next-to-next-to-leading (NNLO) orders using various sets of parton distribution functions (PDFs). The results agree with the NNLO theoretical predic- tions computed with FEWZ 3.1 using the CT10 NNLO and NNPDF2.1 NNLO PDFs. The measured double-differential cross section and ratio of normalized differential cross sections are sufficiently precise to constrain the proton PDFs.

Actions (login required)

Edit Item