C. Rogan

Measurement of the Y(1S), Y(2S), and Y(3S) polarizations in pp collisions at sqrt(s) = 7 TeV

The polarizations of the Υ(1S), Υ(2S), and Υ(3S) mesons are measured in protonproton collisions at √ s = 7 TeV, using a data sample of Υ(nS) → μ+μ− decays collected by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb−1. The dimuon decay angular distributions are analyzed in three different polarization frames. The polarization parameters λθ, λφ, and λθφ, as well as the frame-invariant quantity λ̃, are presented as a function of the Υ(nS) transverse momentum between 10 and 50 GeV, in the rapidity ranges |y| < 0.6 and 0.6 < |y| < 1.2. No evidence of large transverse or longitudinal polarizations is seen in the explored kinematic region. Submitted to Physical Review Letters c

Measurements of inclusive W and Z cross sections in pp collisions at √s=7 TeV

Measurements of inclusive W and Z boson production cross sections in pp collisions at sqrt(s)=7 TeV are presented, based on 2.9 inverse picobarns of data recorded by the CMS detector at the LHC. The measurements, performed in the electron and muon decay channels, are combined to give sigma(pp to WX) times B(W to muon or electron + neutrino) = 9.95 \pm 0.07(stat.) \pm 0.28(syst.) \pm 1.09(lumi.) nb and sigma(pp to ZX) times B(Z to oppositely charged muon or electron pairs) = 0.931 \pm 0.026(stat.) \pm 0.023(syst.) \pm 0.102(lumi.) nb. Theoretical predictions, calculated at the next-to-next-to-leading order in QCD using recent parton distribution functions, are in agreement with the measured cross sections. Ratios of cross sections, which incur an experimental systematic uncertainty of less than 4%, are also reported.Measurements of inclusive W and Z boson production cross sections in pp collisions at

Transverse-Momentum and Pseudorapidity Distributions of Charged Hadrons in pp Collisions at s√=7 TeV

\sqrt {s} = 7

Measurement of the differential cross section for top quark pair production in pp collisions at s√=8TeV

TeV are presented, based on 2.9 pb−1 of data recorded by the CMS detector at the LHC. The measurements, performed in the electron and muon decay channels, are combined to give

Search for heavy Majorana neutrinos in μ±μ±+jets and e±e±+jets events in pp collisions at √s =7 TeV

\sigma \left( {{\text{pp}} \to {\text{W}}X} \right) \times \mathcal{B}\left( {{\text{W}} \to \ell \nu } \right) = 9.95\pm 0.07\left( {{\text{stat}}{.}} \right)\pm 0.28\left( {{\text{syst}}{.}} \right)\pm 1.09

Search for neutral Higgs bosons decaying to tau pairs in pp collisions at √s=7 TeV

(lumi.) nb and

Dijet Azimuthal Decorrelations in pp Collisions at √[s]=7 TeV

\sigma \left( {{\text{pp}} \to {\text{Z}}X} \right) \times \mathcal{B}\left( {Z \to {\ell^{+} }{\ell^{-} }} \right) = 0.931\pm 0.026\left( {{\text{stat}}{.}} \right)\pm 0.023\left( {{\text{syst}}{.}} \right)\pm 0.102

Search for anomalous tt production in the highly-boosted all-hadronic final state

(lumi.) nb, where ℓ stands for either e or μ. Theoretical predictions, calculated at the next-to-next-to-leading order in QCD using recent parton distribution functions, are in agreement with the measured cross sections. Ratios of cross sections, which incur an experimental systematic uncertainty of less than 4%, are also reported.40 paginas, 8 figuras, 5 tablas.-- Open Access: This article is distributed under the terms of the Creative Commons Attribution Noncommercial License.-- CMS Collaboration: et al.

J/ψ and ψ (2S) production in pp collisions at √s=7Tev

Charged-hadron transverse-momentum and pseudorapidity distributions in protonproton collisions at √ s = 7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit-pairs, and fully reconstructed chargedparticle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dNch/dη||η|<0.5 = 5.78 ± 0.01 (stat.) ± 0.23 (syst.) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from √ s = 0.9 to 7 TeV is (66.1± 1.0 (stat.)± 4.2 (syst.))%. The mean transverse momentum is measured to be 0.545 ± 0.005 (stat.) ± 0.015 (syst.) GeV/c. The results are compared with similar measurements at lower energies. Published in Physical Review Letters ∗See Appendix A for the list of collaboration members ar X iv :1 00 5. 32 99 v2 [ he pex ] 6 J ul 2 01 0

Measurements of tt¯ spin correlations and top quark polarization using dilepton final states in pp collisions at √s=8 TeV

The normalized differential cross section for top quark pair (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}