9 research outputs found

    Pseudorapidity distribution of charged hadrons in proton-proton collisions at root s=13TeV

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    Production of leading charged particles and leading charged-particle jets at small transverse momenta in pp collisions at √s =8 TeV

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    The per-event yield of the highest transverse momentum charged particle and charged-particle jet, integrated above a given p min T threshold starting at p min T =0.8 and 1 GeV, respectively, is studied in pp collisions at s √ =8  TeV . The particles and the jets are measured in the pseudorapidity ranges |η|<2.4 and 1.9, respectively. The data are sensitive to the momentum scale at which parton densities saturate in the proton, to multiple partonic interactions, and to other key aspects of the transition between the soft and hard QCD regimes in hadronic collision

    Evidence for exclusive γγ → W+ W− production and constraints on anomalous quartic gauge couplings in pp collisions at √s = 7 and 8 TeV

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    Azimuthal decorrelation of jets widely separated in rapidity in pp collisions at √s = 7 TeV

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    Pseudorapidity distribution of charged hadrons in proton-proton collisions at s=13 TeV

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    The pseudorapidity distribution of charged hadrons in pp collisions at s=13 TeV is measured using a data sample obtained with the CMS detector, operated at zero magnetic field, at the CERN LHC. The yield of primary charged long-lived hadrons produced in inelastic pp collisions is determined in the central region of the CMS pixel detector (|η|&lt;2) using both hit pairs and reconstructed tracks. For central pseudorapidities (|η|&lt;0.5), the charged-hadron multiplicity density is dNch/dη||η|&lt;0.5=5.49±0.01(stat)±0.17(syst), a value obtained by combining the two methods. The result is compared to predictions from Monte Carlo event generators and to similar measurements made at lower collision energies. © 2015 CERN for the benefit of the CMS Collaboration

    Erratum to: Measurement of exclusive ΄ photoproduction from protons in pPb collisions at s NN = 5.02 TeV (The European Physical Journal C, (2019), 79, 3, (277), 10.1140/epjc/s10052-019-6774-8)

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    In this article the author name Luigi Calligaris was incorrectly written as A. Calligaris. The original article has been corrected. © CERN for the benefit of the CMS collaboration 2022

    Measurement of long-range near-side two-particle angular correlations in pp collisions at sqrt(s) = 13 TeV

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    Submitted to Phys. Rev. Lett, see paper for full list of authorsInternational audienceResults on two-particle angular correlations for charged particles produced in pp collisions at a center-of-mass energy of 13 TeV are presented. The data were taken with the CMS detector at the LHC and correspond to an integrated luminosity of about 270 inverse nanobarns. The correlations are studied over a broad range of pseudorapidity (abs(eta)2.0), near-side (Delta phi ~ 0) structure emerges in the two-particle Delta eta-Delta phi correlation functions. The magnitude of the correlation exhibits a pronounced maximum in the range 1.0<pt<2.0GeV/c and an approximately linear increase with the charged particle multiplicity. The overall correlation strength at sqrt(s) = 13 TeV is similar to that found in earlier pp data at sqrt(s) = 7 TeV, but is measured up to much higher multiplicity values. The observed long-range correlations are compared to those seen in pp, pPb, and PbPb collisions at lower collision energies

    Measurement of inclusive very forward jet cross sections in proton-lead collisions at √sNN = 5.02 TeV

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