331 research outputs found

    Multi-differential measurement of the dijet cross section in proton-proton collisions at s=13‚ÄČTeV\sqrt{s} = 13\,TeV

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    A measurement of the dijet production cross section is reported based on an integrated luminosity of 36.3¬†fb‚ąí136.3\ fb^{-1} of proton-proton collision data collected in 2016 at s=13¬†TeV\sqrt{s} = 13\ TeV by the CMS detector at the CERN LHC. Jets are reconstructed with the anti-kT algorithm for distance parameters of R=0.4R = 0.4 and R=0.8R = 0.8 and differential cross sections are measured as a function of the kinematic properties of the two jets with largest transverse momenta pTp_T. Double-differential (2D) measurements are presented as a function of the largest absolute rapidity ymaxy_{max} of the two jets and the dijet invariant mass m1,2m_{1,2}. Triple-differential (3D) measurements are presented as a function of the dijet rapidity separation y‚ąóy* , the total boost yby_b of the dijet system, and either m1,2m_{1,2} or the average dijet transverse momentum ‚ü®pT‚ü©1,2\langle p_T\rangle_{1,2} as the third variable. The measured cross sections are unfolded to correct for detector effects and are compared with fixed-order calculations derived at next-to-next-to-leading order in perturbative quantum chromodynamics. The impact of the 2D and 3D measurements is investigated on the determination of the parton distribution functions (PDFs) and the strong coupling constant (őĪS\alpha_S), with the inclusion of the 3D cross sections yielding the more precise value of őĪS(mZ)=0.1201¬Ī0.0020\alpha_S(m_Z) = 0.1201 \pm 0.0020

    Measurement of the double-differential inclusive jet cross section in proton-proton collisions at s\sqrt{s} = 5.02 TeV

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    International audienceThe inclusive jet cross section is measured as a function of jet transverse momentum pTp_\mathrm{T} and rapidity yy. The measurement is performed using proton-proton collision data at s\sqrt{s} = 5.02 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 27.4 pb‚ąí1^{-1}. The jets are reconstructed with the anti-kTk_\mathrm{T} algorithm using a distance parameter of RR = 0.4, within the rapidity interval ‚ą£y‚ą£\lvert y\rvert<\lt 2, and across the kinematic range 0.06 <\ltpTp_\mathrm{T}<\lt 1 TeV. The jet cross section is unfolded from detector to particle level using the determined jet response and resolution. The results are compared to predictions of perturbative quantum chromodynamics, calculated at both next-to-leading order and next-to-next-to-leading order. The predictions are corrected for nonperturbative effects, and presented for a variety of parton distribution functions and choices of the renormalization/factorization scales and the strong coupling őĪS\alpha_\mathrm{S}

    Search for stealth supersymmetry in final states with two photons, jets, and low missing transverse momentum in proton-proton collisions at s\sqrt{s} = 13 TeV