Paolo Verrecchia

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A search for narrow resonances in the dijet mass spectrum is performed using data corresponding to an integrated luminosity of 2.9 pb⁻¹ collected by the CMS experiment at the Large Hadron Collider. Upper limits at the 95% confidence level are presented on the product of the resonance cross section, branching fraction into dijets, and acceptance, separately(More)
At the electron-proton collider HERA the inclusive D meson photoproduc-tion cross section has been measured with the H1 detector in two diierent, but partly overlapping, kinematical regions. For the rst, where hW p i 200 GeV and Q 2 < 0:01 GeV 2 , the result is (p ! c cX) ?7:2) b at hW p i 230GeV, respectively. The third error accounts for an additional(More)
Photoproduction of 2-jet events is studied with the H1 detector at HERA. Parton cross sections are extracted from the data by an unfolding method using leading order parton-jet correlations of a QCD generator. The gluon distribution in the photon is derived in the fractional momentum range 0:04 x 1 at the average factorization scale 75 GeV 2. H1(More)
Measurements of ep scattering with squared 4{momentum transfer Q 2 up to 35000 GeV 2 are compared with the expectation of the standard deep-inelastic model of lepton{nucleon scattering (DIS). For Q 2 > 15000 GeV 2 , N obs = 12 neutral current candidate events are observed where the expectation is N DIS = 4:71 0:76 events. In the same Q 2 range, N obs = 4(More)
Cross sections are presented for the inclusive production of charged particles measured in electron-proton collisions at low Q 2 with the H1 detector at HERA. The transverse momentum distribution extends up to 8 GeV/c. Its shape is found to be harder than that observed in pp collisions at comparable centre-of-mass energies p s p p s pp 200 GeV, and also(More)
Citation CMS Collaboration et al. " Transverse-momentum and Pseudorapidity Distributions of Charged Hadrons in Pp Collisions at $\sqrt{s} = 0.9 $ and 2.36 TeV. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Transverse-momentum and pseudorapidity distributions of charged hadrons in pp(More)
A search for quark compositeness in the form of quark contact interactions, based on hadronic jet pairs (dijets) produced in proton-proton collisions at √s=7 TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9 pb(-1) collected with the CMS detector at the LHC. The dijet centrality ratio, which quantifies the(More)
The total cross sections for the elastic electroproduction of % and J== mesons for Q 2 > 8 GeV 2 and hWi ' 90 GeV=c 2 are measured at HERA with the H1 detector. The measurements are for an integrated electron?proton luminosity of ' 3 pb ?1. The dependences of the total virtual photon?proton (p) cross sections on Q 2 , W and the momentum transfer squared to(More)
We present a search for excited electrons, neutrinos and quarks using the H1 detector at the ep collider HERA, based on data taken in 1994 with an integrated luminosity of 2.75 pb ?1. Radiative decays of excited quarks and neutrinos have been investigated as well as decays of excited electrons into all possible electroweak gauge bosons. No evidence for new(More)