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  • Hadron Transverse Momentum Distributions in Muon Deep Inelastic Scattering at 160 GeV/$c$
    Publication . COMPASS collaboration (210 authors); Bordalo, P.; Franco, C.; Nunes, A.S.; Quaresma, M.; Quintans, C.; Ramos, S.; Silva, L.; Stolarski, M.
    Multiplicities of charged hadrons produced in deep inelastic muon scattering off a (6)LiD target have been measured as a function of the DIS variables x ( )Bj( ), Q (2), W (2) and the final state hadron variables p ( )T( ) and z. The distributions are fitted with a single exponential function at low values of to determine the dependence of on x ( )Bj( ), Q (2), W (2) and z. The z-dependence of is shown to be a potential tool to extract the average intrinsic transverse momentum squared of partons, , as a function of x ( )Bj( ) and Q (2) in a leading order QCD parton model.
    2013-08-23Journal article Open access Show more
  • Inclusive search for supersymmetry using the razor variables in $pp$ collisions at $\sqrt{s}=7$ TeV
    Publication . CMS collaboration (2197 authors); Hollar, Jonathan; Nayak, Aruna; Almeida, Nuno; Bargassa, Pedrame; David Tinoco Mendes, Andre; Faccioli, Pietro; Ferreira Parracho, Pedro Guilherme; Gallinaro, Michele; Seixas, Joao; Varela, Joao; Vischia, Pietro; Lloret Iglesias, Lara; Musella, Pasquale; Rodrigues Antunes, Joao; Silva, Pedro; Pela, Joao; Leonardo, Nuno
    An inclusive search is presented for new heavy particle pairs produced in $\sqrt{s}$ = 7 TeV proton-proton collisions at the LHC using 4.7 +/- 0.1 inverse femtobarns of integrated luminosity. The selected events are analyzed in the 2D razor space of MR, an event-by-event indicator of the heavy particle mass scale, and R, a dimensionless variable related to the missing transverse energy. The third-generation sector is probed using the event heavy-flavor content. The search is sensitive to generic supersymmetry models with minimal assumptions about the superpartner decay chains. No excess is observed in the number of events beyond that predicted by the standard model. Exclusion limits are derived in the CMSSM framework as well as for simplified models. Within the CMSSM parameter space considered, gluino masses up to 800 GeV and squark masses up to 1.35 TeV are excluded at 95% confidence level depending on the model parameters. The direct production of pairs of stop or sbottom quarks is excluded for masses as high as 400 GeV.
    2013-08-23Journal article Open access Show more