Updated search for long-lived particles decaying to jet pairs
R. Aaij (European Organization for Nuclear Research (CERN), 0000 0001 2156 142X, Geneva, Switzerland); B. Adeva (Universidad de Santiago de Compostela, 0000000109410645, Santiago de Compostela, Spain); M. Adinolfi (H.H. Wills Physics Laboratory, University of Bristol, 0000 0004 1936 7603, Bristol, UK); Z. Ajaltouni (Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, 0000 0004 0623 3622, Clermont-Ferrand, France); S. Akar (University of Cincinnati, 0000 0001 2179 9593, Cincinnati, OH, USA); et al - Show all 773 authors
A search is presented for long-lived particles with a mass between 25 and 50 GeV/c2 and a lifetime between 2 and 500 ps, using protonâproton collision data corresponding to an integrated luminosity of 2.0 fb-1 , collected by the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The particles are assumed to be pair-produced in the decay of a 125 GeV/c2 Standard-Model-like Higgs boson. The experimental signature is a single long-lived particle, identified by a displaced vertex with two associated jets. No excess above background is observed and limits are set on the production cross-section as a function of the mass and lifetime of the long-lived particle.