Dresden 2013 – scientific programme

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T: Fachverband Teilchenphysik

T 26: QCD 1

T 26.1: Talk

Monday, March 4, 2013, 11:00–11:15, GER-037

Measurement of double parton scattering in a 4-jet scenario at the CMS experiment — •Paolo Gunnellini and Hannes Jung — Deutsches Elektronen Synchrotronen

Due to the large parton density in proton-proton collisions at the LHC, the probability of having more than one parton interaction per event is non-negligible. In particular, double parton scattering (DPS), an interaction where each proton has two active partons giving rise to two different subprocesses, is relevant. These additional interactions may reach a hard scale comparable to the primary scattering and become experimentally distinguishable at high energies. In an interaction with DPS, pairs of jets are expected to exhibit specific angular and momentum distributions that reflect the uncorrelated nature of the pairs. In a channel with two b-jets and two light- jets in the final state, the b-tag assures a clear association of jets from the same subprocess. We present a preliminary measurement, performed with the CMS experiment at the LHC, of observables to discriminate single and double parton scattering.