Observation of (tt)over-barH Production

Sirunyan, A.M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Asilar, E. and Bartók, Márton and Csanád, Máté and Filipovic, Nicolas and Nagy, Márton and Pásztor, Gabriella and Surányi, Olivér and Veres, Gábor and Bencze, György and Hajdú, Csaba and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Béni, Noémi Tekla and Karancsi, János and Makovec, Alajos and Molnár, József and Szillási, Zoltán and Trócsányi, Zoltán and Ujvári, Balázs (2018) Observation of (tt)over-barH Production. PHYSICAL REVIEW LETTERS, 120 (23). ISSN 0031-9007

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Abstract

A first search for same-sign WW production via double-parton scattering is performed based on proton-proton collision data at a center-of-mass energy of 8 TeV using dimuon and electron-muon final states. The search is based on the analysis of data corresponding to an integrated luminosity of 19.7 fb$^{-1}$. No significant excess of events is observed above the expected single-parton scattering yields. A 95% confidence level upper limit of 0.32 pb is set on the inclusive cross section for same-sign WW production via the double-parton scattering process. This upper limit is used to place a 95% confidence level lower limit of 12.2 mb on the effective double-parton cross section parameter, closely related to the transverse distribution of partons in the proton. This limit on the effective cross section is consistent with previous measurements as well as with Monte Carlo event generator predictions.

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