Search for resonant production of strongly coupled dark matter in proton-proton collisions at 13 TeV

Tumasyan, A. and Adam, W. and Andrejkovic, J.W. and Bergauer, T. and Chatterjee, S. and Damanakis, K. and Dragicevic, M. and Escalante, Del Valle A. and Frühwirth, R. and Jeitler, M. and Krammer, N. and Lechner, L. and Liko, D. and Mikulec, I. and Paulitsch, P. and Pitters, F.M. and Schieck, J. and Schöfbeck, R. and Schwarz, D. and Templ, S. and Waltenberger, W. and Wulz, C.-E. and Chekhovsky, V. and Litomin, A. and Makarenko, V. and Darwish, M.R. and De, Wolf E.A. and Janssen, T. and Kello, T. and Lelek, A. and Csanád, Máté and Farkas, Krisztián and Gadallah, Mahmoud Moussa Abdelkhalek and Lökös, Sándor and Major, Péter and Mandal, Koushik and Pásztor, Gabriella and Surányi, Olivér and Veres, Gábor and Bartók, Márton and Bencze, György and Hajdu, Csaba and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Karancsi, János and Molnár, József and Szillási, Zoltán and Teyssier, Daniel and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Csörgő, Tamás and Nemes, Frigyes and Novák, Tamás (2022) Search for resonant production of strongly coupled dark matter in proton-proton collisions at 13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2022 (6). ISSN 1126-6708

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Abstract

The first collider search for dark matter arising from a strongly coupled hidden sector is presented and uses a data sample corresponding to 138 fb−1 , collected with the CMS detector at the CERN LHC, at √ s = 13 TeV. The hidden sector is hypothesized to couple to the standard model (SM) via a heavy leptophobic Z0 mediator produced as a resonance in proton-proton collisions. The mediator decay results in two “semivisible” jets, containing both visible matter and invisible dark matter. The final state therefore includes moderate missing energy aligned with one of the jets, a signature ignored by most dark matter searches. No structure in the dijet transverse mass spectra compatible with the signal is observed. Assuming the Z0 boson has a universal coupling of 0.25 to the SM quarks, an inclusive search, relevant to any model that exhibits this kinematic behavior, excludes mediator masses of 1.5–4.0 TeV at 95% confidence level, depending on the other signal model parameters. To enhance the sensitivity of the search for this particular class of hidden sector models, a boosted decision tree (BDT) is trained using jet substructure variables to distinguish between semivisible jets and SM jets from background processes. When the BDT is employed to identify each jet in the dijet system as semivisible, the mediator mass exclusion increases to 5.1 TeV, for wider ranges of the other signal model parameters. These limits exclude a wide range of strongly coupled hidden sector models for the first time.

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