A1 Journal article (refereed), original research

Searches for physics beyond the standard model with the MT2 variable in hadronic final states with and without disappearing tracks in proton-proton collisions at √s = 13 TeV

Open Access publication

Publication Details
Authors: Tuuva Tuure, Sirunyan Albert, Tumasyan Armen, Adam Wolfgang, Ambrogi Federico, Bergauer Thomas, Brandstetter Johannes, Dragicevic Marko, Erö Janos, Escalante Del Valle Alberto, Flechl Martin, Fruehwirth Rudolf,
Jeitler Manfred, Krammer Natascha, Krätschmer Ilse, Liko Dietrich, Madlener Thomas, Mikulec Ivan, Rad Navid, CMS Collaboration

Publisher: Springer Verlag (Germany): SCOAP3 / Springer Verlag (Germany)
Publication year: 2020
Language: English
Related Journal or Series Information: European Physical Journal C: Particles and Fields
Volume number: 80
Issue number: 1
ISSN: 1434-6044
eISSN: 1434-6052
JUFO-Level of this publication: 2
Open Access: Open Access publication


Two related searches for phenomena beyond the standard model (BSM) are performed using events with hadronic jets and significant transverse momentum imbalance. The results are based on a sample of proton–proton collisions at a center-of-mass energy of (13, ext {Te} ext {V} ), collected by the CMS experiment at the LHC in 2016–2018 and corresponding to an integrated luminosity of 137(, ext {fb}^{-1}). The first search is inclusive, based on signal regions defined by the hadronic energy in the event, the jet multiplicity, the number of jets identified as originating from bottom quarks, and the value of the kinematic variable (M_{mathrm {T2}}) for events with at least two jets. For events with exactly one jet, the transverse momentum of the jet is used instead. The second search looks in addition for disappearing tracks produced by BSM long-lived charged particles that decay within the volume of the tracking detector. No excess event yield is observed above the predicted standard model background. This is used to constrain a range of BSM models that predict the following: the pair production of gluinos and squarks in the context of supersymmetry models conserving R-parity, with or without intermediate long-lived charginos produced in the decay chain; the resonant production of a colored scalar state decaying to a massive Dirac fermion and a quark; or the pair production of scalar and vector leptoquarks each decaying to a neutrino and a top, bottom, or light-flavor quark. In most of the cases, the results obtained are the most stringent constraints to date.

Last updated on 2020-23-03 at 12:10