Search for dark matter in association with a $\mathrm{t\overline{t}}$ pair at $\sqrt{s}=13~\mathrm{TeV}$ in the dilepton channel with 2016 data - INSPIRE

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Search for dark matter in association with a $\mathrm{t\overline{t}}$ pair at $\sqrt{s}=13~\mathrm{TeV}$ in the dilepton channel with 2016 data

CMS

Collaboration

2018

Report number:

CMS-PAS-EXO-17-014

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Abstract:

A search is performed for dark matter produced in association with

\mathrm{t\overline{t}}

pairs in data from proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC. The data corresponds to

35.9~\mathrm{fb}^{-1}

collected with the CMS detector in 2016. The analysis looks for an excess of events with large imbalance in transverse momentum and a top quark pair decaying in the dileptonic mode. The results are interpreted in the context of simplified models of dark matter production. Assuming unitary coupling values to standard model (SM) particles

g_{\text{q}}

, and dark matter (DM) particles

g_{\chi}

, and DM mass

m_{\chi} = 1~\mathrm{GeV}

, the observed (expected)

95\%

CL exclusions for a scalar mediator are

m_{\phi} < 74\:(99)~\mathrm{GeV}

. The

95\%

CL exclusion expected for a pseudoscalar mediator is

m_{a} < 50~\mathrm{GeV}

, while none is observed.

Note:

Preliminary results

Data
p p: colliding beams
top: pair production
dark matter: associated production
dark matter: mass
p p: scattering
mediation
transverse momentum: missing-energy
top: leptonic decay
CERN LHC Coll

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