Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at sqrt(s) = 13 TeV - INSPIRE

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Search for dark matter and unparticles in events with a Z boson and missing transverse momentum in proton-proton collisions at sqrt(s) = 13 TeV

CMS

Collaboration

2016

25 pages

Report number:

CMS-PAS-EXO-16-010

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Citations per year

Abstract:

A search for evidence of dark matter (DM) and unparticle production at the LHC has been performed using events containing two charged leptons, consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector corresponding to an integrated luminosity of 2.3 fb

^{-1}

of pp collisions at the LHC at a center-of-mass energy of 13 TeV. No excess over the standard model expectation is observed. The results are interpreted in terms of a simplified model of DM production. For both vector and axial vector couplings between a mediator and DM particles, 95\% confidence level limits are set on the observed signal strength in the plane of mediator and DM particle mass. Additionally, 90\% confidence level limits are set on the DM-nucleon scattering cross section, as a function of the DM particle mass, for both spin-dependent and spin-independent coupling scenarios. In the context of an effective field theory, 95\% confidence level limits are set on the DM coupling parameters to

U(1)

and

SU(2)

gauge fields and on the scale of new physics. Additionally, 95\% confidence level limits are obtained on the unparticle model parameters.

Note:

Preliminary results

Data
p p: colliding beams
transverse momentum: missing-energy
p p: scattering
dark matter: pair production
dark matter: coupling
coupling: axial-vector
unparticle: production
scale: new physics
Z0: leptonic decay

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