Searches for new phenomena in events with jets and high values of the $M_{\mathrm{T2}}$ variable, including signatures with disappearing tracks, in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ - INSPIRE

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Searches for new phenomena in events with jets and high values of the $M_{\mathrm{T2}}$ variable, including signatures with disappearing tracks, in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

CMS

Collaboration

2019

Report number:

CMS-PAS-SUS-19-005

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

reference search25 citations

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Abstract:

Searches for new phenomena are performed using events with jets and significant transverse momentum imbalance. In events with at least two jets, the transverse momentum imbalance is inferred through the

M_{\mathrm{T2}}

variable. The results are based on a sample of proton-proton collisions collected with the CMS detector during the LHC Run II (2016-2018) and correspond to an integrated luminosity of

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

taken at a center-of-mass energy of

13~\mathrm{TeV}

. Two related searches are performed. The first is an inclusive search 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

M_{\mathrm{T2}}

for events with at least two jets, or the tranverse momentum of the jet for events with just one jet. The second is a search for disappearing tracks produced by new long-lived charged particles, decaying within the volume of the CMS tracking detector. No excess event yield is observed above the predicted standard model background, leading to exclusion limits on pair-produced gluinos and squarks in simplified models of

R

-parity conserving supersymmetry. Mass limits as high as

2250~\mathrm{GeV}

,

1770~\mathrm{GeV}

,

1260~\mathrm{GeV}

and

1225~\mathrm{GeV}

are obtained from the inclusive

M_{\mathrm{T2}}

search for gluinos, light-flavor squarks, bottom squarks and top squarks, respectively. The search for disappearing tracks extends the gluino mass limit to as much as

2460~\mathrm{GeV}

, and the

\tilde{\chi}^{0}_{1}

mass limit to as much as

2000~\mathrm{GeV}

, in models where the gluino can decay with equal probability to

\tilde{\chi}^{0}_{1}

,

\tilde{\chi}^{+}_{1}

, and

\tilde{\chi}^{-}_{1}

, and the

\tilde{\chi}^{\pm}_{1}

are long-lived.

Note:

Preliminary results

Monte-Carlo
p p: scattering
p p: colliding beams
new physics: search for
jet: multiplicity
jet: momentum
gluino: mass: lower limit
supersymmetry: conservation law
charged particle: long-lived
energy: hadronic

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