Search for heavy neutrinos and third-generation leptoquarks in final states with two hadronically decaying $\tau$ leptons and two jets in proton-proton collisions at $\sqrt{s} = 13~\mathrm{TeV}$

Search for heavy neutrinos and third-generation leptoquarks in final states with two hadronically decaying $\tau$ leptons and two jets in proton-proton collisions at $\sqrt{s} = 13~\mathrm{TeV}$

CMS

Collaboration

2018

Report number:

CMS-PAS-EXO-17-016

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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reference search11 citations

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Abstract:

A search for new particles has been conducted using events with two high transverse momentum (

p_{\textrm{T}}

)

\tau

leptons that decay hadronically, at least two high-

p_{\textrm{T}}

jets, and missing transverse momentum from the

\tau

lepton decays. The analysis is performed using data from proton-proton collisions, collected by the CMS experiment at the LHC in 2016 at

\sqrt{s} = 13~\mathrm{TeV}

, corresponding to an integrated luminosity of

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

. The observed data are consistent with the standard model expectation. The results are interpreted with two physics models. The first model involves right-handed charged bosons,

\textrm{W}_\mathrm{R}

, that decay to heavy right-handed neutrinos,

N_{\ell}

(\ell = \textrm{e},\mu,\tau)

, arising in a left-right symmetric extension of the standard model. The model considers that

\textrm{N}_{\textrm{e}}

and

\textrm{N}_{\mu}

are too heavy to be detected at the LHC. Assuming that the

\textrm{N}_{\tau}

mass is half of the

\textrm{W}_\mathrm{R}

mass, masses of the

\textrm{W}_\mathrm{R}

boson below

3.5~\mathrm{TeV}

are excluded at a

95\%

confidence level (expected exclusion of

3.35~\mathrm{TeV}

). Exclusion bounds are also presented considering different scenarios for the mass ratio between

\textrm{N}_{\tau}

and

\textrm{W}_\mathrm{R}

as function of

\textrm{W}_\mathrm{R}

mass. In the second model, pair production of third-generation scalar leptoquarks that decay into

\tau\tau\textrm{b}\textrm{b}

is considered, resulting in an observed (expected) exclusion region with leptoquark masses below 1.02

(1.0)~\mathrm{TeV}

, assuming a

100\%

branching fraction for the leptoquark decay to a

\tau

lepton and a bottom quark. These results represent the most stringent limits to date.

Note:

Preliminary results

Data
p p: colliding beams
family: 3
p p: scattering
tau: pair production
tau: hadronic decay
tau: transverse momentum
leptoquark: decay
leptoquark: mass: lower limit
neutrino: heavy: search for

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