Vector Boson Scattering prospective studies in the ZZ fully leptonic decay channel for the High-Luminosity and High-Energy LHC upgrades - INSPIRE

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Vector Boson Scattering prospective studies in the ZZ fully leptonic decay channel for the High-Luminosity and High-Energy LHC upgrades

CMS

Collaboration

2018

18 pages

Report number:

CMS-PAS-FTR-18-014

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Abstract:

Prospective studies for the vector boson scattering (VBS) in the ZZ channel at the HL-LHC are presented, where the Z bosons are identified and measured through their leptonic decays,

\ell = e, \mu

. The results obtained from the 2016 analysis with an integrated luminosity of

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

are projected to the HL-LHC luminosity of

3000~\mathrm{fb}^{-1}

and center-of-mass energy of 14 TeV, taking into account the increased acceptance of the CMS detector. The projected uncertainty in the VBS ZZ cross section is 8.5--10.3

\%

depending on the lepton

\eta

coverage and assumptions made for the systematic uncertainties. A study is performed to separate the longitudinal polarization (

\mathrm{Z_L}

) from the dominant transverse polarizations. The expected sensitivity for the VBS

\mathrm{Z_LZ_L}

fraction is

1.4

standard deviations. The foreseen upgrade coverage of up to

\vert \eta \vert = 3(2.8)

for electrons (muons) leads to a

13\%

improvement in sensitivity compared to the Run 2 acceptance. Extending the coverage for electrons up to

\vert \eta \vert = 4

would result in a modest increase in the sensitivity. Finally, the HE-LHC option would allow to bring the sensitivity at the 5

\sigma

level for this process.

Note:

Preliminary results

Data
p p: scattering
p p: colliding beams
Z0: pair production
Z0: leptonic decay
CERN LHC Coll: upgrade
vector boson: scattering
polarization: longitudinal
polarization: transverse
sensitivity

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