Observation of same-sign WW production from double parton scattering in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Tumasyan, Armen; Adam, Wolfgang; Andrejkovic, Janik Walter; Bergauer, Thomas; Chatterjee, Suman; Damanakis, Konstantinos; Dragicevic, Marko; Escalante Del Valle, Alberto; Hussain, Priya Sajid; Jeitler, Manfred

doi:10.1103/PhysRevLett.131.091803

Observation of same-sign WW production from double parton scattering in proton-proton collisions at $\sqrt{s}$ = 13 TeV

CMS

Collaboration

Jun 6, 2022

20 pages

Published in:

Phys.Rev.Lett. 131 (2023) 091803

Published: Sep 1, 2023

e-Print:

2206.02681 [hep-ex]

DOI:

10.1103/PhysRevLett.131.091803 (publication)

Report number:

CMS-SMP-21-013,
CERN-EP-2022-092

Experiments:

CERN-LHC-CMS

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Abstract: (arXiv)

The first observation of the production of W

^\pm

W

^\pm

bosons from double parton scattering processes using same-sign electron-muon and dimuon events in proton-proton collisions is reported. The data sample corresponds to an integrated luminosity of 138 fb

^{-1}

recorded at a center-of-mass energy of 13 TeV using the CMS detector at the CERN LHC. Multivariate discriminants are used to distinguish the signal process from the main backgrounds. A binned maximum likelihood fit is performed to extract the signal cross section. The measured cross section for production of same-sign W bosons decaying leptonically is 80.7

\pm

11.2 (stat)

^{+9.5}_{-8.6}

(syst)

\pm

12.1 (model) fb, whereas the measured fiducial cross section is 6.28

\pm

0.81 (stat)

\pm

0.69 (syst)

\pm

0.37 (model) fb. The observed significance of the signal is 6.2 standard deviations above the background-only hypothesis.

Note:

All the figures and tables, including additional supplementary figures and tables, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-21-013 (CMS Public Pages). arXiv admin note: text overlap with arXiv:1909.06265

p p: colliding beams
parton: multiple scattering
p p: scattering
cross section: measured
W: pair production
W: leptonic decay
same sign
CERN Lab
muon: pair production
electron muon

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