Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at <math altimg="si1.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.2em"/><mtext>TeV</mtext></math> - INSPIRE

DataBETA

Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at $\sqrt{s} = 13 TeV$

CMS

Collaboration

Nov 11, 2020

34 pages

Published in:

Phys.Lett.B 819 (2021) 136409

Published: May 28, 2021
and
Published: Aug 10, 2021

e-Print:

2011.06028 [hep-ex]

DOI:

10.1016/j.physletb.2021.136409 (publication)

PDG:

{{\mathit W}^{+}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \gamma}}

Report number:

CMS-SMP-20-008,
CERN-EP-2020-197

Experiments:

CERN-LHC-CMS

View in:

reference search13 citations

Citations per year

Abstract: (Elsevier B.V.)

A search is performed for the rare decay

W^{\pm} \to π^{\pm} γ

in proton-proton collisions at

\sqrt{s} = 13 TeV

. Data corresponding to an integrated luminosity of

137 {fb}^{- 1}

were collected during 2016 to 2018 with the CMS detector. This analysis exploits a novel search strategy based on W boson production in top quark pair events. An inclusive search for the

W^{\pm} \to π^{\pm} γ

decay is not optimal at the LHC because of the high trigger thresholds. Instead, a trigger selection is exploited in which the W boson originating from one of the top quarks is used to tag the event in a leptonic decay. The W boson emerging from the other top quark is used to search for the

W^{\pm} \to π^{\pm} γ

signature. Such decays are characterized by an isolated track pointing to a large energy deposit, and by an isolated photon of large transverse momentum. The presence of b quark jets reduces the background from the hadronization of light-flavor quarks and gluons. The

W^{\pm} \to π^{\pm} γ

decay is not observed. An upper exclusion limit is set to this branching fraction, corresponding to

1.50 \times 10^{- 5}

at 95% confidence level, whereas the expected upper exclusion limit is

{0.85}_{- 0.29}^{+ 0.52} \times 10^{- 5}

.

Note:

Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/SMP-20-008 (CMS Public Pages)

CMS
Standard model
EWK
p p: colliding beams
top: pair production
W: rare decay
W: radiative decay
p p: scattering
W: leptonic decay
jet: bottom

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