Search for Higgs boson decays into two new low-mass spin-0 particles in the 4$b$ channel with the ATLAS detector using $pp$ collisions at $\sqrt{s}= 13$ TeV - INSPIRE

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Search for Higgs boson decays into two new low-mass spin-0 particles in the 4 $b$ channel with the ATLAS detector using $pp$ collisions at $\sqrt{s}= 13$ TeV

ATLAS

Collaboration

May 25, 2020

28 pages

Published in:

Phys.Rev.D 102 (2020) 11, 112006

Published: Dec 7, 2020

e-Print:

2005.12236 [hep-ex]

DOI:

10.1103/PhysRevD.102.112006

PDG: Other Mass Limits

Report number:

CERN-EP-2020-067

Experiments:

CERN-LHC-ATLAS

View in:

reference search69 citations

Citations per year

Abstract: (APS)

This paper describes a search for beyond the Standard Model decays of the Higgs boson into a pair of new spin-0 particles subsequently decaying into

b

-quark pairs,

H \rightarrow aa \rightarrow (b\bar{b})(b\bar{b})

, using proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider at center-of-mass energy

\sqrt{s}=13

TeV. This search focuses on the regime where the decay products are collimated and in the range

15 \leq m_a \leq 30

GeV and is complementary to a previous search in the same final state targeting the regime where the decay products are well separated and in the range

20 \leq m_a \leq 60

GeV. A novel strategy for the identification of the

a \rightarrow b\bar{b}

decays is deployed to enhance the efficiency for topologies with small separation angles. The search is performed with 36 fb

^{-1}

of integrated luminosity collected in 2015 and 2016 and sets upper limits on the production cross-section of

H \rightarrow aa \rightarrow (b\bar{b})(b\bar{b})

, where the Higgs boson is produced in association with a

Z

boson.

Note:

40 pages in total, author list starting page 24, 10 figures, 2 table, published by Phys.Rev.D. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2018-47/

p p: colliding beams
Higgs particle: associated production
Z0: associated production
Higgs particle: decay modes
p p: scattering
new physics: search for
Higgs particle: rare decay
bottom: multiple production
bottom: particle identification
new particle

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Figures(10)

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