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Signal to background interference in pp →tH- →tW-b b at the LHC Run II

Signal to background interference in pp →tH- →tW-b b at the LHC Run II
Signal to background interference in pp →tH- →tW-b b at the LHC Run II

We investigate in the Large Hadron Collider (LHC) environment the possibility that sizeable interference effects between a heavy charged Higgs boson signal produced via bg→tH- (+c.c.) scattering and decaying via H-→W-A→W-bb (+c.c.) and the irreducible background given by bg→tW-bb topologies could spoil current search approaches where the former and latter channels are treated separately. The rationale for this comes from the fact that a heavy charged Higgs state can have a large width, which can also happen for the CP-odd neutral Higgs state emerging in the ensuing decays, which in turn enables such interferences. We conclude that effects are very significant, both at the inclusive and exclusive level (i.e., both before and after H± selection cuts are enforced, respectively) and typically of a destructive nature. This, therefore, implies that currently established LHC reaches for heavy charged Higgs bosons require some level of rescaling. However, this is possible a posteriori, as the aforementioned H± selection cuts shape the interference contributions at the differential level in a way similar to that of the isolated H± signal, so there is no need to reassess the efficiency of the individual cuts. We show such effects quantitatively by borrowing benchmark points from different Yukawa types of a 2-Higgs doublet model parameter space for H± values starting from around 200 GeV.

2470-0010
Arhrib, Abdesslam
f70919b7-51ed-4211-9033-6ffa9b7127ce
Benbrik, Rachid
90bba75a-4e29-4d13-b589-6dd38568f787
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Santos, Rui
8f2cab89-50f8-45e5-ad1b-2fbcc2ffe358
Sharma, Pankaj
e4f35325-c78f-4b49-ba42-f4f3ec1dde5d
Arhrib, Abdesslam
f70919b7-51ed-4211-9033-6ffa9b7127ce
Benbrik, Rachid
90bba75a-4e29-4d13-b589-6dd38568f787
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Santos, Rui
8f2cab89-50f8-45e5-ad1b-2fbcc2ffe358
Sharma, Pankaj
e4f35325-c78f-4b49-ba42-f4f3ec1dde5d

Arhrib, Abdesslam, Benbrik, Rachid, Moretti, Stefano, Santos, Rui and Sharma, Pankaj (2018) Signal to background interference in pp →tH- →tW-b b at the LHC Run II. Physical Review D, 97 (7), [075037]. (doi:10.1103/PhysRevD.97.075037).

Record type: Article

Abstract

We investigate in the Large Hadron Collider (LHC) environment the possibility that sizeable interference effects between a heavy charged Higgs boson signal produced via bg→tH- (+c.c.) scattering and decaying via H-→W-A→W-bb (+c.c.) and the irreducible background given by bg→tW-bb topologies could spoil current search approaches where the former and latter channels are treated separately. The rationale for this comes from the fact that a heavy charged Higgs state can have a large width, which can also happen for the CP-odd neutral Higgs state emerging in the ensuing decays, which in turn enables such interferences. We conclude that effects are very significant, both at the inclusive and exclusive level (i.e., both before and after H± selection cuts are enforced, respectively) and typically of a destructive nature. This, therefore, implies that currently established LHC reaches for heavy charged Higgs bosons require some level of rescaling. However, this is possible a posteriori, as the aforementioned H± selection cuts shape the interference contributions at the differential level in a way similar to that of the isolated H± signal, so there is no need to reassess the efficiency of the individual cuts. We show such effects quantitatively by borrowing benchmark points from different Yukawa types of a 2-Higgs doublet model parameter space for H± values starting from around 200 GeV.

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PhysRevD.97.075037 - Version of Record
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Accepted/In Press date: 12 February 2018
e-pub ahead of print date: 27 April 2018
Published date: April 2018

Identifiers

Local EPrints ID: 421249
URI: http://eprints.soton.ac.uk/id/eprint/421249
ISSN: 2470-0010
PURE UUID: a5796bfa-7e30-4731-a2d1-9c913ed2c5d6

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Date deposited: 29 May 2018 16:30
Last modified: 16 Dec 2019 18:12

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