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Studies of spin effects in charged Higgs boson production with an iterative discriminant analysis at the Tevatron and LHC

Studies of spin effects in charged Higgs boson production with an iterative discriminant analysis at the Tevatron and LHC
Studies of spin effects in charged Higgs boson production with an iterative discriminant analysis at the Tevatron and LHC
We report on detailed Monte Carlo comparisons of selection variables to separate tbH± signal events from the standard model t ‾t background using an iterative discriminant analysis (IDA) method. While kinematic differences exist between the two processes whenever mH±   mW±, the exploration of the spin difference between the charged Higgs and the W± gauge boson becomes crucial in the particularly challenging case of near degeneracy of the charged Higgs boson mass with the W± mass. The TAUOLA package is used to decay the tau leptons emerging from the charged Higgs and W± boson decays taking the spin difference properly into account. We demonstrate that, even if the individual selection variables have limited discriminant power, the IDA method achieves a significant separation between the expected signal and background. For both Tevatron and LHC energies, the impact of the spin effects and H± mass on the separation of signal and background has been studied quantitatively. The effect of a hard transverse momentum cut to remove QCD background has been studied and it is found that the spin effects remain important. The separation is expressed in purity versus efficiency curves. The study is performed for charged Higgs boson masses between the W± mass and near the top mass.
1434-6044
311-327
Hesselbach, S.
7aaff8e7-583a-4aec-b423-54cbf7a8bdd3
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Rathsman, J.
dceee333-e74a-4b22-8f71-58dab09d20fb
Sopczak, A.
af70f331-b0ee-4db5-a50b-2f1492a6b3df
Hesselbach, S.
7aaff8e7-583a-4aec-b423-54cbf7a8bdd3
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Rathsman, J.
dceee333-e74a-4b22-8f71-58dab09d20fb
Sopczak, A.
af70f331-b0ee-4db5-a50b-2f1492a6b3df

Hesselbach, S., Moretti, S., Rathsman, J. and Sopczak, A. (2008) Studies of spin effects in charged Higgs boson production with an iterative discriminant analysis at the Tevatron and LHC. The European Physical Journal C, 53, 311-327. (doi:10.1140/epjc/s10052-007-0480-7).

Record type: Article

Abstract

We report on detailed Monte Carlo comparisons of selection variables to separate tbH± signal events from the standard model t ‾t background using an iterative discriminant analysis (IDA) method. While kinematic differences exist between the two processes whenever mH±   mW±, the exploration of the spin difference between the charged Higgs and the W± gauge boson becomes crucial in the particularly challenging case of near degeneracy of the charged Higgs boson mass with the W± mass. The TAUOLA package is used to decay the tau leptons emerging from the charged Higgs and W± boson decays taking the spin difference properly into account. We demonstrate that, even if the individual selection variables have limited discriminant power, the IDA method achieves a significant separation between the expected signal and background. For both Tevatron and LHC energies, the impact of the spin effects and H± mass on the separation of signal and background has been studied quantitatively. The effect of a hard transverse momentum cut to remove QCD background has been studied and it is found that the spin effects remain important. The separation is expressed in purity versus efficiency curves. The study is performed for charged Higgs boson masses between the W± mass and near the top mass.

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Published date: January 2008

Identifiers

Local EPrints ID: 57301
URI: http://eprints.soton.ac.uk/id/eprint/57301
ISSN: 1434-6044
PURE UUID: b9e8f560-f65d-4d8e-9296-568122c4ed1f

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Date deposited: 20 Aug 2008
Last modified: 09 Nov 2021 09:53

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Contributors

Author: S. Hesselbach
Author: S. Moretti
Author: J. Rathsman
Author: A. Sopczak

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