EPJ

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EPJ C - Particles and Fields
Particles and Fields


Eur. Phys. J. C 25, 379-389 (2002)
DOI: 10.1007/s10052-002-01001-3

What is the ${W b \bar b}$, ${Z b \bar b}$ or $ {t \bar t b \bar b}$ irreducible background to the light Higgs-boson searches at LHC?

B.P. Kersevan1, 2 and E. Richter-Was3, 4

1  Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
2  Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
3  Institute of Computer Science, Jagellonian University, 30-072 Krakow, ul. Nawojki 11, Poland
4  Institute of Nuclear Physics, 30-055 Krakow, ul. Kawiory 26a, Poland

(Received: 15 March 2002 / Revised version: 12 June 2002 / Published online: 30 August 2002 )

Abstract
The ${W b \bar b}$, ${Z b \bar b}$ and $ {t \bar t b \bar b}$ production at LHC are irreducible backgrounds for the possible observability of the standard model and minimal supersymmetric standard model light Higgs boson in processes involving associated WH, ZH and $t \bar t H$ production followed by the $H \to b \bar b$ decay. The comparison presented in this paper uses the background estimates obtained with (a) the complete massive matrix element implemented in the AcerMC Monte Carlo generator and (b) the PYTHIA implementation of the inclusive W, Z, and $t \bar t$ production, followed by the parton showering mechanism. Both approaches lead to the production of the final state of interest but differ in the approximations used. The focal point of this study is the comparison of the two approaches when estimating the background contributions to the light Higgs boson searches at the LHC.



© Società Italiana di Fisica, Springer-Verlag 2002

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