Search for 'invisible' Higgs signals at LHC via associated production with gauge bosons

被引：91
|
作者：
Godbole, RM
Guchait, M
Mazumdar, K
Moretti, S
Roy, DP
机构：
[1] DESY, Div Theory, D-22603 Hamburg, Germany
[2] Tata Inst Fundamental Res, Dept High Energy Phys, Bombay 400005, Maharashtra, India
[3] CERN, EP Div, CH-1211 Geneva, Switzerland
[4] Univ Southampton, Dept Phys & Astron, Southampton SO16 7GH, Hants, England
[5] Tata Inst Fundamental Res, Dept Theoret Phys, Bombay 400005, Maharashtra, India
[6] Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany
来源：
PHYSICS LETTERS B | 2003年 / 571卷 / 3-4期
关键词：
D O I：
10.1016/j.physletb.2003.06.066
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A light Higgs boson with substantial branching ratio into invisible channels can occur in a variety of models with: light neutralinos, spontaneously broken lepton number, radiatively generated neutrino masses, additional singlet scalar(s) and/or right handed neutrinos in the extra dimensions of TeV scale gravity. We study the observability of the WH and ZH modes at LHC with H decaying invisibly, by carrying out a detailed simulation with two event generators (HERWIG and PYTHIA) and realistic detector simulations (GETJET and CMSJET). We find that the signal with 'single lepton plus missing E-T' resulting from WH production suffers from a very large background due to the (off-shell) W* production via the Drell-Yan process. In contrast, the ZH mode provides a clean signal in the 'dilepton plus missing ET' channel. By exploiting this second signature, we show that invisible branching ratios of Higgs bosons, BRinv, larger than similar to 0.42 (0.70) can be probed at 5sigma level for M-H = 120 (160) GeV, respectively, assuming an accumulated luminosity of L = 100 fb(-1). (C) 2003 Elsevier B.V All rights reserved.
引用
收藏
页码：184 / 192
页数：9
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