Invisible Higgs boson decay into massive neutrinos of fourth generation

被引:82
作者
Belotsky, K
Fargion, D
Khlopov, M
Konoplich, R
Shibaev, K
机构
[1] Ctr Cosmoparticle Phys Cosmion, Moscow 125047, Russia
[2] Moscow Engn Phys Inst, Moscow 115409, Russia
[3] Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy
[4] Ist Nazl Fis Nucl, I-00185 Rome, Italy
[5] MV Keldysh Appl Math Inst, Moscow 125047, Russia
[6] NYU, Dept Phys, New York, NY 10003 USA
[7] Manhattan Coll, Dept Phys, Riverdale, NY 10471 USA
关键词
D O I
10.1103/PhysRevD.68.054027
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Results from several recent experiments provide indirect evidence in favor of the existence of a fourth generation neutrino. Such a neutrino with a mass m of about 50 GeV is compatible with current physical and astrophysical constraints and well motivated in the framework of superstring phenomenology. If sufficiently stable, the existence of such a neutrino leads to a drastic change in Higgs boson physics: for a wide range of Higgs boson masses the dominant mode of Higgs boson decay is invisible and the branching ratios for the most promising modes of Higgs boson search are significantly reduced. The proper strategy of Higgs boson searches in such a framework is discussed. It is shown that in the same framework the absence of a signal in the search for invisible Higgs boson decay at the CERN LEP means that the mass of the Higgs boson is greater than 113.5 GeV if the neutrino mass is about 50 GeV.
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页数:4
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