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	The search for heavy Majorana neutrinos
	Atre, A. ; Tao Han ; Pascoli, S. ; Bin Zhang
	2010-10-12 ; 2010-10-12
关键词	Experimental/ B mesons CP invariance double beta decay heavy tau leptons high-energy elementary particle interactions intermediate boson interactions lepton decay meson leptonic decay muon production neutrino mass neutrino oscillations proton-proton inclusive interactions/ heavy Majorana neutrino mass lepton-number violating processes tau leptons decays pseudoscalar mesons branching fractions rare meson decays Majorana neutrino mixing hadron collider experiments Tevatron Majorana neutrino production LHC neutrinoless double-beta decay gauge boson fusion channel W/sup +/+W/sup +/ producing muon/sup +/+muon/sup +/ CP-violation tau /sup -/ decay into electron/sup +/+pion+kaon B/sup +/ decay into muon/sup +/+tau/sup +/+kaon/sup -/ W/sup +/+W/sup +/ producing tau/sup +/+tau/sup +// A1335 Decays of leptons A1460J Heavy leptons A1385K Hadron induced inclusive reactions, including total cross sections, (energy > 10 GeV) A1385N Hadron induced very high energy interactions (E > 1 TeV) A1460G Neutrinos A2340 beta decay electron and muon capture A1130E Charge conjugation, parity, time reversal and other discrete symmetries A1320H B meson leptonic/semileptonic decays
中文摘要	The Majorana nature of neutrinos can be experimentally verified only via lepton-number violating processes involving charged leptons. We study 36 lepton-number violating (LV) processes from the decays of tau leptons and pseudoscalar mesons. These decays are absent in the Standard Model but, in presence of Majorana neutrinos in the mass range ~ 100 MeV to 5 GeV, the rates for these processes would be enhanced due to their resonant contribution. We calculate the transition rates and branching fractions and compare them to the current bounds from direct experimental searches for Delta L = 2 tau and rare meson decays. The experimental non-observation of such LV processes places stringent bounds on the Majorana neutrino mass and mixing and we summarize the existing limits. We also extend the search to hadron collider experiments. We find that, at the Tevatron with 8 fb/sup -1/ integrated luminosity, there could be 2 sigma (5 sigma ) sensitivity for resonant production of a Majorana neutrino in the mu /sup +/-/ mu /sup +/-/ modes in the mass range of ~10-180 GeV (10-120 GeV). This reach can be extended to ~10-375 GeV (10-250 GeV) at the LHC of 14 TeV with 100 fb/sup -1/. The production cross section at the LHC of 10 TeV is also presented for comparison. We study the mu /sup +/-/e/sup +/-/ modes as well and find that the signal could be large enough even taking into account the current bound from neutrinoless double-beta decay. The signal from the gauge boson fusion channel W/sup +/W/sup +/ rarr l /sub 1//sup +/ l /sub 2//sup +/ at the LHC is found to be very weak given the rather small mixing parameters. We comment on the search strategy when a tau lepton is involved in the final state.
语种	英语
出版者	Societa Italiana di Fisica ; Italy
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/81655]
专题	清华大学
推荐引用方式 GB/T 7714	Atre, A.,Tao Han,Pascoli, S.,et al. The search for heavy Majorana neutrinos[J],2010, 2010.
APA	Atre, A.,Tao Han,Pascoli, S.,&Bin Zhang.(2010).The search for heavy Majorana neutrinos..
MLA	Atre, A.,et al."The search for heavy Majorana neutrinos".(2010).

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