scholarly journals EXTENDED GAUGE MODELS AND e−e−→W−W− AT THE NLC

1996 ◽  
Vol 11 (09) ◽  
pp. 1613-1620 ◽  
Author(s):  
THOMAS G. RIZZO
Keyword(s):  
Cross Sections ◽  
Linear Collider ◽  
Center Of Mass ◽  
Lepton Number ◽  
Gauge Models ◽  
Majorana Neutrinos ◽  
The Masses ◽  
Lepton Number Violating

We briefly discuss two possible manifestations of the lepton number violating reaction [Formula: see text] which probes the masses and mixings of heavy Majorana neutrinos, at the Next Linear Collider(NLC). Cross sections for this process are shown to be potentially quite large at center of mass energies of order 1–1.5 TeV.

scholarly journals CONSTRAINTS OF MIXING ANGLES FROM LEPTON NUMBER VIOLATING PROCESSES

1999 ◽  
Vol 14 (06) ◽  
pp. 433-445 ◽  
Author(s):  
HIROYUKI NISHIURA ◽  
KOUICHI MATSUDA ◽  
TAKESHI FUKUYAMA
Keyword(s):  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Mixing Angles ◽  
Left Handed ◽  
Majorana Neutrinos ◽  
Mixing Matrix ◽  
Lepton Number Violating

We discuss the constraints of lepton mixing angles from lepton number violating processes such as neutrinoless double beta decay, μ--e+ conversion and K decay, K-→π+μ-μ- which are allowed only if neutrinos are Majorana particles. The rates of these processes are proportional to the averaged neutrino mass defined by [Formula: see text] in the absence of right-handed weak coupling. Here a, b(j) are flavor(mass) eigenstates and Uaj is the left-handed lepton mixing matrix. We give general conditions imposed on <mν>ab in terms of mi, lepton mixing angles and CP violating phases (three phases in Majorana neutrinos). These conditions are reduced to the constraints among mi, lepton mixing angles and <mν>ab which are irrelevant to the concrete values of CP phases. Given a <mν>ab experimentally, these conditions constrain mi and the lepton mixing angles. Though these constraints are still loose except for neutrinoless double beta decay, they will become helpful through rapid improvements of experiments. By using these constraints we also derive the limits on averaged neutrino masses for μ--e+ conversion and K decay, K-→π+μ-μ-, respectively. We also present the bounds for CP phases in terms of mi, mixing angles and <mν>ab.

On the Majorana neutrinos and neutrinoless double beta decays

2015 ◽  
Vol 30 (25) ◽  
pp. 1530019 ◽  
Author(s):  
Zhi-Zhong Xing ◽  
Ye-Ling Zhou
Keyword(s):  
Complex Plane ◽  
Mass Formula ◽  
New Physics ◽  
Lepton Number ◽  
Majorana Mass ◽  
Majorana Neutrinos ◽  
Massive Neutrinos ◽  
Beta Decays ◽  
Lepton Number Violating

The neutrinoless double-beta [Formula: see text] decay is a lepton-number-violating process which is experimentally unique for identifying the Majorana nature of massive neutrinos. We give a brief overview of some theoretical aspects of this process. In particular, a novel “coupling-rod” diagram is introduced to describe the effective Majorana mass [Formula: see text] in the complex plane. Possible contributions of new physics to [Formula: see text] are also discussed.

scholarly journals Leptogenesis in Supersymmetric Economical 3-3-1 Model

2011 ◽  
Vol 21 (4) ◽  
pp. 295
Author(s):  
Do Thi Huong ◽  
Hoang Ngoc Long ◽  
Nguyen Thi Thuy
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Lepton Number ◽  
Inflationary Scenario ◽  
Loop Level ◽  
Majorana Neutrinos ◽  
The One ◽  
Cosmological Constraint ◽  
Lepton Number Violating

We study a leptogenesis scenario in which the heavy Majorana neutrinos are produced non-thermally in inflaton decays in the supersymmetric economical \(\mathrm{SU}(3)_C\otimes \mathrm{SU}(3)_L \otimes \mathrm{U}(1)_X\) model with inflationary scenario. The lepton-number violating interactions among the inflaton and right-handed neutrinos appear at the one-loop level, and this is a reason for non-thermal leptogenesis scenario. The bound followed from the gravitino abundance and the cosmological constraint on neutrino mass/the neutrino oscillation data is: \(m_{\nu 3} \simeq \frac{0.05}{\delta_{eff}}\) eV. By taking the reheating temperature as low as \(T_R= 10^6\) GeV, we get a limit on the ratio of masses of the light heavies neutrino to those of the inflaton to be: \(\frac{M_{R1}}{M_{\phi}} = 0.87\).

scholarly journals Exploring GeV-scale Majorana neutrinos in lepton-number-violating Λb0 baryon decays

2017 ◽  
Vol 96 (1) ◽  
Author(s):  
Jhovanny Mejía-Guisao ◽  
Diego Milanés ◽  
Néstor Quintero ◽  
José D. Ruiz-Álvarez
Keyword(s):  
Lepton Number ◽  
Majorana Neutrinos ◽  
Lepton Number Violating

scholarly journals Majorana neutrinos and lepton-number-violating signals in top-quark and W-boson rare decays

2006 ◽  
Vol 643 (6) ◽  
pp. 342-347 ◽  
Author(s):  
Shaouly Bar-Shalom ◽  
Nilendra G. Deshpande ◽  
Gad Eilam ◽  
Jing Jiang ◽  
Amarjit Soni
Keyword(s):  
Rare Decays ◽  
Top Quark ◽  
W Boson ◽  
Lepton Number ◽  
Majorana Neutrinos ◽  
Lepton Number Violating

scholarly journals Pair production of heavy neutrinos in next-to-leading order QCD at the hadron colliders in the inverse seesaw framework

2021 ◽  
Vol 36 (04) ◽  
pp. 2150012
Author(s):  
Arindam Das
Keyword(s):  
Standard Model ◽  
Pair Production ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Lepton Number ◽  
Striking Difference ◽  
Type I ◽  
Leading Order ◽  
The Standard Model ◽  
Lepton Number Violating

The explanation of the small neutrino mass can be depicted using some handsome models like type-I and inverse seesaw where the Standard Model gauge singlet heavy right-handed neutrinos are deployed. The common thing in these two models is a lepton number violating parameter, however, its order of magnitude creates a striking difference between them making the nature of the right-handed heavy neutrinos a major play factor. In the type-I seesaw a large lepton number violating parameter involves the heavy right-handed neutrinos in the form of Majorana fermions while a small lepton number violating parameter being involved in the inverse seesaw demands the pseudo-Dirac nature of the heavy right-handed neutrinos. Such heavy neutrinos are accommodated in these models through the sizable mixings with the Standard Model light neutrinos. In this paper we consider the purely inverse seesaw scenario to study the pair production of the pseudo-Dirac heavy neutrinos followed by their various multilepton decay modes through the leading branching fraction at the leading order and next-to-leading order QCD at the LHC with a center-of-mass energy of 13 TeV and a luminosity of 3000 fb[Formula: see text]. We also consider a prospective 100 TeV hadron collider with luminosities of 3000 fb[Formula: see text] and 30,000 fb[Formula: see text], respectively to study the process. Using anomalous multilepton search performed by the CMS at the 8 TeV with 19.5 fb[Formula: see text] luminosity we show prospective search reaches of the mixing angles for the three lepton and four lepton events at the 13 TeV LHC and 100 TeV hadron collider.

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