Fitting neutrino physics with a U(1)
                R
               lepton number

Bertuzzo, Enrico; Frugiuele, Claudia

doi:10.1007/jhep05(2012)100

Cited by 32 publications

(54 citation statements)

References 60 publications

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“…A sneutrino thus can play the role of a down type Higgs boson, a phenomenon which has crucial implications [79,86,91,92,95] for our purpose that we would discuss later in this work. The right handed neutrino, on the other hand, not only provides a small tree level Dirac neutrino mass but also gives rise to an additional tree level contribution to the Higgs boson mass proportional to the neutrino Yukawa coupling [95].…”

Section: Jhep02(2015)124mentioning

confidence: 99%

“…The breaking of R-symmetry has to be communicated to the visible sector and in this work we consider anomaly mediation of supersymmetry breaking playing the role of the messenger of R-breaking. This is known as anomaly mediated R-breaking (AMRB) [86]. A non-zero gravitino mass generates Majorana gaugino masses and trilinear scalar couplings.…”

Section: The Neutralino Sector: R-breaking Casementioning

confidence: 99%

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h → γγ in U(1) R -lepton number model with a right-handed neutrino

Chakraborty

Datta

Roy

2015

J. High Energ. Phys.

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We perform a detailed study of the signal rate of the lightest Higgs boson in the diphoton channel (µ γγ ), recently analyzed by both the ATLAS and CMS collaborations at the Large Hadron Collider, in the framework of U(1) R − lepton number model with a right handed neutrino superfield. The corresponding neutrino Yukawa coupling, 'f ', plays a very important role in the phenomenology of this model. A large value of f ∼ O(1) provides an additional tree level contribution to the lightest Higgs boson mass along with a very light (mass ∼ a few hundred MeV) bino like neutralino and a small tree level mass of one of the active neutrinos that is compatible with various experimental results. In the presence of this light neutralino, the total decay width of the Higgs boson and its various branching fractions are affected. When studied in conjunction with the recent LHC results, these put significant constraints on the parameter space. The signal rate µ γγ obtained in this scenario is compatible with the recent results from both the ATLAS and the CMS collaborations at 1σ level. A small value of 'f ', on the other hand, is compatible with a sterile neutrino acting as a 7 keV dark matter that can explain the observation of a mono-energetic X-ray photon line by the XMM-Newton X-ray observatory. Because of the absence of a light neutralino, the total decay width of the lightest Higgs boson in this case remains close to the SM expectation. Hence, in the small 'f ' scenario we obtain a relatively larger value of µ γγ which is closer to the central values reported recently by these two collaborations.

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Section: Jhep02(2015)124mentioning

confidence: 99%

Section: The Neutralino Sector: R-breaking Casementioning

confidence: 99%

h → γγ in U(1) R -lepton number model with a right-handed neutrino

Chakraborty

Datta

Roy

2015

J. High Energ. Phys.

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“…An approximate expression, valid in the limit in 3 In this framework also neutrino masses can be accommodated. [13] which all the Dirac masses are smaller than the scalar adjoint masses, is given by…”

Section: Framework 2: Dirac Gauginos and R-symmetrymentioning

confidence: 99%

“…Henceforth we will just consider these two scenarios in the quark sector. 13 If they are both equal we will use just one index as customary.…”

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confidence: 99%

Flavour, electroweak symmetry breaking and dark matter: state of the art and future prospects

et al. 2015

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With the discovery of the Higgs boson the Standard Model has become a complete and comprehensive theory, which has been verified with unparalleled precision and in principle might be valid at all scales. However, several reasons remain why we firmly believe that there should be physics beyond the Standard Model. Experiments such as the LHC, new B factories, and earth-and space-based astro-particle experiments provide us with unique opportunities to discover a coherent framework for many of the long-standing puzzles of our field. Here we explore several significant interconnections between the physics of the Higgs boson, the physics of flavour, and the experimental clues we have about dark matter.

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“…This note is based mainly on Ref. [9], but similar ideas have been developed in [10][11][12][13][14][15].…”

Section: Motivationmentioning

confidence: 99%

The Discovery of Supersymmetry

Riva

2013

EPJ Web of Conferences

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Abstract. Recent LHC searches have provided strong evidence for the Higgs, a boson whose gauge quantum numbers coincide with those of a SM fermion, the neutrino. This raises the question of whether Higgs and neutrino can be related by supersymmetry. I will show explicitly the implications of models where the Higgs is the sneutrino: from a theoretical point of view an R-symmetry, acting as lepton number, is necessary; on the experimental side, squarks exhibit novel decays into quarks and leptons, allowing to differentiate these scenarios from the ordinary MSSM. MotivationOn the 4th of July 2012, CERN announced the discovery of a new particle [1]. Its couplings, it has often been said, resemble those of the SM Higgs boson. Indeed, the fact that its couplings to the W ± (to the Z) electroweak gauge bosons is within 30% of 2m -8], tells us that this scalar must be part of a doublet of S U(2) L , with hypercharge 1/2 and that its vacuum expectation value (vev) is responsible for the W ± , Z masses. It strikes that the quantum numbers of these scalars are the same as the ones of the known leptons. So, the first question one is brought to ask is whether there can be an underlying symmetry connectingIt is well known that the only such a symmetry, capable of relating bosons with fermions, is supersymmetry (SUSY). This observation brings a glimpse of hope in a moment in which all the supersymmetric particles, predicted in the minimal supersymmetric models (MSSM), are being pushed to higher and higher scales by the stringent LHC limits. Indeed, if the relation Eq. (1) were really due to a symmetry, then the implications would be fantastic: the first supersymmetric particle, has already been discovered! In this note I explore this possibility further, to outline the low-energy behaviour of SUSY models that explain Eq. (1). This note is based mainly on Ref. One, Two or No Higgs doublet?In the SM, the Higgs doublet H couples to down-type quarks through the Yukawa structureQ L Hd R (and similarly for leptons). Up-type quarks, couple to the same a e-mail: francesco.riva@epfl.chHiggs. However, due to their different charge, they get masses throughQSupersymmetric theories need more structure than just a SUSY version of the SM model. First of all, a SUSY version of the SM with only one Higgs doublet is inconsistent, as a single higgsino induces non-vanishing anomalies that break the SM gauge group; an even number of Higgs-doublets is necessary. Furthermore, the couplings of Eq. (2) involving H † are incompatible with unbroken SUSY. So, theories in which the Higgs is the partner of a lepton doublet are consistent from the point of view of anomalies (since there are no higgsinos), and they can successfully account for down-type quark masses throughbut they need large supersymmetry breaking contributions in order to account for up-type masses. Traditionally, this was considered unsatisfactory, as can be read in many books about early supersymmetric model-building " An obvious possibility is to identify the Higgs S U(2) doublet as th...

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Fitting neutrino physics with a U(1) R lepton number

Cited by 32 publications

References 60 publications

h → γγ in U(1) R -lepton number model with a right-handed neutrino

h → γγ in U(1) R -lepton number model with a right-handed neutrino

Flavour, electroweak symmetry breaking and dark matter: state of the art and future prospects

The Discovery of Supersymmetry

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