共查询到20条相似文献,搜索用时 31 毫秒
1.
Takeo MoroiNorimi Yokozaki 《Physics letters. [Part B]》2011,701(5):568-575
SUSY CP problem in the gauge mediation supersymmetry breaking model is reconsidered. We pay particular attention to two sources of CP violating phases whose effects were not seriously studied before; one is the effect of the breaking of the GUT relation among the gaugino masses due to the field responsible for the GUT symmetry breaking, and the other is the supergravity effect on the supersymmetry breaking parameters, in particular, on the bi-linear supersymmetry breaking Higgs mass term. We show that both of them can induce too large electric dipole moments of electron, neutron, and so on, to be consistent with the experimental bounds. 相似文献
2.
Saebyok Bae Byungchul Chung P. Ko 《The European Physical Journal C - Particles and Fields》2008,54(4):601-616
The CP violating phases in soft SUSY breaking terms may induce indirect CP violation in the neutral Higgs boson sector through
SUSY particle loops as well as direct CP violation in the γγ→Hi (i=1,2,3) through CP violating vertices. We present a complete analysis of the MSSM Higgs sector CP violation at photon colliders
including the chargino loop contributions in the regime , where the CP violating mixing in the neutral Higgs sector is very strongly influenced by the scalar top loop, more so than
the chargino and neutralino ones. However, the CP violating phases of the higgsino and wino mass parameters may still generate
direct CP violation in γγ→Hi. In this process, the CP violating phenomena become very rich, and thus we study the production rates and polarization asymmetries
in the Higgs production in detail. Photon colliders with high luminosity and well controlled polarized initial photon beams
are indispensable in determining the CP properties of neutral Higgs bosons.
PACS 14.80.Cp; 12.60.Jv; 11.30.Er 相似文献
3.
《Physics letters. [Part B]》2006,643(2):115-123
We analyse the general constraints on unified gauge models with spontaneous CP breaking that satisfy the conditions that (i) CP violation in the quark sector is described by a realistic complex CKM matrix, and (ii) there is no significant flavor changing neutral current effects in the quark sector. We show that the crucial requirement in order to conform to the above conditions is that spontaneous CP breaking occurs at a very high scale by complex vevs of standard model singlet Higgs fields. Two classes of models are found, one consisting of pure Higgs extensions and the other one involving fermionic extensions of the standard model. We give examples of each class and discuss their possible embeddings into higher unified theories. One of the models has the interesting property that spontaneous CP violation is triggered by spontaneous P violation, thereby linking the scale of CP violation to the seesaw scale for neutrino masses. 相似文献
4.
Rohini M Godbole 《Pramana》2006,67(5):835-847
In this talk I discuss some aspects of CP violation (CPV) in supersymmetry (SUSY) as well as in the Higgs sector. Further,
I discuss ways in which these may be probed at hadronic colliders. In particular I will point out the ways in which studies
in the
sector at the Tevatron may be used to provide information on this and how the search can be extended to the LHC. I will then
follow this by a discussion of the CP mixing induced in the Higgs sector due to the above-mentioned CPV in the soft SUSY breaking
parameters and its effects on the Higgs phenomenology at the LHC. I would then point out some interesting aspects of the phenomenology
of a moderately light charged Higgs boson, consistent with the LEP constraints, in this scenario. Decay of such a charged
Higgs boson would also allow a probe of a light (≲50 GeV), CP-violating (CPV) Higgs boson. Such a light neutral Higgs boson
might have escaped detection at LEP and could also be missed at the LHC in the usual search channels. 相似文献
5.
If the soft supersymmetry (SUSY) breaking masses and couplings are complex and cancellations do take place in the SUSY induced contributions to the fermionic electric dipole moments, then the CP-violating soft phases can drastically modify much of the known phenomenological pattern of the minimal supersymmetric standard model. In particular, the squark loop content of the dominant Higgs production mechanism at the Large Hadron Collider, the gluon-gluon fusion mode, could be responsible for large corrections to the known cross sections. 相似文献
6.
Physics of Atomic Nuclei - The presence of the 125-GeV Higgs boson in the particle spectrum of the minimal supersymmetric (SUSY) standard model (MSSM) implies that the SUSY breaking scale has to be... 相似文献
7.
M. Maniatis A. von Manteuffel O. Nachtmann 《The European Physical Journal C - Particles and Fields》2008,57(4):719-738
We discuss the CP properties of the potential in the general two-Higgs-doublet model (THDM). This is done in a concise way
using real gauge invariant functions built from the scalar products of the doublet fields. The space of these invariant functions,
parametrising the gauge orbits of the Higgs fields, is isomorphic to the forward light cone and its interior. CP transformations
are shown to correspond to reflections in the space of the gauge invariant functions. We consider CP transformations where
no mixing of the Higgs doublets is taken into account as well as the general case where the Higgs basis is not fixed. We present
basis independent conditions for explicit CP violation which may be checked easily for any THDM potential. Conditions for
spontaneous CP violation, that is CP violation through the vacuum expectation values of the Higgs fields, are also derived
in a basis independent way. 相似文献
8.
U. Moschella 《Letters in Mathematical Physics》1992,24(2):155-163
We show that the breaking of Abelian gauge symmetry implies the existence of dipole singularities in the correlation functions of the (Abelian) Higgs model. We also show that the noninvariance of the Wightman functions does not preclude the implementability of the global gauge symmetry. An explicit example of gauge symmetry breaking (Ferrari's model) is discussed. 相似文献
9.
A generalized Yang-Mills model, which contains, besides the vector part
Vμ, also a scalar part S, is constructed and the dynamical breaking of gauge symmetry in the model is also discussed. It is shown, in terms of Nambu-Jona-Lasinio (NJL) mechanism, that the gauge symmetry breaking can be realized
dynamically in the generalized Yang-Mills model. The combination of the
generalized Yang-Mills model and the NJL mechanism provides a way to overcome
the difficulties related to the Higgs field and the Higgs mechanism in the
usual spontaneous symmetry breaking theory. 相似文献
10.
11.
Stefan Antusch Stephen F. King Michal Malinský Graham G. Ross 《Physics letters. [Part B]》2009,670(4-5):383-389
Can a theory of flavour capable of describing the spectrum of fermion (including neutrino) masses and mixings also contain within it the seeds for a solution of the SUSY flavour and CP problems? We argue that supergravity together with a non-Abelian family symmetry can completely resolve the SUSY flavour and CP problems in a broad class of theories in which family symmetry and CP is spontaneously broken in the flavon sector. We show that a simple superpotential structure can suppress the F-terms of the flavons and GUT scale Higgs fields and that, if this mechanism is implemented, the resulting flavour and CP violation is suppressed and comfortably within the experimental limits. For illustration, we study a specific model based on SU(3) family symmetry, but similar models based on non-Abelian (continuous or discrete) family symmetry will lead to similar results. 相似文献
12.
《Physics letters. [Part B]》1988,201(3):301-305
Higher dimensional gauge theories lead, after dimensional reduction on coset spaces, to four-dimensional gauge theories usually with the natural emergence of a Higgs sector which is completely determined. However, the Higgs fields never appear in the adjoint representation which in many GUTs could lead to a successful spontaneous symmetry breaking towards the low energy gauge group. As an alternative we suggest that the breaking of the four-dimensional GUTs obtained from CSDR could be provided by the Wilson flux breaking and we discuss some semirealistic examples. We also speculate on the possibility that the breaking of the electroweak sector has dynamical origin. 相似文献
13.
It is generally believed that the low energy effective theory of the minimal supersymmetric standard model is the type 2 two Higgs doublet model. We will show that the type 1 two Higgs doublet model can also be as the effective of supersymmetry in a specific case with high scale supersymmetry breaking and gauge mediation. If the other electroweak doublet obtain the vacuum expectation value after the electroweak symmetry breaking, the Higgs spectrum is quite different. A remarkable feature is that the physical Higgs boson mass can be 125 GeV unlike in the ordinary models with high scale supersymmetry in which the Higgs mass is generally around 140 GeV. 相似文献
14.
We revisit the minimal supersymmetric left–right model with B−L=2 triplet Higgs fields and show that a self-consistent picture emerges with automatic R-parity conservation even in the absence of higher-dimensional operators. By computing the effective potential for the Higgs system including heavy Majorana neutrino Yukawa couplings we show that the global minimum of the model can lie in the charge and R-parity conserving domain. The model provides natural solutions to the SUSY phase problem and the strong CP problem and makes several interesting predictions. Quark mixing angles arise only after radiative corrections from the lepton sector are taken into account. A pair of doubly charged Higgs fields remain light below TeV with one field acquiring its mass entirely via renormalization group corrections. We find this mass to be not much above the Bino mass. In the supergravity framework for SUSY breaking, we also find similar upper limits on the stau masses. Natural solutions to the μ problem and the SUSY CP problem entails light SUL(2) triplet Higgs fields, leading to rich collider phenomenology. 相似文献
15.
We propose a geometrical formulation of complementarity between the Higgs phase and the confining phase of a non-abelian gauge theory, introducing local “vierbein” fields to provide for a one-to-one mapping between the states of the two phases. We investigate the gauge structure when a subgroup of the global symmetry is also gauged. The formalism is used to build up a composite model based on a SU(4) of subcolor complementary to a Pati-Salam SU(4), and allowing for dynamical symmetry breaking of SU(2)L ? U(1). 相似文献
16.
It is generally believed that the low energy effective theory of the minimal supersymmetric standard model is the type 2 two Higgs doublet model.We will show that the type 1 two Higgs doublet model can also be as the effective of supersymmetry in a specific case with high scale supersymmetry breaking and gauge mediation.If the other electroweak doublet obtain the vacuum expectation value after the electroweak symmetry breaking,the Higgs spectrum is quite different.A remarkable feature is that the physical Higgs boson mass can be 125 GeV unlike in the ordinary models with high scale supersymmetry in which the Higgs mass is generally around 140 GeV. 相似文献
17.
RN Mohapatra 《Pramana》2000,55(1-2):289-296
It is shown that if the supersymmetric Standard Model (MSSM) emerges as the low energy limit of a high scale left-right symmetric
gauge structure, the number of uncontrollable CP violating phases of MSSM are drastically reduced. In particular it guarantees
the vanishing of the dangerous phases that were at the root of the so called SUSY CP problem. Such a symmetric gauge structure
is independently motivated by the smallness of neutrino masses that arise via seesaw mechanism automatic in the theory. The
minimal version of this theory also provides an explanation of the smallness of ε′/ε as a consequence of the high scale parity
invariance.
This talk is based on work done in collaboration with K S Babu and B Dutta. 相似文献
18.
殷文 《中国物理C(英文版)》2018,(1)
Motivated by the simple toroidal compactification of extra-dimensional SUSY theories, we investigate a partial N =2 supersymmetric(SUSY) extension of the standard model which has an N =2 SUSY sector and an N =1 SUSY sector. We point out that below the scale of the partial breaking of N = 2 to N = 1, the ratio of Yukawa to gauge couplings embedded in the original N =2 gauge interaction in the N =2 sector becomes greater due to a fixed point. Since at the partial breaking scale the sfermion masses in the N = 2 sector are suppressed due to the N = 2 non-renormalization theorem, the anomaly mediation effect becomes important. If dominant, the anomaly-induced masses for the sfermions in the N = 2 sector are almost UV-insensitive due to the fixed point. Interestingly, these masses are always positive, i.e. there is no tachyonic slepton problem. From an example model, we show interesting phenomena differing from ordinary MSSM. In particular, the dark matter particle can be a sbino, i.e. the scalar component of the N = 2 vector multiplet of U(1)_Y. To obtain the correct dark matter abundance, the mass of the sbino, as well as the MSSM sparticles in the N =2 sector which have a typical mass pattern of anomaly mediation, is required to be small. Therefore, this scenario can be tested and confirmed in the LHC and may be further confirmed by the measurement of the N = 2 Yukawa couplings in future colliders. This model can explain dark matter, the muon g-2 anomaly, and gauge coupling unification, and relaxes some ordinary problems within the MSSM. It is also compatible with thermal leptogenesis. 相似文献
19.
Dong-Won Jung 《Pramana》2007,69(5):789-793
In the extra dimensional scenarios with gauge fields in the bulk, the Kaluza-Klein (KK) gauge bosons can induce Nambu-Jona-Lasinio
(NJL) type attractive fourfermion interactions, which can break electroweak symmetry dynamically with accompanying composite
Higgs fields. We consider a possibility that electroweak symmetry breaking (EWSB) is triggered by both a fundamental Higgs
and a composite Higgs arising in a dynamical symmetry breaking mechanism induced by a new strong dynamics. The resulting Higgs
sector is a partially composite two-Higgs doublet model with specific boundary conditions on the coupling and mass parameters
originating at a compositeness scale Λ. The phenomenology of this model is discussed including the collider phenomenology
at LHC and ILC.
相似文献
20.
The Higgs sector of the MSSM may be extended to solve the μ problem by the addition of a gauge singlet scalar field. We consider an extended Higgs model. For simplicity we consider
the case where all the fields in the scalar sector are real.
We analyze the vacuum structure of the model. We address the question of an exothermic phase transition from a broken susy
phase with electroweak symmetry breaking (our current universe) to an exact susy phase with electroweak symmetry breaking
(future susy universe). 相似文献