Precision test of a Fermion mass texture

Roberts, Richard G.; Romanino, Andrea; Ross, Graham G.; Velasco-Sevilla, Liliana

doi:10.1016/s0550-3213(01)00408-4

Cited by 139 publications

(204 citation statements)

References 31 publications

(70 reference statements)

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“…Moreover, as pointed out in ref. [36], the prediction for |V ub /V cb | is off by a factor of 2. This tension can be traced back to the left-right symmetric structure of Yukawa matrices and the presence of texture zeros in the (1,3), (3,1) entries in the quark Yukawa matrices.…”

Section: Jhep01(2014)117mentioning

confidence: 97%

Linking natural supersymmetry to flavour physics

Dudas

Gersdorff

Pokorski

et al. 2014

J. High Energ. Phys.

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With the aim of linking natural supersymmetry to flavour physics, a model is proposed based on a family symmetry G × U(1), where G is a discrete nonabelian subgroup of SU(2), with both F-term and (abelian) D-term supersymmetry breaking. A good fit to the fermion masses and mixing is obtained with the same U(1) charges for the left-and right-handed quarks of the first two families and the right-handed bottom quark, and with zero charge for the left-handed top-bottom doublet and the the right handed top. The model shows an interesting indirect correlation between the correct prediction for the V ub /V cb ratio and large right-handed rotations in the (s, b) sector, required to diagonalise the Yukawa matrix. For the squarks, one obtains almost degenerate first two generations. The main source of the FCNC and CP violation effects is the splitting between the first two families and the right-handed sbottom determined by the relative size of F-term and D-term supersymmetry breaking. The presence of the large right-handed rotation implies that the bounds on the masses of the first two families of squarks and the right handed sbottom are in a few to a few tens TeV range. The picture that emerges is light stops and left handed sbottom and much heavier other squarks.

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Section: Jhep01(2014)117mentioning

confidence: 97%

Linking natural supersymmetry to flavour physics

Dudas

Gersdorff

Pokorski

et al. 2014

J. High Energ. Phys.

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show abstract

“…[7] and by Roberts, Romanino, Ross and Velasco-Sevilla (RRRV) in Ref. [8]. Note that quark mass matrices of both RW and RRRV forms are symmetric instead of Hermitian.…”

Section: Comparison With Two Existing Ansätzementioning

confidence: 99%

“…Note that quark mass matrices of both RW and RRRV forms are symmetric instead of Hermitian. Their consequences on quark flavor mixing and CP violation are essentially unchanged, however, if the Hermiticity is imposed on them [8]. For this reason, we consider the Hermitian versions of the RW and RRRV Ansätze and compare them with Eq.…”

Section: Comparison With Two Existing Ansätzementioning

confidence: 99%

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Hierarchy and up-down parallelism of quark mass matrices

Mei

Zhang

2003

Phys. Rev. D

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In view of the quark mass hierarchy and in the assumption of the up-down parallelism, we derive two phenomenologically-favored patterns of Hermitian quark mass matrices from the quark flavor mixing matrix. We compare one of them with two existing Ansätze proposed by Rosner and Worah and by Roberts et al, and find that only the latter is consistent with the present experimental data. PACS number(s): 12.15.Ff, 12.10.Kt

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“…However, this approach cannot be justified without some (so far unspecified) symmetry reason, especially taking into account that the Yukawa couplings of the SM do not share these features. Thus we will study both CP violation and the origin of flavour structures in the framework of a supersymmetric SU (3) family symmetry model which has been shown [2,3,4] to provide a correct texture for the Yukawa matrices in agreement with an accurate phenomenological fit [5]. However, the improvement on the determination of CKM mixing angles and CP asymmetries requires the presence of phases in the elements of the Yukawa matrices.…”

Section: O Vivesmentioning

confidence: 99%

Spontaneous CP violation in a SUSY theory of flavour

Vives¹,

Velasco-Sevilla²,

Ross³

2003

Proceedings of International Workshop on Astroparticle and High Energy Physics — PoS(AHEP2003)

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We present a model based on an SU (3) family symmetry providing a full description of quark and lepton masses and mixing angles. CP is spontaneously broken in the flavour sector reproducing the observed results of the Jarlskog invariant in the CKM mixing matrix. Moreover, our model predicts the amount of CP violation to be expected in the neutrino sector. Furthermore, this approach solves the Supersymmetric CP and FCNC problems in a gravity mediation scenario. The symmetry predicts the structure of the squark and slepton mass matrices and this will be checked in future experiments.The flavour sector of the SM remains the big unknown in high energy physics. In the SM Flavour (Yukawa) couplings are not fixed by symmetry and so they are merely unrelated parameters to be fixed by experiment. In our search for a more fundamental theory we need to improve our understanding of the flavour physics, and in analogy to the gauge sector, one might expect an spontaneously broken familly symmetry which determines the different flavour parameters [1]. The appearance of CP violation in the SM is equally mysterious. We do not know why there are complex couplings in the SM giving rise to a violation of the CP symmetry in neutral meson systems. In fact, these two problems are deeply related in the SM as the Yukawa couplings are the only source for both the flavour structures and the CP violation phenomena, although this need not be so in other extensions of the SM where new sources of CP violation different from the Yukawa couplings are present. * Speaker.

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Precision test of a Fermion mass texture

Cited by 139 publications

References 31 publications

Linking natural supersymmetry to flavour physics

Linking natural supersymmetry to flavour physics

Hierarchy and up-down parallelism of quark mass matrices

Spontaneous CP violation in a SUSY theory of flavour

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