General flavor blind minimal supersymmetric standard model and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>CP</mml:mi></mml:math>violation

Bartl, A.; Gajdosik, Thomas; Lunghi, Enrico; Masiero, A.; Porod, W.; Stremnitzer, H.; Vives, O.

doi:10.1103/physrevd.64.076009

Cited by 81 publications

(55 citation statements)

References 107 publications

(88 reference statements)

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“…All gaugino masses are unified to M 1/2 at M GUT . As mentioned above, the ∆ parameters do not receive any significant corrections, whereas the diagonal entries are significantly modified (see for instance Tables I and IV in [7]). For a given set of initial conditions (M 1/2 , m 2 0 , A 0 , ∆ ij , tan β) we obtain the full spectrum at M W with the requirement of radiative symmetry breaking.…”

mentioning

confidence: 82%

Grand Unification of Quark and Lepton Flavor Changing Neutral Currents

Ciuchini¹,

Masiero²,

Silvestrini³

et al. 2004

Phys. Rev. Lett.

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In the context of Supersymmetric Grand Unified theories with soft breaking terms arising at the Planck scale, it is generally possible to link flavor changing neutral current and CP violating processes occurring in the leptonic and hadronic sectors. We study the correlation between flavor changing squark and slepton mass insertions in modelsà la SU (5). We show that the constraints coming from lepton flavor violation exhibit a strong impact on CP-violating B decays.The phenomenology of low-energy supersymmetric (SUSY) extensions of the Standard Model (SM) crucially depends on the mechanism responsible for breaking SUSY itself, namely on the structure of the SUSY soft breaking terms. It is possible to explore these terms by studying the production and detection of SUSY particles. In addition, one can shed light on these terms by analyzing the SUSY effects on rare flavor changing neutral current (FCNC) and CP violating processes. Obviously for this latter approach the flavor structure of the soft breaking terms is of utmost importance. Theoretically, we can distinguish two opposite situations. First, we can have SUSY breaking mechanisms which are completely insensitive to flavor (for instance, pure dilaton breaking in supergravities, gauge or anomaly mediated SUSY breaking). Alternatively, SUSY breaking can feel the flavor structure leading to soft breaking terms which are not flavor universal (this is what happens in supergravities which have also moduli breaking). In spite of the original flavor blindness of certain SUSY breaking mechanisms, we can still have large flavor non-universalities in the low-energy SUSY breaking sector. This occurs if the universal soft terms appear at some energy scale much larger than the electroweak scale in the presence of new flavor structures (for instance, in Grand Unified models or in the presence of new Yukawa couplings as in the seesaw model). In the running between these two scales, the soft breaking terms can 'pick up' non-universal contributions: soft scalar masses and scalar trilinear terms bear a 'memory' of the high energy flavor structures through their RG evolution. In conclusion, either that we start from SUSY breaking mechanisms which are not flavor blind or that we produce flavor non-universality through the RG scaling, we can envisage the general situation that soft SUSY breaking terms are flavor non-universal at the electroweak scale.To analyze flavor violating constraints at the electroweak scale, the model independent Mass-Insertion (MI) approximation is advantageous [1]. In this method, the experimental limits lead to upper bounds on the parameters (or combinations of) δ is the average sfermion mass. In addition, the mass-insertions are further sub-divided into LL/LR/RL/RR types, labelled by the chirality of the corresponding SM fermions. Detailed bounds on the individual δs have been derived by considering limits from various FCNC processes [2]. As long as one remains within the simple picture of the Minimal Supersymmetric Standard Model (MSSM), where quarks ...

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confidence: 82%

Grand Unification of Quark and Lepton Flavor Changing Neutral Currents

Ciuchini¹,

Masiero²,

Silvestrini³

et al. 2004

Phys. Rev. Lett.

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“…Ref. [39,40]) where m 5 , m 10 (= m 5,1 , m 10,1 ) and m H 1 ,H 2 are treated as free parameters at M GU T .…”

Section: The Minimal Su(5) Gut Superpotential and Rgesmentioning

confidence: 99%

What if supersymmetry breaking unifies beyond the GUT scale?

2010

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We study models in which soft supersymmetry-breaking parameters of the MSSM become universal at some unification scale, M in , above the GUT scale, M GU T . We assume that the scalar masses and gaugino masses have common values, m 0 and m 1/2 respectively, at M in . We use the renormalization-group equations of the minimal supersymmetric SU(5) GUT to evaluate their evolutions down to M GU T , studying their dependences on the unknown parameters of the SU(5) superpotential. After displaying some generic examples of the evolutions of the soft supersymmetry-breaking parameters, we discuss the effects on physical sparticle masses in some specific examples. We note, for example, that near-degeneracy between the lightest neutralino and the lighter stau is progressively disfavoured as M in increases. This has the consequence, as we show in (m 1/2 , m 0 ) planes for several different values of tan β, that the stau coannihilation region shrinks as M in increases, and we delineate the regions of the (M in , tan β) plane where it is absent altogether. Moreover, as M in increases, the focus-point region recedes to larger values of m 0 for any fixed tan β and m 1/2 . We conclude that the regions of the (m 1/2 , m 0 ) plane that are commonly favoured in phenomenological analyses tend to disappear at large M in .

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“…Consequently, EW precision tests are satisfied only for quite large values of the NP scale f ≥ (2-3) TeV [138,139] that are unable to solve the little hierarchy problem. Since the LH model belongs to the class of models with Constrained Minimal Flavor Violation (CMFV) [12], the contributions of the new particles to FCNC processes turn out to be at most (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)% [140][141][142][143][144][145][146].…”

Section: The Littlest Higgsmentioning

confidence: 99%

B, D and K decays

et al. 2008

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With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches will provide precious complementary information, since most probably it will not be possible to measure the full spectrum of new particles and their couplings through direct production. In particular, precision measurements and computations in the realm of flavor physics are expected to play a key role in constraining the unknown parameters of the Lagrangian of any NP model emerging from direct searches at the LHC.The aim of Working Group 2 was twofold: on the one hand, to provide a coherent up-to-date picture of the status of flavor physics before the start of the LHC; on the other hand, to initiate activities on the path towards integrating information on NP from high-p T and flavor data.This report is organized as follows: in Sect. 1, we give an overview of NP models, focusing on a few examples that have been discussed in some detail during the workshop, with a short description of the available computational tools for flavor observables in NP models. Section 2 contains a concise discussion of the main theoretical problem in flavor physics: the evaluation of the relevant hadronic matrix elements for weak decays. Section 3 contains a detailed discussion of NP effects in a set of flavor observables that we identified as "benchmark channels" for NP searches. The experimental prospects for flavor physics at future facilities are discussed in Sect. 4. Finally, Sect. 5 contains some assessEur. Phys. J. C (2008) 57: 309-492 311 ments on the work done at the workshop and the prospects for future developments.

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General flavor blind minimal supersymmetric standard model andCPviolation

Cited by 81 publications

References 107 publications

Grand Unification of Quark and Lepton Flavor Changing Neutral Currents

Grand Unification of Quark and Lepton Flavor Changing Neutral Currents

What if supersymmetry breaking unifies beyond the GUT scale?

B, D and K decays

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