Higgs-induced flavor-changing neutral current as a source of new physics in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>b</mml:mi><mml:mo>→</mml:mo><mml:mi>s</mml:mi></mml:math>transitions

Joshipura, Anjan S.; Kodrani, Bhavik P.

doi:10.1103/physrevd.81.035013

Cited by 8 publications

(6 citation statements)

References 49 publications

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“…Expressions for this branching ratio in the SM, and the Higgs contribution in a 2HDM with arbitrary Yukawa couplings, can be found in Ref. [10]. The SM value is ð3:51 AE 0:50Þ Â 10 À9 [10] and the current Tevatron upper bound at 95% C.L.…”

Section: Overcoming Tree-level Flavor-changing Neutral Currentsmentioning

confidence: 97%

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Next generation Higgs bosons: Theory, constraints, and discovery prospects at the Large Hadron Collider

Gupta

Wells

2010

Phys. Rev. D

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Particle physics model building within the context of string theory suggests that further copies of the Higgs boson sector may be expected. Concerns regarding tree-level flavor-changing neutral currents are easiest to allay if little or no couplings of next generation Higgs bosons to standard model fermions are allowed. We detail the resulting general Higgs potential and mass spectroscopy in both a standard model extension and a supersymmetric extension. We present the important experimental constraints from meson-meson mixing, loop-induced b ! s decays, and LEP2 direct production limits. We investigate the energy range of the valid perturbation theory of these ideas. In the supersymmetric context we present a class of examples that marginally aids the fine-tuning problem for parameter space where the lightest Higgs boson mass is greater than the standard model limit of 114 GeV. Finally, we study collider physics signatures generic to next generation Higgs bosons, with special emphasis on Ah ! hhZ ! 4b þ 2l signal events, and describe the capability of discovery at the Large Hadron Collider. I. GENERATIONS OF HIGGS BOSONSChiral matter comes in three generations. The simplest hypotheses of electroweak symmetry breaking and fermion mass generation assumes the existence of one Higgs boson in the case of the standard model and a pair of Higgs bosons in the case of supersymmetry. We ask here what the consequences are of having more generations of Higgs bosons in analogy to fermion matter content. We are not the first to ask this question and investigate answers (see for e.g. [1-3] to be highlighted later). Some of our discussion will be known to readers, but that is only to set the stage for describing further material we have developed and, in particular, detailing Large Hadron Collider (LHC) implications for next generation Higgs boson ideas that survive scrutiny.The question is of increased interest of late for two reasons. One, the LHC begins soon and enters the prime real estate of Higgs boson phenomenology, and we should be prepared to discover all reasonable and viable ideas. The physical particle spectrum of the Higgs sector, if it exists, is speculation at present. Investigating various scenarios that may yield phenomenology that is different from the simplest standard model (SM) approach is needed in order to develop more interpretive power over the data when it comes.A second reason to consider a next generation of Higgs bosons is from recent developments in string phenomenology. Some approaches to particle physics model building from string theory suggest that further copies of Higgs bosons may be generic among solutions. For example, in the work of [1] a second Higgs generation is generic among the heterotic vacua, and may even be more copious than single generation Higgs boson theories. It is also typical in this approach that there is a selection rule that allows only the first generation of Higgs bosons to couple to the fermions. We will review later why this aspect is very helpful for the viability of...

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Section: Overcoming Tree-level Flavor-changing Neutral Currentsmentioning

confidence: 97%

“…[10]. The SM value is ð3:51 AE 0:50Þ Â 10 À9 [10] and the current Tevatron upper bound at 95% C.L. is 5:8 Â 10 À8 [11].…”

Section: Overcoming Tree-level Flavor-changing Neutral Currentsmentioning

confidence: 99%

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Next generation Higgs bosons: Theory, constraints, and discovery prospects at the Large Hadron Collider

Gupta

Wells

2010

Phys. Rev. D

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“…There has been an intense discussion on how the flavour problem can be solved within the class of models with two or more Higgs doublets [13,14,15,16,17,18,19]. In a first step it is important to find conditions to avoid FCNC at the tree level.…”

Section: Introductionmentioning

confidence: 99%

Interpretation of charged Higgs effects in low energy flavour physics

Hurth¹

2011

Proceedings of Prospects for Charged Higgs Discovery at Colliders — PoS(Charged 2010)

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“…One possibility perused in [7][8][9][10] is to invoke flavour symmetries to restrict structure of FCNC couplings rather than eliminating them altogether. This leads to models with suppressed FCNC and additional phases whose phenomenological consequences have been studied in [11][12][13]. More economical possibility is to have models without tree level FCNC but additional phases in the charged Higgs couplings.…”

Section: Introductionmentioning

confidence: 99%

Fermion number conservation and two-Higgs-doublet models without tree-level flavor-changing neutral currents

Joshipura

Kodrani

2010

Phys. Rev. D

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The charged fermion mass matrices are always invariant under U (1) 3 symmetry linked to the fermion number transformation. A class of two Higgs doublet models (2HDM) can be identified by requiring that the definition of this symmetry in an arbitrary weak basis be independent of Higgs parameters such as the ratio of the Higgs vacuum expectation values. The tree level flavour changing neutral currents normally present in 2HDM are absent in this class of models but unlike the type I or type II Higgs doublet models, the charged Higgs couplings in these models contain additional flavour dependent CP violating phases. These phases can account for the recent hints of the beyond standard model CP violation in the B d and B s mixing. In particular, there is a range of parameters in which new phases do not contribute to the K meson CP violation but give identical new physics contribution to the B d and B s meson mixing. Specific model realizations of the above scenario are briefly discussed. * anjan@prl.res.in † bhavik@prl.res.in

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Higgs-induced flavor-changing neutral current as a source of new physics inb→stransitions

Cited by 8 publications

References 49 publications

Next generation Higgs bosons: Theory, constraints, and discovery prospects at the Large Hadron Collider

Next generation Higgs bosons: Theory, constraints, and discovery prospects at the Large Hadron Collider

Interpretation of charged Higgs effects in low energy flavour physics

Fermion number conservation and two-Higgs-doublet models without tree-level flavor-changing neutral currents

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