Up asymmetries from exhilarated composite flavor structures

Rold, Leandro Da; Delaunay, Cédric; Grojean, Christophe; Pérez, Gilad

doi:10.1007/jhep02(2013)149

Cited by 28 publications

(35 citation statements)

References 181 publications

(306 reference statements)

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“…The ATLAS Collaboration, in fact, recently presented new experimental techniques designed to tag charm jets at the LHC [6]. The possibility to apply charm tagging, beyond its plain interest from the SM perspective [7,8], also opens new possibilities to analyze various beyond the SM signals [9][10][11][12]. In particular we show in this paper how crucial charm tagging may be in order to exhume the associated Higgs production signal in the case of a suppressed h → bb branching ratio due to an enhanced Higgs-to-charm coupling relative to the SM.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Higgs boson coupling to charm pairs

et al. 2014

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We show that current Higgs data permit a significantly enhanced Higgs coupling to charm pairs, comparable to the Higgs-to-bottom pairs coupling in the Standard Model, without resorting to additional new physics sources in Higgs production. With a mild level of the latter current data even allow for the Higgs-to-charm pairs to be the dominant decay channel. An immediate consequence of such a large charm coupling is a significant reduction of the Higgs signal strengths into the known final states as in particular into bottom pairs. This might reduce the visible vector-boson associated Higgs production rate to a level that could compromise the prospects of ever observing it. We however demonstrate that a significant fraction of this reduced signal can be recovered by jet-flavor tagging targeted towards charm-flavored jets. Finally we argue that an enhanced Higgs-to-charm pairs coupling can be obtained in various new physics scenarios in the presence of only a mild accidental cancellation between various contributions.

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Section: Introductionmentioning

confidence: 99%

Enhanced Higgs boson coupling to charm pairs

et al. 2014

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“…Sizable dijet contributions arise in the presence of a light color octet vector resonance in the effective theory [31,32,35,37]. Even if such a state is absent, as assumed here, new physics dijet sources are generically induced by unknown physics at the cut-off scale Λ ∼ 4πf .…”

Section: Indirect Constraints From Dijet Productionmentioning

confidence: 78%

“…This possibility leads to a series of interesting experimental consequences which have been partially discussed in ref. [31,32,[34][35][36][37]. We focus here on analysing signals which could be already probed by direct searches at the LHC.…”

Section: Jhep02(2014)055mentioning

confidence: 99%

“…(4.2), we follow the procedure of ref. [35] and derive approximate lower bounds by demanding that the χ j distributions for various dijet mass bins do not deviate from SM expectations more than in the presence of Notice that LHC experiments collected dijet events of invariant masses up to ≃ 4 TeV. The effective description breaks down at a scale of at most O(4π/ √ c).…”

Section: Jhep02(2014)055mentioning

confidence: 99%

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Light non-degenerate composite partners at the LHC

Delaunay

Flacke

González-Fraile

et al. 2014

J. High Energ. Phys.

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Abstract:We study the phenomenological implications of a large degree of compositeness for the light generation quarks in composite pseudo-Nambu-Goldstone-boson Higgs models. We focus in particular on phenomenologically viable scenarios where the right-handed uptype quarks have a sizable mixing with the strong dynamics. For concreteness we assume the latter to be characterized by an SO(5)/SO(4) symmetry with fermionic resonances in the SO(4) singlet and fourplet representations. Singlet partners dominantly decay to a Higgs boson and jets. Since no dedicated searches are currently looking for these final states, singlet partners can still be rather light. Conversely, some fourplet partner components dominantly decay to an electroweak gauge boson and a jet, a type of signature which has been analysed at the LHC. We have reinterpreted various ATLAS and CMS analyses in order to constrain the parameter space of this class of models. In the limit of first two generation degeneracy, as in minimal flavor violation or U(2)-symmetric flavor models, fourplet partners need to be relatively heavy, with masses above 1.8 TeV, or the level of compositeness needs to be rather small. The situation is significantly different in models which deviate from the first two generation degeneracy paradigm, as charm quark parton distribution functions are suppressed relative to the up quark ones. We find that JHEP02 (2014)055 the right-handed charm quark component can be mostly composite together with their partners being as light as 600 GeV, while the right-handed up quark needs either to be mostly elementary or to have partners as heavy as 2 TeV. Models where right-handed uptype quarks are fully composite fermions are also analysed and yield qualitatively similar conclusions. Finally, we consider the case where both the fourplet and the singlet states are present. We demonstrate that in this case the fourplet bounds could be significantly weaken due to a combination of smaller production rates and the opening of new channels including cascade processes.

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“…[17] have proposed a symmetry to supress the main contributions to ǫ K in anarchic partial compositeness, however ref. [18] has shown that the suppression is spoiled once quark masses are taken into account. Ref.…”

Section: Jhep10(2017)120mentioning

confidence: 99%

Anarchy with linear and bilinear interactions

Rold

2017

J. High Energ. Phys.

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Composite Higgs models with anarchic partial compositeness require a scale of new physics O(10 − 100) TeV, with the bounds being dominated by the dipole moments and ǫ K . The presence of anarchic bilinear interactions can change this picture. We show a solution to the SM flavor puzzle where the electron and the Right-handed quarks of the first generation have negligible linear interactions, and the bilinear interactions account for most of their masses, whereas the other chiral fermions follow a similar pattern to anarchic partial compositeness. We compute the bounds from flavor and CP violation and show that neutron and electron dipole moments, as well as ǫ K and µ → eγ, are compatible with a new physics scale below the TeV. ∆F = 2 operators involving Left-handed quarks and ∆F = 1 operators with d L give the most stringent bounds in this scenario. Their Wilson coefficients have the same origin as in anarchic partial compositeness, requiring the masses of the new states to be larger than O(6 − 7) TeV.

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Up asymmetries from exhilarated composite flavor structures

Cited by 28 publications

References 181 publications

Enhanced Higgs boson coupling to charm pairs

Enhanced Higgs boson coupling to charm pairs

Light non-degenerate composite partners at the LHC

Anarchy with linear and bilinear interactions

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