Interpreting 750 GeV diphoton excess with <i>R</i>-parity violating supersymmetry

Ding, Ran; Huang, Li; Li, Tianjun; Zhu, B.

doi:10.1142/s0217751x17500142

Cited by 12 publications

(16 citation statements)

References 75 publications

(23 reference statements)

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“…Thus far no valid parameter point has been found which is in agreement with both the diphoton rate and vacuum stability constraints. Similar issues were observed in models with trilinear R-parity violation [12,165] which are disfavoured by these constraints and might work only in very fine-tuned parameter regions.…”

Section: Large Couplings To Scalarssupporting

confidence: 59%

Precision tools and models to narrow in on the 750 GeV diphoton resonance

et al. 2016

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The hints for a new resonance at 750 GeV from ATLAS and CMS have triggered a significant amount of attention. Since the simplest extensions of the standard model cannot accommodate the observation, many alternatives have been considered to explain the excess. Here we focus on several proposed renormalisable weakly-coupled models and revisit results given in the literature. We point out that physically important subtleties are often missed or neglected. To facilitate the study of the excess we have created a collection of 40 model files, selected from recent literature, for the Mathematica package SARAH. With SARAH one can generate files to perform numerical studies using the tailormade spectrum generators FlexibleSUSY and SPheno. These have been extended to automatically include crucial higher order corrections to the diphoton and digluon decay rates for both CP-even and CP-odd scalars. Additionally, we have extended the UFO and CalcHep interfaces of SARAH, a

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Section: Large Couplings To Scalarssupporting

confidence: 59%

Precision tools and models to narrow in on the 750 GeV diphoton resonance

et al. 2016

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“…In many models the decay of the diphoton resonance is mediated via an intermediate loop formed of sleptons [57,58], vector quark or leptons [59] or fermions [3]. For illustration we will consider the fermion case in what follows, although similar results may be found for other particle types.…”

Section: Production Of Colourless Fermion Pairsmentioning

confidence: 93%

The production of a diphoton resonance via photon-photon fusion

Harland–Lang

Khoze

Ryskin

2016

J. High Energ. Phys.

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Motivated by the recent LHC observation of an excess of diphoton events around an invariant mass of 750 GeV, we discuss the possibility that this is due to the decay of a new scalar or pseudoscalar resonance dominantly produced via photon-photon fusion. We present a precise calculation of the corresponding photon-photon luminosity in the inclusive and exclusive scenarios, and demonstrate that the theoretical uncertainties associated with these are small. In the inclusive channel, we show how simple cuts on the final state may help to isolate the photon-photon induced cross section from any gluongluon or vector boson fusion induced contribution. In the exclusive case, that is where both protons remain intact after the collision, we present a precise cross section evaluation and show how this mode is sensitive to the parity of the object, as well as potential CP -violating effects. We also comment on the case of heavy-ion collisions and consider the production of new heavy colourless fermions, which may couple to such a resonance.

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“…Neither the Minimal Supersymmetric Standard Model (MSSM) nor its extension to include a gauge singlet chiral multiplet can account for the resonance (see, however, [5,6]). In this paper we show that a simple addition to the theory, that maintains supersymmetric gauge coupling unification at M G ∼ 2 × 10 16 GeV, can account for the resonance and leads to new vector-like quarks, with masses below 1 TeV in the vast majority of parameter space, and couplings predicted from the infrared behavior of renormalization group equations.…”

Section: Jhep03(2016)017mentioning

confidence: 99%

750 GeV diphotons: implications for supersymmetric unification

Hall

Harigaya

Nomura

2016

J. High Energ. Phys.

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A recent signal of 750 GeV diphotons at the LHC can be explained within the framework of supersymmetric unification by the introduction of vector quarks and leptons with Yukawa couplings to a singlet S that describes the 750 GeV resonance. We study the most general set of theories that allow successful gauge coupling unification, and find that these Yukawa couplings are severely constrained by renormalization group behavior: they are independent of ultraviolet physics and flow to values at the TeV scale that we calculate precisely. As a consequence the vector quarks and leptons must be light; typically in the region of 375 GeV to 700 GeV, and in certain cases up to 1 TeV. The 750 GeV resonance may have a width less than the experimental resolution; alternatively, with the mass splitting between scalar and pseudoscalar components of S arising from oneloop diagrams involving vector fermions, we compute an apparent width of 10s of GeV. We take the resonance to be the scalar component of a gauge singlet chiral multiplet S. Production and decay of S is accomplished by coupling to TeV-scale multiplets Φ i andΦ i , so that the effective theory below M G is described by Keywords: Supersymmetry PhenomenologyTo preserve precision supersymmetric gauge coupling unification, we study theories where Φ i andΦ i form complete multiplets of SU (5). We study the complete set of such theories: the "(5 + 5) N 5 " theory containing N 5 = 1, 2, 3 or 4 copies of (D,L) + (D, L), the "10 + 10" theory containing (Q, U, E) + (Q,Ū ,Ē), and the "15 + 15" theory that contains a full generation of vector quarks and leptons. In the (5 + 5) 4 and 15 + 15 theories, the standard model gauge couplings near M G are in the strong coupling regime, so they correspond to the scenario of strong "unification" [17,18], rather than precision perturbative unification, which applies to the other theories. The parameters µ S and µ i are assumed to be of order the TeV scale, with an origin that may be similar to that of the supersymmetric Higgs mass parameter. Any S 3 coupling in the superpotential is assumed to be sufficiently small not to affect our analysis. The effective theory of eq. (1) possesses a parity on the vector matter, so that the lightest Φ i is stable. We therefore add Yukawa interactions between these vector quarks and leptons and the standard model quarks and leptons via the MSSM Higgs doublets; this can be done without violating R-parity if Φ i andΦ i are R-parity odd. We take these couplings to be sufficiently small that they do not affect the production and decay of the 750 GeV resonance, and do not violate bounds on flavor-changing processes. This allows the vector quarks and leptons to have prompt decays to known quarks and leptons with the emission of W, Z or h, the 125 GeV Higgs boson. (An alternative possibility will be discussed at the end of the paper.)Soft supersymmetry breaking masses for the scalar components of S, Φ i ,Φ i are present, as well as A and B type soft trilinears and bilinears. For simplicity, these paramet...

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Interpreting 750 GeV diphoton excess with R-parity violating supersymmetry

Cited by 12 publications

References 75 publications

Precision tools and models to narrow in on the 750 GeV diphoton resonance

Precision tools and models to narrow in on the 750 GeV diphoton resonance

The production of a diphoton resonance via photon-photon fusion

750 GeV diphotons: implications for supersymmetric unification

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