Diphoton excess at 750 GeV: gluon–gluon fusion or quark–antiquark annihilation?

Gao, Jun; Zhang, Hao; Zhu, Hua Xing

doi:10.1140/epjc/s10052-016-4200-z

Cited by 15 publications

(9 citation statements)

References 123 publications

(79 reference statements)

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“…This was discussed in ref. [41] which proposed the average p T of as a good discriminator. In this analysis, and throughout the whole article, we are implicitly assuming that higher order terms in the EFT expansion are under control also for processes that can potentially probe the high-energy region, such as j or jj associated production.…”

Section: Four-body Decaysmentioning

confidence: 99%

“…The rapidity distribution and the transverse momentum spectrum of the diphoton system retain features of the initial parton state and can be used to discriminate between light-quark and gluon or heavy-quark initiated productions [41].…”

Section: Identifying the Initial Statementioning

confidence: 99%

“…For the b-quark initial state the ratio σ b /σ is 6.2%, whereas for all other initial states it is less than 1%, see table 1. Thus, b associated production is an excellent indicator of b-quark initial states [41].…”

Section: Identifying the Initial Statementioning

confidence: 99%

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Digamma, what next?

Franceschini

Giudice

Kamenik

et al. 2016

J. High Energ. Phys.

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If the 750 GeV resonance in the diphoton channel is confirmed, what are the measurements necessary to infer the properties of the new particle and understand its nature? We address this question in the framework of a single new scalar particle, called digamma ( ). We describe it by an effective field theory, which allows us to obtain general and model-independent results, and to identify the most useful observables, whose relevance will remain also in model-by-model analyses. We derive full expressions for the leading-order processes and compute rates for higher-order decays, digamma production in association with jets, gauge or Higgs bosons, and digamma pair production. We illustrate how measurements of these higher-order processes can be used to extract couplings, quantum numbers, and properties of the new particle.

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Section: Four-body Decaysmentioning

confidence: 99%

Section: Identifying the Initial Statementioning

confidence: 99%

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Digamma, what next?

Franceschini

Giudice

Kamenik

et al. 2016

J. High Energ. Phys.

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“…We compute the scaling for our model as a function of the VLQ mass (the scaling is independent of the couplings) and assuming the K-factor is constant from 8 to 13 TeV. The results are shown in figure 4 alongside the scaling of other proposed models, including gluon fusion, qq production [28], and photon fusion [29][30][31]. The upmixing model inherits the scaling from the uū production at m V ∼ 750 GeV but grows with the mass of the VLQ due to the higher center-of-mass energy.…”

Section: Eliminating Tension With 8 Tev Datamentioning

confidence: 99%

Novel kinematics from a custodially protected diphoton resonance

et al. 2016

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We study a simple, well-motivated model based on a custodial symmetry which describes the tree-level production of a 750 GeV diphoton resonance from a decay of a singly produced vectorlike quark. The model has several novel features. The identification of the resonance as an SU(2)R triplet provides a symmetry explanation for suppression of its decays to hh, W W , and gg. Moreover, the ratio of the 13 TeV to 8 TeV cross sections can be larger than single production of a 750 GeV resonance, reaching ratios of up to 7 for TeV scale vector-like quark masses. This eliminates any tension between the results from Run I and Run II diphoton searches. Lastly, we study the kinematics of our signal and conclude that the new production mechanism is consistent with available experimental distributions in large regions of parameter space but, depending on the mass of the new vector-like quarks, can be differentiated from the background with more statistics.

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“…Thus, the scalar S produced via gluon-fusion will have a distinctive signature at the LHC in the diphoton channel. Early hints of an excess in this channel for a resonance at 750 GeV in the first 13 TeV energy run at the Large Hadron Collider (LHC), reinforced by the reanalysis of the 8 TeV Run [13][14][15][16][17][18], have motivated a host of dedicated studies both for the cases of the new resonance being a spin zero or two [10,[19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Uncoloured states were also considered as they can also lead to a large enough diphoton cross section by only increasing the diphoton partial width [22], albeit with S couplings dangerously approaching the non-perturbative regime [33,34].…”

Section: Introductionmentioning

confidence: 99%

Implications of a high-mass diphoton resonance for heavy quark searches

Banerjee

Barducci

Bélanger

et al. 2016

J. High Energ. Phys.

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Heavy vector-like quarks coupled to a scalar S will induce a coupling of this scalar to gluons and possibly (if electrically charged) photons. The decay of the heavy quark into Sq, with q being a Standard Model quark, provides, if kinematically allowed, new channels for heavy quark searches. Inspired by naturalness considerations, we consider the case of a vector-like partner of the top quark. For illustration, we show that a singlet partner can be searched for at the 13 TeV LHC through its decay into a scalar resonance in the 2γ + + X final states, especially if the diphoton branching ratio of the scalar S is further enhanced by the contribution of non coloured particles. We then show that conventional heavy quark searches are also sensitive to this new decay mode, when S decays hadronically, by slightly tightening the current selection cuts. Finally, we comment about the possibility of disentangling, by scrutinising appropriate kinematic distributions, heavy quark decays to St from other standard decay modes.

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Diphoton excess at 750 GeV: gluon–gluon fusion or quark–antiquark annihilation?

Cited by 15 publications

References 123 publications

Digamma, what next?

Digamma, what next?

Novel kinematics from a custodially protected diphoton resonance

Implications of a high-mass diphoton resonance for heavy quark searches

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