Central exclusive meson production in the perturbative regime

Harland-Lang, L. A.; Khoze, V. A.; Ryskin, M. G.; Stirling, W. J.

doi:10.1063/1.4802104

Cited by 51 publications

(363 citation statements)

References 6 publications

Supporting

Mentioning

348

Contrasting

Order By: Relevance

“…If the singlet state is decoupled or absent altogether, the production of the triplet must be achieved entirely from electroweak processes, which are dominantly photon-photon fusion [38][39][40][41]. This is in mild tension with 8 TeV LHC results, because the cross section only scales by a factor of three from 8 to 13 TeV, and requires a large partial width ∼ 50 MeV.…”

Section: Andπmentioning

confidence: 99%

“…1 A key point of this work is 1 Single production of a pure EW triplet requires either photon [38][39][40][41] or vector boson fusion. These that in the presence of both a tripletπ 0 and a singlet stateη, the SM Higgs EWSB vev, v, inducesπ 0 -η mixing at O(v 2 ), opening up a sizable gluon fusion production channel for both neutral mass eigenstates in the triplet-singlet admixture.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Diphotons from electroweak triplet-singlet mixing

2016

View full text Add to dashboard Cite

The neutral component of a real pseudoscalar electroweak (EW) triplet can produce a diphoton excess at 750 GeV, if it is somewhat mixed with an EW singlet pseudoscalar. This triplet-singlet mixing allows for greater freedom in the diboson branching ratios than the singlet-only case, but it is still possible to probe the parameter space extensively with 300 fb −1 . The charged component of the triplet is pair-produced at the LHC, which results in a striking signal in the form of a pair of W γ resonances with an irreducible rate of 0.27 fb. Other signatures include multiboson final states from cascade decays of the triplet-singlet neutral states. A large class of composite models feature both EW singlet and triplet pseudo-Nambu Goldstone bosons in their spectrum, with the diboson couplings generated by axial anomalies.

show abstract

Section: Andπmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diphotons from electroweak triplet-singlet mixing

2016

View full text Add to dashboard Cite

show abstract

“…1). If we increase Γ γγ , we eventually approach the point where production through photon fusion [8][9][10][11][12][13] becomes important, and the estimate in (9) is no longer accurate. This is also the reason for the jump in the blue band for small values of Γ in .…”

Section: Importance Of the Widthmentioning

confidence: 99%

Rays of light from the LHC

et al. 2016

View full text Add to dashboard Cite

We consider models for the di-photon resonance observed at ATLAS (with 3.6 fb −1 ) and CMS (with 2.6 fb −1 ). We find there is no conflict between the signal reported at 13 TeV, and the constraints from both experiments at 8 TeV with 20.3 fb −1 . We make a simple argument for why the decay to γγ mode must be generated by additional, beyond the standard model (SM) states. We explore four viable options: (i): resonance production and decay through loops of messenger fermions or scalars; (ii): a resonant messenger which decays to the di-photon resonance + X; (iii): an edge configuration where A → Bγ → Cγγ, and (iv): Hidden Valley-like models where the resonance decays to a pair of very light (sub-GeV) states, each of which in turn decays to a pair of collimated photons that cannot be distinguished from a single photon. Since in each case multiple new states have been introduced, a wealth of signatures is expected to ensue at Run-2 of LHC.

show abstract

“…The pp → ppγγ process was discussed recently in [46]. No differential distributions have been discussed there.…”

Section: A Pp → Ppγγmentioning

confidence: 99%

QCD diffractive mechanism of exclusive pair production at high energies

2013

View full text Add to dashboard Cite

We discuss new diffractive mechanism of central exclusive production of W + W − pairs in protonproton collisions at the LHC. We include diagrams with intermediate virtual Higgs boson as well as quark box diagrams. Several observables related to this process are calculated. Predictions for the total cross section and differential distributions in W -boson rapidity and transverse momentum as well as W W invariant mass are presented. We also show results for different polarization states of the final W ± bosons. We compare the contribution of the γγ → W + W − mechanism considered in the literature with the contribution of the diffractive mechanism through the gg → W + W − subprocess for the different observables. The phase space integrated diffractive contribution when separated is only a small fraction of fb compared to 115.4 fb of the γγ-contribution without absorption. The latter contribution dominates at small four-momentum transfers squared in the proton lines and in a broad range of W + W − invariant masses. This offers a possibility of efficient searches for anomalous triple-boson (γW W ) and quartic-boson (γγW W ) couplings and testing models beyond the Standard Model. We discuss shortly also the pp → ppγγ process, where the box contribution is very similar to that for W + W − and compare our results with recent CDF data. Nice agreement has been achieved without additional free parameters.

show abstract

Central exclusive meson production in the perturbative regime

Cited by 51 publications

References 6 publications

Diphotons from electroweak triplet-singlet mixing

Diphotons from electroweak triplet-singlet mixing

Rays of light from the LHC

QCD diffractive mechanism of exclusive pair production at high energies

Contact Info

Product

Resources

About