Can the Higgs be seen in rapidity gap events at the Tevatron or the LHC?

Хозе, В. А.; Martin, A. D.; Ryskin, M.G.

doi:10.1007/s100520000359

Cited by 201 publications

(383 citation statements)

References 24 publications

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“…ExHuME faithfully implements the theoretical approach to CEP detailed in [14,18]. 6 The a → τ + τ − decays are enforced using the PYTHIA event generator [26] and PYTHIA is also used for the subsequent τ decays.…”

Section: Simulating the Signal And Backgroundsmentioning

confidence: 99%

Reinstating the `no-lose' theorem for NMSSM Higgs discovery at the LHC

Forshaw¹,

Gunion²,

Hodgkinson³

et al. 2008

J. High Energy Phys.

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The simplest supersymmetric model that solves the µ problem and in which the GUT-scale parameters need not be finely tuned in order to predict the correct value of the Z boson mass at low scales is the Next-to-Minimal Supersymmetric Standard Model (NMSSM). However, in order that fine tuning be absent, the lightest CP-even Higgs boson h should have mass ∼ 100 GeV and SM couplings to gauge bosons and fermions. The only way that this can be consistent with LEP limits is if h decays primarily via h → aa → τ + τ − τ + τ − or 4j but not 4b, where a is the lighter of the two pseudo-scalar Higgses that are present in the NMSSM. Interestingly, m a < 2m b is natural in the NMSSM with m a > 2m τ somewhat preferred. Thus, h → τ + τ − τ + τ − becomes a key mode of interest. Meanwhile, all other Higgs bosons of the NMSSM are typically quite heavy. Detection of any of the NMSSM Higgs bosons at the LHC in this preferred scenario will be very challenging using conventional channels. In this paper, we demonstrate that the h → aa → τ + τ − τ + τ − decay chain should be visible if the Higgs is produced in the process pp → p + h + p with the final state protons being measured using suitably installed forward detectors. Moreover, we show that the mass of both the h and the a can be determined on an event-by-event basis.

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Section: Simulating the Signal And Backgroundsmentioning

confidence: 99%

Reinstating the `no-lose' theorem for NMSSM Higgs discovery at the LHC

Forshaw¹,

Gunion²,

Hodgkinson³

et al. 2008

J. High Energy Phys.

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“…The actual calculation of the hard scattering amplitude including Sudakov suppression is a challenging problem, which was addressed in various approximations in Refs. [35,36]. Fortunately, for our purposes we do not need to solve this problem at a fully quantitative level, as only a few qualitative aspects of the hard scattering process turn out to be essential for the physics of RGS.…”

Section: A Hard Scattering Processmentioning

confidence: 99%

Generalized parton distributions and rapidity gap survival in exclusive diffractiveppscattering

et al. 2007

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We propose a new approach to the problem of rapidity gap survival (RGS) in the production of high-mass systems (H = dijet, heavy quarkonium, Higgs boson) in double-gap exclusive diffractive pp scattering, pp → p + (gap) + H + (gap) + p. It is based on the idea that hard and soft interactions proceed over widely different time-and distance scales and are thus approximately independent. The high-mass system is produced in a hard scattering process with exchange of two gluons between the protons. Its amplitude is calculable in terms of the gluon generalized parton distributions (GPDs) in the protons, which can be measured in J/ψ production in exclusive ep scattering. The hard scattering process is modified by soft spectator interactions, which we calculate in a model-independent way in terms of the pp elastic scattering amplitude. Contributions from inelastic intermediate states are suppressed. A simple geometric picture of the interplay of hard and soft interactions in diffraction is obtained. The onset of the black-disk limit in pp scattering at TeV energies strongly suppresses diffraction at small impact parameters and is the main factor in determining the RGS probability. Correlations between hard and soft interactions (e.g. due to scattering from the long-range pion field of the proton, or due to possible short-range transverse correlations between partons) further decrease the RGS probability. We also investigate the dependence of the diffractive cross section on the transverse momenta of the final-state protons ("diffraction pattern"). By measuring this dependence one can perform detailed tests of the interplay of hard and soft interactions, and even extract information about the gluon GPD in the proton. Such studies appear to be feasible with the planned forward detectors at the LHC.

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“…The rapidity gap survival factor is an essential ingredient of the predictions [27] on exclusive diffractive Higgs production, which will be discussed in the last section. FIGURE 8.…”

Section: Qcd Factorization Testsmentioning

confidence: 99%

“…17. The cross section prediction for the production of a 120 GeV Higgs at 14 TeV is 3 fb, falling to 1 fb at 200 GeV [27]. 1 The simplest channel to observe the SM Higgs in the tagged proton approach from the experimental perspective is the WW decay channel [60,69].…”

Section: Towards the Lhcmentioning

confidence: 99%