Using rapidity gaps to distinguish between Higgs boson production byWand gluon fusion

Abstract

The possibility of distinguishing between two higgs production mechanisms, W fusion and gluon fusion, due to rapidity gap existence is investigated using the Monte Carlo event generator PYTHIA. It is shown that, considering the designed CM energy and luminosity for the LHC, it is not possible to distinguish between the two higgs production processes as, for a given integrated luminosity, they lead to the same number of events containing a rapidity gap.

The rapidity gap Higgs signal at LHC

“…Of course, there is also a suppression of rapidity gap events due to parton-parton rescattering and to the possibility of multiple (or 'pile-up') interactions at high luminosities [3,4,6,15]. For example, a rough estimate of the former suppression is [16] [1 − 2(σ el + σ SD )/σ tot ] 2 ∼ 1 − 10% depending on the value of the cross section, σ SD , for single diffraction.…”

Graviton Signals in Central Production at the LHC

“…If we increase , the signal crosssections decrease as usual. In our case, the signal falls off very rapidly with increasing because of the presence of 8 in the denominator of the signal cross-sections (see (12) and (16)). This makes the ADD model very difficult to search for experimentally.…”

“…We plot signal / for = 1.5, 2.0, and 2.5 TeV taking = 2 and Δ = 2 for both signal and background. The signal / is a monotonically increasing function of ( 2 =̂) because the subprocess cross-section increases roughly aŝ3 (see (12)). The background cross-section is computed only considering the dominant → channel.…”

“…For dilepton production, the angular distributions for signal and background show a very contrasting behavior. For signal / cos ∼ (1 − cos 4 ) (see (12)) which attains its maximum at cos = 0. On the other hand, background attains its minimum at cos = 0 since it goes as (1 + cos 2 )/sin 2 and diverges when | cos | → 1 (see (C.5)).…”

A review of forward proton tagging at 420m at the LHC, and relevant results from the Tevatron and HERA

“…This approach has been shown not only to describe a wide range of HERA data, but also the double diffractive dijet production data from the CDF Collaboration [13,18], if a 'gap survival factor' is included to account for the fact that multi-parton interactions in proton-antiproton collisions will reduce the observed rate of double pomeron collisions. This factor can be extracted from data, by scaling the absolute predictions derived using the H1 diffractive structure functions [19], or calculated using phenomenological approaches of varying degrees of sophistication, but in general based on eikonal methods and total cross section measurements [20,21,22,23,24,25]. It is the latter calculational approach that Khoze et al use to estimate the gap survival probability in their central exclusive predictions.…”