Hard hadronic diffraction is not hard

Kopeliovich, B. Z.; Pasechnik, Roman; Potashnikova, I. K.

doi:10.1142/s0218301316420015

Cited by 6 publications

(6 citation statements)

References 44 publications

(67 reference statements)

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“…Note that for the gap survival probabilities, we have assumed a constant value for Pomerons and Reggeons S SD = S CD 0.03. There have been several attempts to estimate those probabilities [6][7][8][9][22][23][24][25][26][27][28][29][30], but the actual values are rather uncertain. The chosen value of the gap survival factor can be considered a lower limit given the recent available experimental results [31,32].…”

Section: Hard Diffractive Di-jet Analysis With Fpmcmentioning

confidence: 99%

“…The presence of additional soft interactions between the colliding hadrons, which may fill the rapidity gap(s), is the standard interpretation of this factorization breaking, and there are empirical indications that it can be compensated by an overall factor, called the gap survival probability, roughly independent of the details of the hard process. In fact, the phenomenology of this factor is still a topic of intense debate [6][7][8][9] and it represents the last ingredient of the resolved-Pomeron model.At the LHC, a whole new set of experimental studies has started, in order to provide answers to a number of unsolved questions. Is the gap survival probability only a function of the collision energy, as often assumed?…”

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confidence: 99%

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Diffractive di-jet production at the LHC with a Reggeon contribution

et al. 2017

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We study hard diffractive scattering in hadron-hadron collisions including, on top of the standard Pomeron-initiated processes, contributions due to the exchange of Reggeons. Using a simple model to describe the parton content of the Reggeon, we compute di-jet production in single diffractive and central diffractive events. We show that Reggeon contributions can be sizable at the LHC, and even sometimes dominant, and we identify kinematic windows in which they could be experimentally studied. We argue that suitable measurements must be performed in order to properly constrain the model, and be able to correctly account for Reggeon exchanges in the analysis of the many hard diffractive observables to be measured at the LHC.Comment: 8 pages, 6 figures, version to be published in PL

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Section: Hard Diffractive Di-jet Analysis With Fpmcmentioning

confidence: 99%

mentioning

confidence: 99%

Diffractive di-jet production at the LHC with a Reggeon contribution

et al. 2017

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“…This rapidity gap can be washed out mainly by soft inelastic interaction that produces some secondary particles or re-scattering of leading hadron or hard QCD bremsstrahlung. There are several studies based on different models which predict this probability [81][82][83][84] with considerable uncertainties. It should be mentioned that the amount of this gap survival probability also depends on the assumed final state as well as the scale of the energy that considered processes are probed.…”

Section: Double Pomeron Exchange Processesmentioning

confidence: 99%

Pinning down the gauge boson couplings in WWγ production using forward proton tagging

Tizchang

Etesami

2020

J. High Energ. Phys.

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In this paper, we explore the potential of the LHC to measure the rate of pp → p W W γ p process, also to probe the new effective couplings contributing to the W W γ and W W γγ vertices. The analysis is performed at the √ s = 13 TeV, in the dileptonic decay channel, and assuming 300 fb −1 integrated luminosity (IL). In addition to the presence of two opposite sign leptons, a photon, and missing energy, the distinctive signature of this process is the presence of two intact protons flying few millimeters from the initial beam direction in both sides of interaction points which suppress the background process effectively. To exploit this feature of signal we benefit from forward detectors (FDs) placed about 200 meters from the interaction point to register the kinematics of tagged protons. In order to overcome the major sources of backgrounds, we introduced three categories of selection cuts dealing with objects that strike the central detector, protons hitting the FDs, and correlations of central objects and protons, respectively. We also evaluate the probability of pileup protons to be tagged in the FDs as a function of the mean number of pileup. Then the sensitivity of the LHC to observe this process and constraints on multi-boson effective couplings are extracted. The obtained expected limits show very good improvements for dimension-8 quartic couplings and competitive bounds on dimension-6 anomalous triple couplings w.r.t. the current experimental limits. Therefore, we propose this process to the LHC experiments as a sensitive and complementary channel to study the multi-gauge boson couplings.

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“…The gap survival probability relies on the specific collision, the cuts prescribed in the experiment and stands for the last element of the resolved-Pomeron model. A variety of attempts have been carried out to estimate those probabilities [70][71][72], however the actual values are rather uncertain. The selected value can be regarded a lower limit given the recent available experimental results [73,74].…”

Section: Gap Survival Probability In Diffractive Processesmentioning

confidence: 99%

Hard diffractive ηc,b hadroproduction at the LHC

2020

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In this paper, we investigate the inclusive diffractive hadroproduction for ηc and η b at the LHC energies. Based on the NRQCD factorization formalism and the resolved-Pomeron model for the quarkonium production mechanism, we estimate the rapidity, momentum fraction loss dependence of the cross section. We give prediction ratios for single and central diffractive processes with respect to non diffractive process. These inclusive processes are sensitive to gluon content of Pomeron for small-x and Reggeon for large-x, useful to study small and large-x physics and good to test different mechanism for ηc and η b production at the LHC. They also serve as the background to related exclusive processes thus should be predicted. Our results demonstrate that the Reggeon contribution of diffractive processes can be sizable, even sometimes dominant over Pomeron, and that its study can be useful to better constrain the Reggeon parton content. The experimental study of Reggeon can be carried out in certain kinematic windows.

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Hard hadronic diffraction is not hard

Cited by 6 publications

References 44 publications

Diffractive di-jet production at the LHC with a Reggeon contribution

Diffractive di-jet production at the LHC with a Reggeon contribution

Pinning down the gauge boson couplings in WWγ production using forward proton tagging

Hard diffractive ηc,b hadroproduction at the LHC

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