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On the role of hard rescattering in exclusive diffractive Higgs production

High Energy Physics - Phenomenology · Submitted 28 Feb 2006 · 41 references

Pith's verdict: A defensive but mostly honest note: the new Regge-ratio estimate and HERA leading-neutron check are useful, but the main suppression argument leans on an explicitly conditional rapidity-threshold assumption.

T0 · AI review

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arXiv IDhep-ph/0602247 (version 2)
Pith IDX2AMUJZF, Pith's permanent record of this paper and its review
CitationA.D. Martin, M.G. Ryskin, V.A. Khoze. "On the role of hard rescattering in exclusive diffractive Higgs production." arXiv:hep-ph/0602247 (2006). https://pith.science/paper/X2AMUJZF
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Referee report
The paper

The paper claims

The paper argues that semi-enhanced hard rescattering will not appreciably reduce the exclusive diffractive Higgs production cross section at the LHC, preserving the event-rate estimate made in its Section 2.

The reading

This paper defends the predicted rate of exclusive diffractive Higgs production at the LHC, the process $pp \to p + H + p$ in which both protons survive and a Higgs boson is produced in the middle. A recent calculation claimed that a 'semi-enhanced' hard rescattering correction—an extra scattering of the exchanged gluons that could fill the rapidity gaps and suppress the signal—could be large; the authors argue it is small. The main theoretical reason is that the next-to-leading-logarithmic correction to the triple-Pomeron vertex (the coupling where three Pomeron exchanges meet) is equivalent to a rapidity threshold of about $\Delta Y = 2.3$, and a central Higgs heavier than about 140 GeV leaves less than twice that span at the LHC, so the correction cannot act. They add a phenomenological check: HERA data on leading-neutron production show the analogous gap survival probability is flat over a factor of ten in photon energy, which would not hold if the semi-enhanced correction were large. If the paper is right, the estimated exclusive Higgs event rate stands, and forward proton tagging remains a viable way to measure the Higgs mass cleanly.

What carries the argument

The central object is the semi-enhanced diagram of Fig. 1(d): a second Pomeron (a color-singlet gluonic exchange) emitted from one proton rescatters off an intermediate parton of the other proton's gluon ladder through the triple-Pomeron vertex $V_{3P}$, adding an integration over the rapidity of that vertex. The suppression mechanism is the $\Delta Y$ threshold: comparing the NLL correction to the hard Pomeron intercept, $\omega^{NLL} \simeq \omega_0(1 - 6.2\alpha_s)$, with the threshold form $\omega = \omega_0 e^{-\omega_0 \Delta Y}$, gives $\Delta Y = 6.2/((4\ln 2)N_c/\pi) \simeq 2.3$. Since both rapidity intervals bordering the vertex must exceed $\Delta Y$, the contribution only turns on when $\delta y = \ln(\sqrt{s}/M_H) > 2\Delta Y$, which fails at the LHC for $M_H > 140$ GeV. The second piece of machinery is the analogy to pion-exchange leading-neutron production at HERA: the measured gap-survival probability is flat over more than a factor of ten in photon energy, providing a phenomenological bound on the same class of semi-enhanced rescattering.

Extended reading notes

Core claim

The paper's central claim is that semi-enhanced hard rescattering corrections to central exclusive Higgs production $pp \to p + H + p$ at the LHC are small and will not appreciably affect the cross section estimate of Section 2. The decisive argument is kinematic: if the next-to-leading-logarithmic (NLL) correction to the triple-Pomeron vertex acts as a threshold $\Delta Y = 2.3$, then the semi-enhanced diagram needs the interval between the proton and the Higgs in rapidity to exceed $2\Delta Y \simeq 4.6$; at $\sqrt{s}=14$ TeV, $\delta y = \ln(\sqrt{s}/M_H)$ is below $4.6$ for $M_H > 140$ GeV, so the correction has no room to act. Supporting arguments are that the low-$x$, low-$Q^2$ gluon density appears to fall rather than rise, that the perturbative expansion in the saturation region is unreliable and higher Reggeon graphs reduce the effective triple-Pomeron vertex, and that a Regge-ratio estimate gives $\sigma_H^{(d)}/\sigma_H^{(b)} \simeq 0.1$. The paper then cites HERA leading-neutron data, where the analogous pion-exchange gap survives with a probability independent of photon energy, as direct experimental evidence that the semi-enhanced correction is small.

Load-bearing premise

The argument assumes an unknown quantum correction to the key three-gluon coupling behaves as a hard threshold requiring two interaction vertices to be separated by at least about 2.3 units of rapidity; if that threshold is wrong, the suppression on which the paper relies can disappear.

Editorial extensions

If this is right

  • The exclusive process $pp \to p + H + p$ keeps the Section 2 cross section estimate, roughly $10^{-4}$ of the inclusive Higgs rate, so the expected handful of events at $60$ fb$^{-1}$ remains the benchmark for LHC searches.
  • For $M_H > 140$ GeV the semi-enhanced correction is below the $\Delta Y$ threshold, so the central prediction and its stated uncertainty stand; the gap survival factor $\hat{S}^2 \simeq 0.026$ is not further reduced.
  • Energy-flat leading-neutron survival at HERA gives an empirical anchor: any future measurement of exclusive production at the LHC can be compared with the uncorrected prediction without inserting an additional suppression parameter.
  • At a higher-energy proton-proton collider the interval $\ln(\sqrt{s}/M_H)$ would eventually exceed $2\Delta Y$, so the semi-enhanced correction should turn on and visibly suppress exclusive production, a distinctive energy dependence that follows directly from the threshold mechanism.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The threshold mechanism predicts a mass-dependent turn-on: at a fixed collider energy, exclusive production of states heavier than roughly $M \sim \sqrt{s}\, e^{-2\Delta Y}$ should start to be suppressed; measuring exclusive production of quarkonia or other masses could map the threshold.
  • The double-counting argument implies that combining the eikonal $\hat{S}^2$ with a separately computed semi-enhanced correction would over-subtract; a consistent treatment should remove the enhanced rescattering already folded into the phenomenological soft amplitude.
  • The HERA flatness argument is qualitative; a quantitative fit to the energy dependence of leading-neutron production could set an upper bound on the effective triple-Pomeron vertex and propagate that bound into the uncertainty of the exclusive Higgs cross section.
Original abstract

We discuss the contribution of so-called semi-enhanced hard rescattering corrections to central exclusive diffractive Higgs production, pp -> p+H+p, at the LHC. We present arguments to show that these corrections are small. We confirm these expectations by considering HERA data for leading neutron production.

The compiled record

The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 2,845 input tokens, $0.0001 reported.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.31 · human participants 0.02 · controlled comparison 0.10 · randomized assignment 0.01 · states quantitative result 0.06 · compares with prior results 0.46 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; .

We discuss the contribution of so-called semi-enhanced hard rescattering corrections to central exclusive diffractive Higgs production, pp -> p+H+p, at the LHC. We present arguments to show that these corrections are small. We confirm these expectations by considering HERA data for leading neutron production.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 We discuss the contribution of so-called semi-enhanced hard rescattering corrections to central exclusive diffractive Higgs production, pp -> p+H+p, at the LHC. contribution 0.94 0.48 0.05 unclear 0.73
s1 We present arguments to show that these corrections are small. result 0.86 0.73 0.82 asserted 0.98
s2 We confirm these expectations by considering HERA data for leading neutron production. method 0.51 0.81 0.10 asserted 1.00

What kind of paper the classifier reports this is: theoretical result 0.54 · evidence from analysis of existing data 0.81.

What was examined, and what was not

sources read
  • arXiv listing abstract v2
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

Figures
Figure 1. Schematic diagrams for central exclusive Higgs productio
Figure 2. The leading Reggeon contributions to the total and the sin

Figures reproduced from arXiv:hep-ph/0602247 by the authors.

References
How the literature uses it

8 arXiv papers cite this in 12 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers whose main result relates to this one's

Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

States a conflicting result 1 paper

Papers citing it · 8 sentences without a confident label

Uses its method or tool 1 paper
Cites it as support 1 paper
Cites it as background 2 papers

Discussion

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