Higgs hadroproduction at large Feynman x

Hadronic diffractive processes characterised by a hard scale (hard diffraction) contain a nontrivial interplay of hard and soft, nonperturbative interactions, which breaks down factorisation of short and long distances. On the contrary to the expectations based on the factorization hypothesis, assuming that hard diffraction is a higher twist, these processes should be classified as a leading twist. We overview various implications of this important observation for diffractive radiation of Abelian (Drell-Yan, gauge bosons, Higgs boson) and non-Abelian (heavy flavors) particles, as well as direct coalescence into the Higgs boson of the non-perturbative intrinsic heavy flavour component of the hadronic wave function.

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“…Such exclusive Higgs production process, pp → Hpp was analysed in Refs. [45,46]. The diffractive cross section has the form,…”

Section: Direct Heavy Flavour Fusionmentioning

confidence: 99%

Hard hadronic diffraction is not hard

Kopeliovich

Pasechnik²,

Potashnikova

2016

Int. J. Mod. Phys. E

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“…However, the Higgs can also be produced at very high x F by the process [QQ] + g → H, 34 where both heavy quarks from the proton's five quark Fock state |uudQQ couple directly to the Higgs. See Fig.…”

Section: 30mentioning

confidence: 99%

The renormalization scale problem and novel perspectives for QCD

Brodsky

2015

Int. J. Mod. Phys. Conf. Ser.

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I discuss a number of novel tests of QCD, measurements which can illuminate fundamental features of hadron physics. These include the origin of the "ridge" in proton-proton collisions; the production of the Higgs at high x F ; the role of digluon-initiated processes for quarkonium production; flavor-dependent anti-shadowing; the effect of nuclear shadowing on QCD sum rules; direct production of hadrons at high transverse momentum; and leading-twist lensing corrections; and the breakdown of perturbative QCD factorization. I also review the "Principle of Maximum Conformalit" (PMC) which systematically sets the renormalization scale order-by-order in pQCD, independent of the choice of renormalization scheme, thus eliminating an unnecessary theoretical uncertainty.

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“…Goldhaber, Kopeliovich, Schmidt, Soffer, and I [25,34] have proposed a novel mechanism for exclusive diffractive Higgs production pp → pH p and nondiffractive Higgs production in which the Higgs boson carries a significant fraction of the projectile proton momentum. The production mechanism is based on the subprocess (QQ)g → H where the QQ in the |uudQQ > intrinsic heavy quark Fock state has up to 80% of the projectile protons momentum.…”

Section: Novel Heavy Quark Phenomenamentioning

confidence: 99%

Dynamic versus Static Structure Functions and Novel Diffractive Effects in QCD

Brodsky¹

2009

AIP Conference Proceedings

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Abstract. Initial-and final-state rescattering, neglected in the parton model, have a profound effect in QCD hard-scattering reactions, predicting single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, the breakdown of the Lam Tung relation in DrellYan reactions, and nuclear shadowing and non-universal antishadowing-leading-twist physics not incorporated in the light-front wavefunctions of the target computed in isolation. I also discuss the use of diffraction to materialize the Fock states of a hadronic projectile and test QCD color transparency, and anomalous heavy quark effects. The presence of direct higher-twist processes where a proton is produced in the hard subprocess can explain the large proton-to-pion ratio seen in high centrality heavy ion collisions. I emphasize the importance of distinguishing between static observables such as the probability distributions computed from the square of the light-front wavefunctions versus dynamical observables which include the effects of rescattering. NOVEL FEATURES OF DIFFRACTIVE DEEP INELASTIC SCATTERINGA remarkable feature of deep inelastic lepton-proton scattering at HERA is that approximately 10% events are diffractive [1,2]: the target proton remains intact, and there is a large rapidity gap between the proton and the other hadrons in the final state. This observation presents a paradox: if one chooses the conventional parton model frame, the virtual photon interacts with a quark constituent with light-cone momentum fraction x = k + /p + = x b j . Furthermore, the gauge link associated with the struck quark (the Wilson line) becomes unity in light-cone gauge A + = 0. Thus the struck "current" quark apparently experiences no final-state interactions. Since the light-front wavefunctions ψ n (x i , k ⊥i ) of a stable hadron are real, it appears impossible to generate the required imaginary phase associated with pomeron exchange, let alone large rapidity gaps. This paradox was resolved by Hoyer, Marchal, Peigne, Sannino and myself [3]. Consider the case where the virtual photon interacts with a strange quark-the ss pair is assumed to be produced in the target by gluon splitting. In the case of Feynman gauge, the struck s quark continues to interact in the final state via gluon exchange as described by the Wilson line. The final-state interactions occur at a light-cone time ∆τ 1/ν shortly after the virtual photon interacts with the struck quark. When one integrates over the nearly-on-shell intermediate state, the amplitude acquires an imaginary part. Thus the rescattering of the quark produces a separated color-singlet ss and an imaginary phase.

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Higgs hadroproduction at large Feynman x

Cited by 40 publications

References 34 publications

Hard hadronic diffraction is not hard

Hard hadronic diffraction is not hard

The renormalization scale problem and novel perspectives for QCD

Dynamic versus Static Structure Functions and Novel Diffractive Effects in QCD

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