Novel QCD Phenomena at the LHC: The Ridge, Digluon-Initiated Subprocesses, Direct Reactions, Non-Universal Antishadowing, and Forward Higgs Production

Brodsky, Stanley J.

doi:10.1016/j.nuclphysbps.2015.01.007

Cited by 9 publications

(7 citation statements)

References 101 publications

(121 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A dramatic consequence of IQ: Higgs boson production at high x F > 0.8 at the ISR. This is supported by the measurement of J/ψ by Badier et al (NA3) and even double J/ψ hadroproduction at high x F [41,42,60].…”

Section: Theoreticasupporting

confidence: 60%

The physics of heavy quark distributions in hadrons: Collider tests

Brodsky

Bednyakov

Lykasov

et al. 2017

Progress in Particle and Nuclear Physics

View full text Add to dashboard Cite

We present a review of the current understanding of the heavy quark distributions in the nucleon and their impact on collider physics. The origin of strange, charm and bottom quark pairs at high light-front (LF) momentum fractions in hadron wavefunctions -the "intrinsic" quarks, is reviewed. The determination of heavy-quark parton distribution functions (PDFs) is particularly significant for the analysis of hard processes at LHC energies. We show that a careful study of the inclusive production of open charm and the production of γ/Z/W particles, accompanied by the heavy jets at large transverse momenta can give essential information on the intrinsic heavy quark (IQ) distributions. We also focus on the theoretical predictions concerning other observables which are very sensitive to the intrinsic charm contribution to PDFs including Higgs production at high x F and novel fixed target measurements which can be tested at the LHC.

show abstract

Section: Theoreticasupporting

confidence: 60%

The physics of heavy quark distributions in hadrons: Collider tests

Brodsky

Bednyakov

Lykasov

et al. 2017

Progress in Particle and Nuclear Physics

View full text Add to dashboard Cite

show abstract

“…There is work currently underway to follow up on an earlier study [237] that suggests anti-shadowing is the constructive interference analog of the shadowing effect. These authors also suggest that antishadowing is not universal but rather quark-flavor dependent [238], which also suggests the idea of antishadowing is different depending on the interaction being examined.…”

Section: • and The Fermi Motion Region-r[f Amentioning

confidence: 97%

Neutrino(antineutrino)–nucleus interactions in the shallow- and deep-inelastic scattering regions

Athar

Morfín

2021

J. Phys. G: Nucl. Part. Phys.

View full text Add to dashboard Cite

In ν/ν-Nucleon/Nucleus interactions Shallow Inelastic Scattering (SIS) is technically defined in terms of the four-momentum transfer to the hadronic system as non-resonant meson production with Q 2 1 GeV 2. This non-resonant meson production intermixes with resonant meson production in a regime of similar effective hadronic mass W of the interaction. As Q 2 grows and surpasses this ≈ 1 GeV 2 limit, non-resonant interactions begin to take place with quarks within the nucleon indicating the start of Deep Inelastic Scattering (DIS). To essentially separate this resonant plus non-resonant meson production from DIS quark-fragmented meson production, a cut of 2 GeV in W of the interactions is generally introduced. However, since experimentally mesons from resonance decay cannot be separated from non-resonant produced mesons, SIS for all practical purposes in this review has been defined as inclusive meson production that includes non-resonant plus resonant meson production and the interference between them. Experimentally then for W 2 GeV inclusive meson production with W (M N + M π) and all Q 2 is here defined as SIS, while for W 2 GeV, the kinematic region with Q 2 1 GeV 2 is defined as DIS. The so defined SIS and DIS regions have received varying degrees of attention from the community. While the theoretical / phenomenological study of ν-nucleon and ν-nucleus DIS scattering is advanced, such studies of a large portion of the SIS region, particularly the SIS to DIS transition region, have hardly begun. Experimentally, the SIS and the DIS regions for ν-nucleon scattering have minimal results and only in the experimental study of the ν-nucleus DIS region are there significant results for some nuclei. Since current and future neutrino oscillation experiments have contributions from both higher W SIS and DIS kinematic regions and these regions are in need of both considerable theoretical and experimental study, this review will concentrate on these SIS to DIS transition and DIS kinematic regions surveying our knowledge and the current challenges.

show abstract

“…In the case of high energy γ * γ * collisions, one can control the produced hadron multiplicity and ridge geometry using the scattered electrons' planes or the scattered proton planes in ultra-peripheral collisions at the LHC. The resulting dynamics [37] is a natural extension of the flux-tube collision description of the ridges produced in p − p collisions [38].…”

Section: Ridge Formation From Flux-tube Collisionsmentioning

confidence: 99%

Untitled

Brodsky¹

2018

Light Cone 2016

Self Cite

View full text Add to dashboard Cite

A remarkable feature of QCD is that the mass scale κ which controls color confinement and light-quark hadron mass scales does not appear explicitly in the QCD Lagrangian. However, de Alfaro, Fubini, and Furlan have shown that a mass scale can appear in the equations of motion without affecting the conformal invariance of the action if one adds a term to the Hamiltonian proportional to the dilatation operator or the special conformal operator. If one applies the same procedure to the light-front Hamiltonian, it leads uniquely to a confinement potential κ 4 ζ 2 for mesons, where ζ 2 is the LF radial variable conjugate to the qq invariant mass. The same result, including spin terms, is obtained using light-front holography -the duality between the front form and AdS 5 , the space of isometries of the conformal group -if one modifies the action of AdS 5 by the dilaton e κ 2 z 2 in the fifth dimension z. When one generalizes this procedure using superconformal algebra, the resulting light-front eigensolutions predict a unified Regge spectroscopy of meson, baryon, and tetraquarks, including remarkable supersymmetric relations between the masses of mesons and baryons of the same parity. One also predicts observables such as hadron structure functions, transverse momentum distributions, and the distribution amplitudes defined from the hadronic light-front wavefunctions. The mass scale κ underlying confinement and hadron masses can be connected to the parameter Λ M S in the QCD running coupling by matching the nonperturbative dynamics to the perturbative QCD regime. The result is an effective coupling α s (Q 2 ) defined at all momenta. The matching of the high and low momentum transfer regimes determines a scale Q 0 which sets the interface between perturbative and nonperturbative hadron dynamics. The use of Q 0 to resolve the factorization scale uncertainty for structure functions and distribution amplitudes, in combination with the principle of maximal conformality (PMC) for setting the 1 Invited talk presented at Light Cone renormalization scales, can greatly improve the precision of perturbative QCD predictions for collider phenomenology. The absence of vacuum excitations of the causal, frame-independent front-form vacuum has important consequences for the cosmological constant. I also discuss evidence that the antishadowing of nuclear structure functions is non-universal; i.e., flavor dependent, and why shadowing and antishadowing phenomena may be incompatible with sum rules for nuclear parton distribution functions.

show abstract

Novel QCD Phenomena at the LHC: The Ridge, Digluon-Initiated Subprocesses, Direct Reactions, Non-Universal Antishadowing, and Forward Higgs Production

Cited by 9 publications

References 101 publications

The physics of heavy quark distributions in hadrons: Collider tests

The physics of heavy quark distributions in hadrons: Collider tests

Neutrino(antineutrino)–nucleus interactions in the shallow- and deep-inelastic scattering regions

Untitled

Contact Info

Product

Resources

About