Associated Production of Heavy Flavoured States in Hadron Interactions-Some QCD Estimates

Combridge, B.L.

doi:10.1088/0031-8949/20/1/001

Cited by 11 publications

(10 citation statements)

References 24 publications

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“…Non-prompt production The nPDF effects on non-prompt (coming from B decays) has been investigated by Ferreiro et al in [ 368 ]. Contrary to the more complex case of bottomonium production, it is sufficient to rely on LO calculations [ 369 ] to deal with open-beauty production data integrated in as those of LHCb [ 330 ]. Indeed such computations are sufficient to describe the low- cross section up to (1–2) , where the bulk of the yield lies.…”

Section: Cold Nuclear Matter Effects On Heavy Flavour and Quarkonium mentioning

confidence: 99%

“…For the collisional energy loss, the elements of the transition matrix are calculated from the pQCD Born approximation [ 369 , 531 ], supplemented by a running coupling constant evaluated according to 1-loop renormalisation for and chosen to saturate at small in order to satisfy the universality relation [ 532 , 533 ]: with and with and . The t channel requires infra-red regularisation which describes the physics of the screening at long distances [ 534 ].…”

Section: Open Heavy Flavour In Nucleus–nucleus Collisionsmentioning

confidence: 99%

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Heavy-flavour and quarkonium production in the LHC era: from proton–proton to heavy-ion collisions

et al. 2016

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This report reviews the study of open heavy-flavour and quarkonium production in high-energy hadronic collisions, as tools to investigate fundamental aspects of Quantum Chromodynamics, from the proton and nucleus structure at high energy to deconfinement and the properties of the Quark–Gluon Plasma. Emphasis is given to the lessons learnt from LHC Run 1 results, which are reviewed in a global picture with the results from SPS and RHIC at lower energies, as well as to the questions to be addressed in the future. The report covers heavy flavour and quarkonium production in proton–proton, proton–nucleus and nucleus–nucleus collisions. This includes discussion of the effects of hot and cold strongly interacting matter, quarkonium photoproduction in nucleus–nucleus collisions and perspectives on the study of heavy flavour and quarkonium with upgrades of existing experiments and new experiments. The report results from the activity of the SaporeGravis network of the I3 Hadron Physics programme of the European Union 7 Framework Programme.

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Section: Cold Nuclear Matter Effects On Heavy Flavour and Quarkonium mentioning

confidence: 99%

Section: Open Heavy Flavour In Nucleus–nucleus Collisionsmentioning

confidence: 99%

Heavy-flavour and quarkonium production in the LHC era: from proton–proton to heavy-ion collisions

et al. 2016

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“…The various components, in terms of the velocity of the final top quark at the partonic levelβ t = 1 − 4m 2 t /ŝ read [16][17][18][19][20][21][22][23][24][25][26][81][82][83][84][85][86] …”

Section: Jhep07(2016)105mentioning

confidence: 99%

Interference effects in the decays of spin-zero resonances into γγ and t t ¯ $$ t\overline{t} $$

Djouadi

Ellis

Quevillon

2016

J. High Energ. Phys.

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We consider interference effects in the production via gluon fusion in LHC collisions at 13 TeV and decays into γγ and tt final states of one or two putative new resonant states Φ, assumed here to be scalar and/or pseudoscalar particles. Although our approach is general, we use for our numerical analysis the example of the putative 750 GeV state for which a slight excess was observed in the initial LHC 13 TeV data. We revisit previous calculations of the interferences between the heavy-fermion loop-induced gg → Φ → γγ signal and the continuum gg → γγ QCD background, which can alter the production rate as well as modify the line-shape and apparent mass. We find a modest enhancement by ∼ 20% under favorable circumstances, for a large Φ width. The effect of interference on the apparent scalar-pseudoscalar mass difference in a two-Higgs-doublet model is found to be also modest. An exploratory study indicates that similar effects are to be expected in the gg → Φ → Zγ channel. In this and other models with a large Φ total width, the dominant Φ decays are expected to be into tt final states. We therefore also study the effects of interference of the gg → Φ → tt signal with the gg → tt continuum QCD background and show that in the presence of standard fermions only in the gg → Φ loops, it is destructive causing a dip in the tt mass distribution. Including additional vector-like quarks leads to a different picture as peaks followed by dips can then occur. We use the absence of such effects in ATLAS and CMS data to constrain models of the production and decays of the Φ state(s).

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“…Not to go beyond the scope of the general pattern of [1], we assume in the present work that the dominating mechanism in the process of J/ψ production in the proton-nucleon collision is the fusion of two gluons [10]. Under this assumption, in the kinematical range 0.3 F x ≥ considered in [7], prior to the production act pN J X → ψ , the proton p must have in its composition a hard gluon h g , at which falls an essential part of the momentum of the whole state.…”

Section: Introductionmentioning

confidence: 99%

Account of energy losses of hard gluons in processes of J/ψ-meson production in proton–nucleus collisions

Zhamkochyan

2017

J. Contemp. Phys.

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Abstract⎯Processes of production of ⎯ cc-states in proton-nucleus collisions are considered. The model is proposed taking into account energy losses of hard gluons in inelastic interactions of hadron states with nucleus nucleons. Results of performed calculations on the A-dependence of inclusive spectra of pA → J/ψX processes are presented together with FNAL E866 experimental data.case the general picture of pA J X → ψ process would correspond to assumptions of model [1], and the

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Associated Production of Heavy Flavoured States in Hadron Interactions-Some QCD Estimates

Abstract: Associated production of heavy flavoured states in hadron interactionssome QCD estimates. B. L. Combridge (CERN, Geneva, Switzerland).

Cited by 11 publications

References 24 publications

Heavy-flavour and quarkonium production in the LHC era: from proton–proton to heavy-ion collisions

Heavy-flavour and quarkonium production in the LHC era: from proton–proton to heavy-ion collisions

Interference effects in the decays of spin-zero resonances into γγ and t t ¯ $$ t\overline{t} $$

Account of energy losses of hard gluons in processes of J/ψ-meson production in proton–nucleus collisions

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