Associated production of heavy quarkonia and electroweak bosons at present and future colliders

Kniehl, Bernd A.; Palisoc, Caesar P.; Zwirner, Lennart

doi:10.1103/physrevd.66.114002

Cited by 44 publications

(65 citation statements)

References 59 publications

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“…Assuming design luminosity, L ¼ 10 34 cm À2 s À1 , a cross section of 1 pb corresponds to 10 5 events per year and experiment at the LHC (see Table I of Ref. [45]). …”

Section: Discussionmentioning

confidence: 99%

Associated production ofZand neutral Higgs bosons at the CERN Large Hadron Collider

Kniehl

Palisoc

2012

Phys. Rev. D

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We study the hadroproduction of a CP-even or CP-odd neutral Higgs boson in association with a Z boson in the minimal supersymmetric extension of the standard model. We include the contributions from quark-antiquark annihilation at the tree level and those from gluon-gluon fusion, which proceeds via quark and squark loops, and list compact analytic results. We quantitatively analyze the hadronic cross sections at the CERN Large Hadron Collider assuming a favorable supergravity-inspired scenario of the minimal supersymmetric extension of the standard model.

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“…Assuming design luminosity, L ¼ 10 34 cm À2 s À1 , a cross section of 1 pb corresponds to 10 5 events per year and experiment at the LHC (see Table I of Ref. [45]). …”

Section: Discussionmentioning

confidence: 99%

Associated production ofZand neutral Higgs bosons at the CERN Large Hadron Collider

Kniehl

Palisoc

2012

Phys. Rev. D

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“…In the case of prompt J/ψ production in association with a W ± boson, the relative contributions of CS and CO processes differ from the inclusive process. Some theoretical studies [8,9] suggest W ± + prompt J/ψ production should be dominated by colour-octet processes, and thus be a distinctive test of the non-relativistic QCD (NRQCD) framework [10,11]. In contrast, recent work [12] suggests that in 7 TeV pp collisions, CO and CS (in particular, electromagnetic W ± γ * →W ± J/ψ) contributions to the W ± + prompt J/ψ cross section are comparable.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the production cross section of prompt J/ψ mesons in association with a W ± boson in pp collisions at $ \sqrt{s} $ = 7 TeV with the ATLAS detector

Aad¹,

Abajyan²,

Abbott³

et al. 2014

J. High Energ. Phys.

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Measurement of the production cross section of prompt J/ψ mesons in association with a W ± boson in pp collisions at √ s = 7 TeV with the ATLAS detectorThe ATLAS collaboration E-mail: atlas.publications@cern.ch Abstract: The process pp → W ± J/ψ provides a powerful probe of the production mechanism of charmonium in hadronic collisions, and is also sensitive to multiple parton interactions in the colliding protons. Using the 2011 ATLAS dataset of 4.5 fb −1 of √ s = 7 TeV pp collisions at the LHC, the first observation is made of the production of W ± + prompt J/ψ events in hadronic collisions, using W ± → µν µ and J/ψ → µ + µ − . A yield of 27.4 +7.5 −6.5 W ± + prompt J/ψ events is observed, with a statistical significance of 5.1σ. The production rate as a ratio to the inclusive W ± boson production rate is measured, and the double parton scattering contribution to the cross section is estimated. The ATLAS collaboration 20 IntroductionStudy of the production of a W boson in association with a prompt J/ψ meson offers new tests of Quantum Chromodynamics (QCD) at the perturbative/non-perturbative boundary as well as developing the framework for future probes of the Higgs sector and beyond-thestandard-model searches in such final states. Perturbative calculations of heavy quarkonium production in hadronic collisions distinguish between terms that produce a heavy quark system (QQ) in a colour-singlet (CS) or a colour-octet (CO) state. The relative importance of these terms for inclusive J/ψ production is a subject of debate [1][2][3][4][5][6][7]. In the case of prompt J/ψ production in association with a W ± boson, the relative contributions of CS and CO processes differ from the inclusive process. Some theoretical studies [8,9] suggest W ± + prompt J/ψ production should be dominated by colour-octet processes, and thus be a distinctive test of the non-relativistic QCD (NRQCD) framework [10,11]. In contrast, recent work [12] suggests that in 7 TeV pp collisions, CO and CS (in particular, electromagnetic W ± γ * →W ± J/ψ) contributions to the W ± + prompt J/ψ cross section are comparable. Measurements of the production cross sections can help distinguish between these models. A search for the related processes W ± +Υ(1S) and Z + Υ(1S) performed by the CDF experiment saw no excess of events above the expected background and set upper limits on the production rate [13].Observation and measurement of W ± + prompt J/ψ production for the first time represents a step in our understanding toward measurements of the Higgs boson in rare quarkonia and associated vector boson decay modes, first proposed in ref. [14]. Recent -1 - JHEP04(2014)172phenomenological studies [15] have emphasised the value of these rare decay modes to provide a unique probe of the Higgs boson charm couplings. Such final states can also be sensitive probes of beyond-the-standard-model (BSM) frameworks. The presence of an anomalous rate of W ± /Z + prompt J/ψ/Υ associated production over standard model predictions can, for example, be an indication of a sig...

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“…from the colour-singlet transitions. In the previous analyses of J/ψ+W [18,19,20], these have been disregarded since formally appearing at higher orders in α or α S . In fact, they are not negligible at 1 The CSM is nonetheless known to be plagued by infrared divergences in the case of P-wave decay at NLO, earlier regulated by an ad-hoc binding energy [16], which can however be rigorously cured [17] in the more general framework of NRQCD.…”

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confidence: 99%

Reassessing the importance of the colour-singlet contributions to direct J/ψ+W production at the LHC and the Tevatron

Lansberg

Lorcé

2013

Physics Letters B

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We show that the colour-singlet contributions to the hadroproduction of J/ψ in association with a W boson are sizable, if not dominant over the colour-octet contributions. They are of two kinds, sg → J/ψ + c + W at α 3 S α and qq → γ /Z W → J/ψW at order α 3 . These have not been considered in the literature until now. Our conclusion is that the hadroproduction of a J/ψ in association with a W boson cannot be claimed as a clean probe of the colour-octet mechanism. The rate are small even at the LHC and it will be very delicate to disentangle the colour-octet contributions from the sizable colour-singlet ones and from the possibly large double-parton-scattering contributions. During this analysis, we have also noted that, for reactions such as the production of a J/ψ by light quark-antiquark fusion, the colour-singlet contribution via an off-shell photon is of the order of the expectation from the colour-octet contribution via an off-shell gluon. This is relevant for inclusive production at low energies close to the threshold. Such an observation also likely extends to other processes naturally involving light-quark annihilation.

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Associated production of heavy quarkonia and electroweak bosons at present and future colliders

Cited by 44 publications

References 59 publications

Associated production ofZand neutral Higgs bosons at the CERN Large Hadron Collider

Associated production ofZand neutral Higgs bosons at the CERN Large Hadron Collider

Measurement of the production cross section of prompt J/ψ mesons in association with a W ± boson in pp collisions at $ \sqrt{s} $ = 7 TeV with the ATLAS detector

Reassessing the importance of the colour-singlet contributions to direct J/ψ+W production at the LHC and the Tevatron

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