Transverse momentum dependent fragmenting jet functions with applications to quarkonium production

Bain, Reggie; Makris, Yiannis; Mehen, Thomas

doi:10.1007/jhep11(2016)144

Cited by 52 publications

(48 citation statements)

References 49 publications

(95 reference statements)

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“…A number of other jet observables that account for transverse momentum dependence have recently been considered. The main focus has been on the transverse momentum of hadrons fragmenting in jets, in both inclusive [4] and semi-inclusive [5,6] processes. In the same context, refs.…”

Section: Contentsmentioning

confidence: 99%

Transverse momentum dependent distributions in e+e− and semi-inclusive deep-inelastic scattering using jets

Gutiérrez-Reyes

Scimemi

Waalewijn

et al. 2019

J. High Energ. Phys.

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The extraction of transverse momentum dependent distributions (TMDs) in semiinclusive deep inelastic scattering (SIDIS) is complicated by the presence of both initial-and final-state nonperturbative physics. We recently proposed measuring jets (instead of hadrons) as a solution, showing that for the Winner-Take-All jet axis the same factorization formulae valid for hadrons applied to jets of arbitrary size. This amounts to simply replacing TMD fragmentation functions by our TMD jet functions. In this paper we present the calculation of these jet functions at one loop. We obtain phenomenological results for e + e − → dijet (Belle II, LEP) and SIDIS (HERA, EIC) with a jet, building on the arTeMiDe code. Surprisingly, we find that the limit of large jet radius describes the full R results extremely well, and we extract the two-loop jet function in this limit using Event2, allowing us to achieve N 3 LL accuracy. We demonstrate the perturbative convergence of our predictions and explore the kinematic dependence of the cross section. Finally, we investigate the sensitivity to nonperturbative physics, demonstrating that jets are a promising probe of proton structure.

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Section: Contentsmentioning

confidence: 99%

Transverse momentum dependent distributions in e+e− and semi-inclusive deep-inelastic scattering using jets

Gutiérrez-Reyes

Scimemi

Waalewijn

et al. 2019

J. High Energ. Phys.

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“…The idea to measure J/ψ mesons inside jets was first proposed in [21] in the context of exclusive n-jet processes. See also [22,23]. In this work, we perform the calculation of J/ψ mesons in jets where the observable is defined to be inclusive over the entire final state except for the observed jet [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

J/ψ Production and Polarization within a Jet

et al. 2017

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We study the production and polarization of J/ψ mesons within a jet in proton-proton collisions at the LHC. We define the J/ψ-jet fragmentation function as a ratio of differential jet cross sections with and without the reconstructed J/ψ in the jet. We demonstrate that this is a very useful observable to help explore the J/ψ production mechanism, and to differentiate between different NRQCD global fits based on inclusive J/ψ cross sections. Furthermore, we propose to measure the polarization of J/ψ mesons inside the jet, which can provide even more stringent constraints for the heavy quarkonium production mechanism. Introduction.Understanding the J/ψ production mechanism is one of the most active and challenging subjects in strong interaction physics [1,2]. The most common approach to calculating the J/ψ production cross section in hadronic collisions is the non-relativistic QCD (NRQCD) factorization formalism [3]. In this approach, the heavy quark and anti-quark pair, QQ, is produced at short-distance which can be calculated perturbatively due to the large heavy quark masses. Such a QQ state will then hadronize into a physical J/ψ meson. This transition is non-perturbative, but it can be characterized through a set of universal NRQCD long-distance matrix elements (LDMEs). Global analyses of the world's data on J/ψ production with the next-to-leading order (NLO) calculations in powers of strong coupling constant α s have been performed by several groups [4][5][6][7][8]. Even though all these groups can describe the inclusive J/ψ production cross section, i.e., the p T spectrum, they have not been able to fully explain the polarization of high-p T heavy quarkonia produced at the Tevatron [9][10][11][12] and the LHC [13,14]. Despite of numerous attempts made in the past, the J/ψ polarization remains a puzzle.

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“…Figure taken from [15] in Ref. [23] necessary for this calculation. We show that, at large values of the energy ratio, such measurement can provide the desirable discriminating power between the color-octet production mechanisms.…”

Section: Review Of Fragmenting Jet Functionsmentioning

confidence: 99%

Transverse Momentum Dependent Fragmenting Jet Functions with Applications to Quarkonium Production

Makris

2018

Proceedings of QCD Evolution 2017 — PoS(QCDEV2017)

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We briefly review the framework of fragmenting jet functions (FJFs) introduced in soft collinear effective theory (SCET) to describe the fragmentation of an identified hadron within a jet. We illustrate how FJFs can be integrated with the leading power (LP) factorization in non-relativistic quantum chromodynamics (NRQCD) in studies of quarkonium production within jets. We present recent theoretical, experimental, and computational developments. We also present the framework of transverse momentum dependent (TMD) FJFs which describe the fragmentation of a hadron within a jet and the transverse momentum of the identified hadron is measured with respect to the jet axis. We show how the measurement of the transverse momentum spectrum can help discriminate between the leading production mechanisms of J/ψ.

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Transverse momentum dependent fragmenting jet functions with applications to quarkonium production

Cited by 52 publications

References 49 publications

Transverse momentum dependent distributions in e+e− and semi-inclusive deep-inelastic scattering using jets

Transverse momentum dependent distributions in e+e− and semi-inclusive deep-inelastic scattering using jets

J/ψ Production and Polarization within a Jet

Transverse Momentum Dependent Fragmenting Jet Functions with Applications to Quarkonium Production

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