Fragmentation of a jet with small radius

Dai, L.; Kim, Chul; Leibovich, Adam K.

doi:10.1103/physrevd.94.114023

Cited by 95 publications

(124 citation statements)

References 49 publications

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“…Since these logarithms are integrated over the specified parton kinematics together with the steeply falling parton luminosity, threshold logarithms can dominate the entire cross section in a wide kinematic range. Instead, the jet radius R is an external quantity and the dependence of the cross section is singlelogarithmic α n s ln k ðRÞ with k ≤ n instead of double-logarithmic [29][30][31]. The framework developed in [27] addresses both these logarithmic corrections on the same footing, and it was shown that numerically the threshold and the jet radius logarithmic terms do account for the dominant bulk of the NLO corrections.…”

Section: Introductionmentioning

confidence: 99%

Phenomenology of single-inclusive jet production with jet radius and threshold resummation

2018

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We perform a detailed study of inclusive jet production cross sections at the LHC and compare the QCD theory predictions based on the recently developed formalism for threshold and jet radius joint resummation at next-to-leading logarithmic accuracy to inclusive jet data collected by the CMS Collaboration at ffiffiffi S p ¼ 7 and 13 TeV. We compute the cross sections at next-to-leading order in QCD with and without the joint resummation for different choices of jet radii R and observe that the joint resummation leads to crucial improvements in the description of the data. Comprehensive studies with different parton distribution functions demonstrate the necessity of considering the joint resummation in fits of those functions based on the LHC jet data.

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Section: Introductionmentioning

confidence: 99%

Phenomenology of single-inclusive jet production with jet radius and threshold resummation

2018

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“…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]. This type of (semi-) inclusive observables are easily accessible by the experiments and a direct comparison between theory and data is possible.…”

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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“…[10][11][12][13]. The so-called threshold logarithms arise near the exclusive phase space boundary, where the production of the signal jet just becomes possible.…”

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confidence: 99%

Threshold and Jet Radius Joint Resummation for Single-Inclusive Jet Production

2017

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We present the first threshold and jet radius jointly resummed cross section for single-inclusive hadronic jet production. We work at next-to-leading logarithmic accuracy and our framework allows for a systematic extension beyond the currently achieved precision. Long-standing numerical issues are overcome by performing the resummation directly in momentum space within soft collinear effective theory. We present the first numerical results for the LHC and observe an improved description of the available data. Our results are of immediate relevance for LHC precision phenomenology including the extraction of parton distribution functions and the QCD strong coupling constant.

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Fragmentation of a jet with small radius

Cited by 95 publications

References 49 publications

Phenomenology of single-inclusive jet production with jet radius and threshold resummation

Phenomenology of single-inclusive jet production with jet radius and threshold resummation

J/ψ Production and Polarization within a Jet

Threshold and Jet Radius Joint Resummation for Single-Inclusive Jet Production

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