Probing quarkonium production mechanisms with jet substructure

Baumgart, Matthew; Leibovich, Adam K.; Mehen, Thomas; Rothstein, Ira Z.

doi:10.1007/jhep11(2014)003

Cited by 49 publications

(73 citation statements)

References 55 publications

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“…We leave the studies of jet fragmentation function modification using the SCET formulation [120,133,134], as well as the modification of jet masses [135][136][137][138] which probes the jet formation mechanism at the soft scale, for future work.…”

Section: Jhep05(2016)023mentioning

confidence: 99%

Towards the understanding of jet shapes and cross sections in heavy ion collisions using soft-collinear effective theory

Chien

Vitev

2016

J. High Energ. Phys.

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We calculate the jet shape and the jet cross section in heavy ion collisions using soft-collinear effective theory (SCET) and its extension with Glauber gluon interactions in the medium (SCET G ). We use the previously developed framework to systematically resum the jet shape at next-to-leading logarithmic accuracy, and we consistently include the medium modification by incorporating the leading order medium-induced splitting functions. The calculation provides, for the first time, a quantitative understanding of the jet shape modification measurement in lead-lead collisions at √ s NN = 2.76 TeV at the LHC. The inclusive jet suppression is also calculated within the same framework beyond the traditional concept of parton energy loss, and the dependence on the centrality, the jet radius and the jet kinematics is examined. In the end we present predictions for the anticipated jet shape and cross section measurements in lead-lead collisions at √ s NN ≈ 5.1 TeV at the LHC.

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Section: Jhep05(2016)023mentioning

confidence: 99%

Towards the understanding of jet shapes and cross sections in heavy ion collisions using soft-collinear effective theory

Chien

Vitev

2016

J. High Energ. Phys.

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“…The different contributions to the gluon FJF as a function of E for fixed values of z are shown in Fig. 3 [28]. Note that the 1 S…”

Section: New Tests Of Nrqcd Using Jet Observablesmentioning

confidence: 93%

“…4 as a function of z for fixed values of E, and in Fig. 5 as a function of E for fixed values of z [28]. The resulting FJFs are different even taking into account uncertaintites in the matrix elements.…”

Section: E Gevmentioning

confidence: 95%

“…To calculate the FJFs G h i (E, R, z, µ) when h is a quarkonium, one simply needs to evolve the NRQCD fragmentation functions from the scale 2m Q to the scale µ J using DGLAP evolution and then perform the convolution with the matching coefficients in Eq. (2.2) [28].…”

Section: New Tests Of Nrqcd Using Jet Observablesmentioning

confidence: 99%

“…The FJF G J/ψ i (E, R, z, µ) is a function of E, R, and z, and the dependence on 1 charm quark FJF [28].…”

Section: New Tests Of Nrqcd Using Jet Observablesmentioning

confidence: 99%

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New Tests of NRQCD from Quarkonia within Jets

Mehen¹

2016

Proceedings of QCD Evolution 2015 — PoS(QCDEV2015)

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I review the current status of quarkonium production theory based on the non-relativistic QCD factorization formalism (NRQCD). While this theory describes much of the world's data on J/ψ and ϒ production, there are still outstanding problems, most notably the polarization of quarkonia at large p T in hadron colliders. In this talk we will present new tests of NRQCD involving the distribution of quarkonia within jets. The distribution of hadrons within jets is determined by nonperturbative functions called fragmenting jet functions (FJFs). FJFs are convolutions of fragmentation functions, evolved to the jet energy scale, with perturbatively calculable matching coefficients. I show how the FJFs for quarkonia can be calculated in NRQCD in terms of a few NRQCD long-distance matrix elements (LDME), so the dependence of the cross section on the energy fraction of the heavy quarkonium, z, is sensitive to the underlying production mechanism, and therefore provides a new test of NRQCD. The jet energy and z dependence of the cross section can be used to perform an independent extraction of NRQCD LDME. Finally, I describe ongoing work building on this result. This includes comparison of analytic resummed calculations with Monte Carlo simulations for two-jet events in e + e − collisions with B mesons, and three-jet events with J/ψ, as well as the definition of boost invariant jet substructure variables and calculation of a boost invariant soft function that are necessary for analytic calculations of jet cross sections at the Large Hadron Collider.

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Phenomenology with a recoil-free jet axis: TMD fragmentation and the jet shape

Neill

Papaefstathiou

Waalewijn

et al. 2019

J. High Energ. Phys.

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We study the phenomenology of recoil-free jet axes using analytic calculations and Monte Carlo simulations. Our focus is on the average energy as function of the angle with the jet axis (the jet shape), and the energy and transverse momenta of hadrons in a jet (TMD fragmentation). We find that the dependence on the angle (or transverse momentum) is governed by a power law, in contrast to the double-logarithmic dependence for the standard jet axis. The effects of the jet radius, jet algorithm, angular resolution and grooming are investigated. TMD fragmentation is important for constraining the structure of the proton through semi-inclusive deep-inelastic scattering. These observables are also of interest to the LHC, for example to constrain α s from precision jet measurements, or probe the quark-gluon plasma in heavy-ion collisions.

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Probing quarkonium production mechanisms with jet substructure

Cited by 49 publications

References 55 publications

Towards the understanding of jet shapes and cross sections in heavy ion collisions using soft-collinear effective theory

Towards the understanding of jet shapes and cross sections in heavy ion collisions using soft-collinear effective theory

New Tests of NRQCD from Quarkonia within Jets

Phenomenology with a recoil-free jet axis: TMD fragmentation and the jet shape

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