Effective Field Theory approach to heavy quark fragmentation

Fickinger, Michael; Fleming, Sean; Kim, Chul; Mereghetti, Emanuele

doi:10.1007/jhep11(2016)095

Cited by 40 publications

(53 citation statements)

References 128 publications

(293 reference statements)

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“…Note that the parameter Λ found here is smaller than the corresponding λ found in Ref. [102]. This is due to the fact that, in our analysis Λ depends on soft-drop which suppresses contribution from the wide angle radiation.…”

Section: Non-perturbative Correctionscontrasting

confidence: 66%

“…which implements a simple shift in z, so that the hadronized spectrum is same as the partonic one at a lower value of z. More sophisticated models exist in literature [102,103] which smoothen out the delta function about its central value of y = Λ/m, but have essentially have the same effect. Figure 6 shows the comparison of hadronized Pythia with this simple shift model.…”

Section: Non-perturbative Correctionsmentioning

confidence: 99%

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Transverse momentum spectra at threshold for groomed heavy quark jets

Makris

Vaidya

2018

J. High Energ. Phys.

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We present the transverse momentum spectrum for a heavy hadron at threshold in a groomed jet initiated by a heavy quark. The cross section is doubly differential in the energy fraction of an identified heavy hadron in the jet and its transverse momentum measured with respect to the groomed (recoil free) jet axis. The grooming is implemented using a soft-drop grooming algorithm and helps us in mitigating the effects of Non-Global logarithms and pile up. For the particular case of a B meson, we identify two distinct regimes of the transverse momentum spectrum and develop an EFT within the formalisms of Soft Collinear Effective Theory (SCET) and Heavy Quark Effective Theory (HQET) for each of these regions. We show how each region can be matched smoothly into the other to provide a prediction for the perturbative transverse momentum spectrum. The EFT also predicts the scaling behavior of the leading non-perturbative power corrections and implements a simple shape function to account for hadronization. We work in the threshold region where the heavy hadron carries most of the energy of the jet since in this regime, we have a very good discriminating power between heavy quark and gluon initiated jets. We observe that the shape of the spectrum is independent of the energy of the jet over a large range of transverse momentum. We propose that this spectrum can be used as a probe of evolution for heavy quark TMD fragmentation function. At the same time, it can be treated as a jet substructure observable for probing Quark-Gluon Plasma (QGP).

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Section: Non-perturbative Correctionscontrasting

confidence: 66%

Section: Non-perturbative Correctionsmentioning

confidence: 99%

Transverse momentum spectra at threshold for groomed heavy quark jets

Makris

Vaidya

2018

J. High Energ. Phys.

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“…As it turns out, the description of the underlying proton-proton baseline plays an important role. Several different approaches are available in the literature to deal with heavy quark masses in the fragmentation process [49][50][51][52][53][54][55][56]. The suppression rates in heavy-ion collisions crucially depend on whether the heavy meson is produced by a fragmenting heavy quark or a gluon.…”

Section: Contentsmentioning

confidence: 99%

Effective field theory approach to open heavy flavor production in heavy-ion collisions

Kang

Ringer

Vitev

2017

J. High Energ. Phys.

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Abstract:We develop a version of Soft Collinear Effective Theory (SCET) which includes finite quark masses, as well as Glauber gluons that describe the interaction of collinear partons with QCD matter. In the framework of this new effective field theory, labeled SCET M,G , we derive the massive splitting functions in the vacuum and the QCD medium for the processes Q → Qg, Q → gQ and g → QQ. The numerical effects due to finite quark masses are sizable and our results are consistent with the traditional approach to parton energy loss in the soft gluon emission limit. In addition, we present a new framework for including the medium-induced full splitting functions consistent with next-to-leading order calculations in QCD for inclusive hadron production. Finally, we show numerical results for the suppression of D-and B-mesons in heavy ion collisions at √ s NN = 5.02 TeV and 2.76 TeV and compare to available data from the LHC.

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“…More recently, the approach based on Soft Collinear Effective Theory (SCET) and Heavy Quark Effective Theory (HQET) was used in the NNLO+NNNLL approximation in order to determine the b-quark fragmentation function from e + e − annihilation at the Z pole [37]. The authors found a general good agreement with the data, although some discrepancy is still present for large values of the energy fraction, where one is mostly sensitive to non-perturbative effects.…”

Section: Introductionmentioning

confidence: 99%

Fragmentation uncertainties in hadronic observables for top-quark mass measurements

2018

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A Determination of the sensitivity matrix 31 B Sensitivities and special features of m T 2 32 Abstract We study the Monte Carlo uncertainties due to modeling of hadronization and showering in the extraction of the top-quark mass from observables that use exclusive hadronic final states in top decays, such as t → anything+J/ψ or t → anything + (B → charged tracks), where B is a B-hadron. To this end, we investigate the sensitivity of the top-quark mass, determined by means of a few observables already proposed in the literature as well as some new proposals,to the relevant parameters of event generators, such as HERWIG 6 and PYTHIA 8. We find that constraining those parameters at O(1% − 10%) is required to avoid a Monte Carlo uncertainty on mt greater than 500 MeV. For the sake of achieving the needed accuracy on such parameters, we examine the sensitivity of the top-quark mass measured from spectral features, such as peaks, endpoints and distributions of E B , m B , and some m T 2 -like variables. We find that restricting oneself to regions sufficiently close to the endpoints enables one to substantially decrease the dependence on the Monte Carlo parameters, but at the price of inflating significantly the statistical uncertainties. To ameliorate this situation we study how well the data on top-quark production and decay at the LHC can be utilized to constrain the showering and hadronization variables. We find that a global exploration of several calibration observables, sensitive to the Monte Carlo parameters but very mildly to mt, can offer useful constraints on the parameters, as long as such quantities are measured with a 1% precision.

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Effective Field Theory approach to heavy quark fragmentation

Cited by 40 publications

References 128 publications

Transverse momentum spectra at threshold for groomed heavy quark jets

Transverse momentum spectra at threshold for groomed heavy quark jets

Effective field theory approach to open heavy flavor production in heavy-ion collisions

Fragmentation uncertainties in hadronic observables for top-quark mass measurements

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