Revisiting transverse momentum broadening in dense QCD media

Barata, João; Mehtar-Tani, Yacine; Soto-Ontoso, Alba; Tywoniuk, Konrad

doi:10.1103/physrevd.104.054047

Cited by 36 publications

(27 citation statements)

References 49 publications

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“…Another kinematic regime commonly considered in the literature [47,63] corresponds to the intermediate momentum region µ 2 p 2 ⊥ ≤ χ µ 2 . In this case, the exponential of the dipole potential cannot be expanded, while the approximation (55) can still be utilized.…”

Section: The Final State Distribution and Its Propertiesmentioning

confidence: 99%

Jet broadening in dense inhomogeneous matter

Barata,

Sadofyev,

Salgado

2022

Preprint

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In this work, we study the jet momentum broadening in an inhomogeneous dense QCD medium.The transverse profile of this nuclear matter is described within a gradient expansion, and we focus on the leading gradient contributions. The leading parton is allowed to interact multiple times with the background through the soft gluon exchanges. We derive the associated final particle distribution using both the GLV opacity series and the BDMPS-Z formalism. We further discuss the modified factorization of the initial and final state effects and its consequences for phenomenological applications in the context of heavy-ion collisions and deep inelastic scattering. Finally, we present the broadening probability (describing the final state effects) in several limiting regimes, and give its numerical estimates for phenomenologically motivated sets of parameters.

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Section: The Final State Distribution and Its Propertiesmentioning

confidence: 99%

Jet broadening in dense inhomogeneous matter

Barata,

Sadofyev,

Salgado

2022

Preprint

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“…To introduce the IOE formalism [1][2][3][4][5] we consider first the simplest possible observable: single particle momentum broadening. At eikonal accuracy, momentum broadening can be fully characterized by an associated broadening distribution P ( 𝒌, 𝑡) which gives the probability for a parton to acquire transverse momentum 𝒌 in the medium as a result of its propagation for a time 𝑡.…”

Section: A Working Example: Momentum Broadening In the Ioe Approachmentioning

confidence: 99%

“…Requiring that 𝑄 2 𝑏 𝜇 2 * , the second term only becomes dominant at small 𝒙 (large 𝒌), and thus it can be treated perturbatively. As a result the broadening distribution can be written as [1]…”

Section: Pos(panic2021)232mentioning

confidence: 99%

Medium induced gluon spectrum in the Improved Opacity Expansion

Barata

2022

Proceedings of Particles and Nuclei International Conference 2021 — PoS(PANIC2021)

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Over the last decades, analytical calculations of jet quenching observables have always needed to make a distinction between dense or dilute mediums. Although there are different theoretical formalisms suited for each one of these scenarios, taking into account multiple soft and single hard interactions between the probe and the background under a single approach has proven to be a difficult task. In this talk, we will introduce the Improved Opacity Expansion (IOE), which extends the well established Opacity Expansion framework beyond the hard momentum transfer tail, including the regime captured by the BDMPS-Z/ASW approximation. We will focus on the application of the IOE to the computation of the single gluon medium induced spectrum from a hard parton, which constitutes one of the most important theoretical results in jet quenching theory.

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“…The IOE has so far only been developed for the spectrum integrated over transverse momenta, i.e. dI/dω, and for the momentum broadening of a single particle in the medium [43]. Since the contributions to jet energy loss rely on out-of-cone emissions, cf.…”

Section: Jhep10(2021)038mentioning

confidence: 99%

Quenching effects in the cumulative jet spectrum

Takács

Tywoniuk

2021

J. High Energ. Phys.

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The steeply falling jet spectrum induces a bias on the medium modifications of jet observables in heavy-ion collisions. To explore this effect, we develop a novel analytic framework to study the quenched jet spectrum and its cumulative. We include many energy-loss-related effects, such as soft and hard medium induced emissions, broadening, elastic scattering, jet fragmentation, cone size dependence, and coherence effects. We show that different observables, based on the jet spectrum, are connected, e.g., the nuclear modification, spectrum shift, and the quantile procedure. We present the first predictions for the nuclear modification factor and the quantile procedure with cone size dependence. As a concrete example, we compare dijet and boson+jet events to unfold the spectrum bias effects, and improve quark-, and gluon-jet classification using arguments based on the cumulative. Besides pointing out its flexibility, finally, we apply our framework to other energy loss models such as the hybrid weak/strong-coupling approach.

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Revisiting transverse momentum broadening in dense QCD media

Cited by 36 publications

References 49 publications

Jet broadening in dense inhomogeneous matter

Jet broadening in dense inhomogeneous matter

Medium induced gluon spectrum in the Improved Opacity Expansion

Quenching effects in the cumulative jet spectrum

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