How many interactions does it take to modify a jet?
(2025) In European Physical Journal C 85(9).- Abstract
It is a continued open question how there can be an azimuthal anisotropy of high p⊥ particles quantified by a sizable v2 in p+Pb collisions when, at the same time, the nuclear modification factor RAA is consistent with unity. We address this puzzle within the framework of the jet quenching model Jewel. In the absence of reliable medium models for small collision systems we use the number of scatterings per parton times the squared Debye mass to characterise the strength of medium modifications. Working with a simple brick medium model we show that, for small systems and not too strong modifications, RAA and v2 approximately scale with this quantity. We find that a comparatively large number of scatterings is needed to generate... (More)
It is a continued open question how there can be an azimuthal anisotropy of high p⊥ particles quantified by a sizable v2 in p+Pb collisions when, at the same time, the nuclear modification factor RAA is consistent with unity. We address this puzzle within the framework of the jet quenching model Jewel. In the absence of reliable medium models for small collision systems we use the number of scatterings per parton times the squared Debye mass to characterise the strength of medium modifications. Working with a simple brick medium model we show that, for small systems and not too strong modifications, RAA and v2 approximately scale with this quantity. We find that a comparatively large number of scatterings is needed to generate measurable jet quenching. Our results indicate that the RAA corresponding to the observed v2 could fall within the experimental uncertainty. Thus, while there is currently no contradiction with the measurements, our results indicate that v2 and RAA go hand-in-hand. We also discuss departures from scaling, in particular, due to sizable inelastic energy loss.
(Less)
- author
- Le Roux, Chiara LU ; Milhano, José Guilherme and Zapp, Korinna LU
- organization
- publishing date
- 2025-09
- type
- Contribution to journal
- publication status
- published
- subject
- in
- European Physical Journal C
- volume
- 85
- issue
- 9
- article number
- 1065
- publisher
- Springer Nature
- external identifiers
-
- pmid:41019701
- scopus:105017757764
- ISSN
- 1434-6044
- DOI
- 10.1140/epjc/s10052-025-14799-2
- language
- English
- LU publication?
- yes
- id
- bd35e6e2-390a-4381-8bb5-3982480816a5
- date added to LUP
- 2025-11-27 11:43:15
- date last changed
- 2025-12-11 13:11:04
@article{bd35e6e2-390a-4381-8bb5-3982480816a5,
abstract = {{<p>It is a continued open question how there can be an azimuthal anisotropy of high p⊥ particles quantified by a sizable v2 in p+Pb collisions when, at the same time, the nuclear modification factor RAA is consistent with unity. We address this puzzle within the framework of the jet quenching model Jewel. In the absence of reliable medium models for small collision systems we use the number of scatterings per parton times the squared Debye mass to characterise the strength of medium modifications. Working with a simple brick medium model we show that, for small systems and not too strong modifications, RAA and v2 approximately scale with this quantity. We find that a comparatively large number of scatterings is needed to generate measurable jet quenching. Our results indicate that the RAA corresponding to the observed v2 could fall within the experimental uncertainty. Thus, while there is currently no contradiction with the measurements, our results indicate that v2 and RAA go hand-in-hand. We also discuss departures from scaling, in particular, due to sizable inelastic energy loss.</p>}},
author = {{Le Roux, Chiara and Milhano, José Guilherme and Zapp, Korinna}},
issn = {{1434-6044}},
language = {{eng}},
number = {{9}},
publisher = {{Springer Nature}},
series = {{European Physical Journal C}},
title = {{How many interactions does it take to modify a jet?}},
url = {{http://dx.doi.org/10.1140/epjc/s10052-025-14799-2}},
doi = {{10.1140/epjc/s10052-025-14799-2}},
volume = {{85}},
year = {{2025}},
}