Comparison of fragmentation functions for light-quark- and gluon-dominated jets from pp and Pb+Pb collisions in ATLAS Aaboud, M. Aguilar Saavedra, Juan Antonio Atlas Collaboration Charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in 25 pb−1 of pp and 0.49 nb−1 of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The measurements are compared to predictions of Monte Carlo generators and to measurements of inclusively selected jets. In pp collisions, a different jet fragmentation function in photon-tagged events from that in inclusive jet events arises from the difference in fragmentation between light quarks and gluons. The ratios of the fragmentation functions in Pb+Pb events to that in pp events are used to explore the parton color-charge dependence of jet quenching in the hot medium. In relatively peripheral collisions, fragmentation functions exhibit a similar modification pattern for photon-tagged and inclusive jets. However, photon-tagged jets are observed to have larger modifications than inclusive jets in central Pb+Pb events. 2020-03-10T09:55:44Z 2020-03-10T09:55:44Z 2019-07-22 info:eu-repo/semantics/article Collaboration, A. T. L. A. S., Barton, A. E., Bertram, I. A., Bouhova-Thacker, E. V., Fox, H., Henderson, R. C. W., ... & Muenstermann, D. (2019). Comparison of Fragmentation Functions for Jets Dominated by Light Quarks and Gluons from $ pp $ and $\mathrm {Pb}+\mathrm {Pb} $ Collisions in ATLAS. Physical review letters, 123(4). http://hdl.handle.net/10481/60173 10.1103/PhysRevLett.123.042001 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España American Physical Society