The STAR collaboration presents jet substructure measurements related to both the momentum fraction and the opening angle within jets in p+p and Au+Au collisions at √sNN =200GeV. The substructure observables include SoftDrop groomed momentum fraction (zg), groomed jet radius (Rg), and subjet momentum fraction (zSJ) and opening angle (θSJ). The latter observable is introduced for the first time. Fully corrected subjet measurements are presented for p+p collisions and are compared to leading-order Monte Carlo models. The subjet θSJ distributions reflect the jets leading opening angle and are utilized as a proxy for the resolution scale of the medium in Au+Au collisions. We compare data from Au+Au collisions to those from p+p which are embedded in minimum-bias Au+Au events in order to include the effects of detector smearing and the heavy-ion collision underlying event. The subjet observables are shown to be more robust to the background than zg and Rg. We observe no significant modifications of the subjet observables within the two highest-energy, back-to-back jets, resulting in a distribution of opening angles and the splittings that are vacuumlike. We also report measurements of the differential dijet momentum imbalance (AJ) for jets of varying θSJ. We find no qualitative differences in energy loss signatures for varying angular scales in the range 0.1< θSJ<0.3, leading to the possible interpretation that energy loss in this population of high-momentum dijet pairs, is due to soft medium-induced gluon radiation from a single color charge as it traverses the medium.
Abdallah, M. S., et al. "Differential Measurements of Jet Substructure and Partonic Energy Loss in Au+Au Collisions at √ sNN = 200 GeV." Physical Review. C. Nuclear Physics, vol. 105, no. 4, Apr. 2022. https://doi.org/10.1103/PhysRevC.105.044906
Abdallah, M. S., Aboona, B. E., Adam, J., Adamczyk, L., Adams, J. R., Adkins, J. K., Agakishiev, G., Aggarwal, I., Aggarwal, M. M., Ahammed, Z, Spinka, H. M., Underwood, D. G., & Zurek, M. (2022). Differential Measurements of Jet Substructure and Partonic Energy Loss in Au+Au Collisions at √ sNN = 200 GeV. Physical Review. C. Nuclear Physics, 105(4). https://doi.org/10.1103/PhysRevC.105.044906
Abdallah, M. S., Aboona, B. E., Adam, J., et al., "Differential Measurements of Jet Substructure and Partonic Energy Loss in Au+Au Collisions at √ sNN = 200 GeV," Physical Review. C. Nuclear Physics 105, no. 4 (2022), https://doi.org/10.1103/PhysRevC.105.044906
@article{osti_1868875,
author = {Abdallah, M. S. and Aboona, B. E. and Adam, J. and Adamczyk, L. and Adams, J. R. and Adkins, J. K. and Agakishiev, G. and Aggarwal, I. and Aggarwal, M. M. and Ahammed, Z and others},
title = {Differential Measurements of Jet Substructure and Partonic Energy Loss in Au+Au Collisions at √ sNN = 200 GeV},
annote = {The STAR collaboration presents jet substructure measurements related to both the momentum fraction and the opening angle within jets in p+p and Au+Au collisions at √sNN =200GeV. The substructure observables include SoftDrop groomed momentum fraction (zg), groomed jet radius (Rg), and subjet momentum fraction (zSJ) and opening angle (θSJ). The latter observable is introduced for the first time. Fully corrected subjet measurements are presented for p+p collisions and are compared to leading-order Monte Carlo models. The subjet θSJ distributions reflect the jets leading opening angle and are utilized as a proxy for the resolution scale of the medium in Au+Au collisions. We compare data from Au+Au collisions to those from p+p which are embedded in minimum-bias Au+Au events in order to include the effects of detector smearing and the heavy-ion collision underlying event. The subjet observables are shown to be more robust to the background than zg and Rg. We observe no significant modifications of the subjet observables within the two highest-energy, back-to-back jets, resulting in a distribution of opening angles and the splittings that are vacuumlike. We also report measurements of the differential dijet momentum imbalance (AJ) for jets of varying θSJ. We find no qualitative differences in energy loss signatures for varying angular scales in the range 0.1< θSJ<0.3, leading to the possible interpretation that energy loss in this population of high-momentum dijet pairs, is due to soft medium-induced gluon radiation from a single color charge as it traverses the medium.},
doi = {10.1103/PhysRevC.105.044906},
url = {https://www.osti.gov/biblio/1868875},
journal = {Physical Review. C. Nuclear Physics},
issn = {ISSN 0556-2813},
number = {4},
volume = {105},
place = {United States},
year = {2022},
month = {04}}
National Science Foundation (NSF); Ministry of Science and Higher Education of the Russian Federation; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences (CAS); Ministry of Education of the People's Republic of China; National Research Foundation (NRF) of Korea; Czech Science Foundation (GA CR); Croatian Ministry of Science, Education and Sports; Government of India - Department of Atomic Energy; Government of India - Department of Science and Technology; National Science Centre (Poland) (NSC); Rosatom State Atomic Energy Corporation; Bundesministerium für Bildung und Forschung (BMBF); Helmholtz Association of German Research Centres; Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan; Japan Society for the Promotion of Science (JSPS); USDOE Office of Science - Office of Nuclear Physics
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1868875
Journal Information:
Physical Review. C. Nuclear Physics, Journal Name: Physical Review. C. Nuclear Physics Journal Issue: 4 Vol. 105; ISSN 0556-2813
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