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Event-shape and multiplicity dependence of freeze-out radii in pp collisions at √s = 7 TeV

Acharya S.
•
Adamova D.
•
Adhya S. P.
altro
Zinovjev G.
2019
  • journal article

Periodico
JOURNAL OF HIGH ENERGY PHYSICS
Abstract
Two-particle correlations in high-energy collision experiments enable the extraction of particle source radii by using the Bose-Einstein enhancement of pion production at low relative momentum q ∝ 1/R. It was previously observed that in pp collisions at s = 7TeV the average pair transverse momentum kT range of such analyses is limited due to large background correlations which were attributed to mini-jet phenomena. To investigate this further, an event-shape dependent analysis of Bose-Einstein correlations for pion pairs is performed in this work. By categorizing the events by their transverse sphericity ST into spherical (ST > 0:7) and jet-like (ST < 0:3) events a method was developed that allows for the determination of source radii for much larger values of kT for the first time. Spherical events demonstrate little or no background correlations while jet-like events are dominated by them. This observation agrees with the hypothesis of a mini-jet origin of the non-femtoscopic background correlations and gives new insight into the physics interpretation of the kT dependence of the radii. The emission source size in spherical events shows a substantially diminished kT dependence, while jet-like events show indications of a negative trend with respect to kT in the highest multiplicity events. Regarding the emission source shape, the correlation functions for both event sphericity classes show good agreement with an exponential shape, rather than a Gaussian one. [Figure not available: see fulltext.].
DOI
10.1007/JHEP09(2019)108
WOS
WOS:000490861500003
Archivio
http://hdl.handle.net/11368/2966467
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85074488241
https://link.springer.com/article/10.1007/JHEP09(2019)108
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by-nc-nd/4.0/
FVG url
https://arts.units.it/bitstream/11368/2966467/1/Eventshape-and-multiplicity-dependence-of-freezeout-radii-in-pp-collisions-at-s--7-TeV2019Journal-of-High-Energy-PhysicsOpen-Access.pdf
Soggetti
  • Heavy Ion Experiment

  • Particle correlations...

Scopus© citazioni
7
Data di acquisizione
Jun 14, 2022
Vedi dettagli
Web of Science© citazioni
10
Data di acquisizione
Mar 27, 2024
Visualizzazioni
1
Data di acquisizione
Apr 19, 2024
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