Event-shape and multiplicity dependence of freeze-out radii in pp collisions at root s=7 TeV
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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 proportional
to 1/R. It was previously observed that in pp collisions at root s = 7
TeV the average pair transverse momentum k(T) 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 analyysis of Bose-Einstein correlations for pion pairs is
performed in this work. By categorizing the events by their transverse
sphericity S-T into spherical (S-T > 0.7) and jet-like (S-T < 0.3)
events a method was developed that allows for the determination of
source radii for much larger values of k(T) 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 k(T) dependence of the radii. The emission source size in spherical
events shows a substantially diminished k(T) dependence, while jet-like
events show indications of a negative trend with respect to k(T) 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.... Show more Show less