Event-shape and multiplicity dependence of freeze-out radii in pp collisions at $$ \sqrt{s} $$ = 7 TeV

• Published in: The journal of high energy physics Vol. 2019; no. 9
• Main Authors: Acharya, S., Adamová, D., Adhya, S. P., Adler, A., Adolfsson, J., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, S. N., Albuquerque, D. S. D., Aleksandrov, D., Alessandro, B., Alfanda, H. M., Alfaro Molina, R., Ali, Y., Alici, A., Alkin, A., Alme, J., Alt, T., Altenkamper, L., Altsybeev, I., Anaam, M. N., Andrei, C., Andreou, D., Andrews, H. A., Andronic, A., Angeletti, M., Anguelov, V., Anson, C., Antičić, T., Antinori, F., Antonioli, P., Anwar, R., Apadula, N., Aphecetche, L., Appelshäuser, H., Arcelli, S., Arnaldi, R., Arsene, I. C., Arslandok, M., Augustinus, A., Averbeck, R., Azmi, M. D., Badalá, A., Baek, Y. W., Bagnasco, S., Bailhache, R., Bala, R., Baldisseri, A., Ball, M., Baral, R. C., Barbera, R., Barioglio, L., Barnaföldi, G. G., Barnby, L. S., Barret, V., Bartalini, P., Barth, K., Bartsch, E., Bastid, N., Basu, S., Batigne, G., Batyunya, B., Batzing, P. C., Bazo Alba, J. L., Bearden, I. G., Beck, H., Bedda, C., Behera, N. K., Belikov, I., Bellini, F., Bello Martinez, H., Bellwied, R., Beltran, L. G. E., Belyaev, V., Bencedi, G., Beole, S., Bercuci, A., Berdnikov, Y., Berenyi, D., Bertens, R. A., Berzano, D., Betev, L., Bhasin, A., Bhat, I. R., Bhatt, H., Bhattacharjee, B., Bhom, J., Bianchi, A., Bianchi, L., Bianchi, N., Bielčík, J., Bielčíková, J.
• Format: Journal Article
• Language: English
• Published: United States Springer 01.09.2019; Springer Nature
• Subjects: heavy ion experiments; High Energy Physics - Experiment; Nuclear Experiment; particle correlations and fluctuations; Physics; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; background: correlation; pi: production; sphericity; transverse momentum; experimental results; event shape analysis; freeze-out; correlation: two-particle; Heavy Ion Experiments; Particle correlations and fluctuations; pi: enhancement; particle source; multiplicity: dependence; 7000 GeV-cms/nucleon; p p: scattering; correlation: Bose-Einstein; fluctuation; correlation function
• ISSN: 1029-8479; 1126-6708; 1029-8479
• DOI: 10.1007/JHEP09(2019)108

A bstract 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 $$ \sqrt{s} $$ s = 7TeV 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 analysis 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.