Centrality dependence of pion freeze-out radii in Pb-Pb collisions at root s(NN)=2.76 TeV

Autor: Adam, J, Adamova, D, Aggarwal, Mm, Rinella, Ga, Agnello, M, Agrawal, N, Ahammed, Z, Ahn, Su, Aimo, I, Aiola, S, Ajaz, M, Akindinov, A, Alam, Sn, Aleksandrov, D, Alessandro, B, Alexandre, D, Molina, Ra, Alici, A, Alkin, A, Almaraz, Jrm, Alme, J, Alt, T, Altinpinar, S, Altsybeev, I, Prado, Cag, Andrei, C, Andronic, A, Anguelov, V, Anielski, J, Anticic, T, Antinori, F, Antonioli, P, Aphecetche, L, Appelshauser, H, Arcelli, S, Armesto, N, Arnaldi, R, Arsene, Ic, Arslandok, M, Audurier, B, Augustinus, A, Averbeck, R, Azmi, Md, Bach, M, Badala, A, Baek, Yw, Bagnasco, S, Bailhache, R, Bala, R, Baldisseri, A, Pedrosa, Fbd, Baral, Rc, Barbano, Am, Barbera, Roberto, Barile, F, Barnafodi, Gg, Barnby, Ls, Barret, V, Bartalini, P, Barth, K, Bartke, J, Bartsch, E, Basile, M, Bastid, N, Basu, S, Bathen, B, Batigne, G, Camejo, Ab, Batyunya, B, Batzing, Pc, Bearden, Ig, Beck, H, Bedda, C, Behera, Nk, Belikov, I, Bellini, F, Martinez, Hb, Bellwied, R, Belmont, R, Belmont Moreno, E, Belyaev, V, Bencedi, G, Beole, S, Berceanu, I, Bercuci, A, Berdnikov, Y, Berenyi, D, Bertens, Ra, Berzano, D, Betev, L, Bhasin, A, Bhat, Ir, Bhati, Ak, Bhattacharjee, B, Bhom, J, Bianchi, L, Bianchi, N, Bianchin, C, Bielcik, J, Bielcikova, J, Bilandzic, A, Biswas, R, Biswas, S, Bjelogrlic, S, Blair, Jt, Blanco, F, Blau, D, Blume, C, Bock, F, Bogdanov, A, Boggild, H, Boldizsar, L, Bombara, M, Book, J, Borel, H, Borissov, A, Borri, M, Bossu, F, Botta, E, Bottger, S, Braun Munzinger, P, Bregant, M, Breitner, T, Broker, Ta, Browning, Ta, Broz, M, Brucken, Ej, Bruna, E, Bruno, Ge, Budnikov, D, Buesching, H, Bufalino, S, Buncic, P, Busch, O, Buthelezi, Z, Butt, Jb, Buxton, Jt, Caffarri, D, Cai, X, Caines, H, Diaz, Lc, Caliva, A, Villar, Ec, Camerini, P, Carena, F, Carena, W, Carnesecchi, F, Castellanos, Jc, Castro, Aj, Casula, Ear, Cavicchioli, C, Sanchez, Cc, Cepila, J, Cerello, P, Cerkala, J, Chang, B, Chapeland, S, Chartier, M, Charvet, Jl, Chattopadhyay, S, Chelnokov, V, Cherney, M, Cheshkov, C, 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Jazyk: angličtina
Rok vydání: 2016
Předmět:
Popis: We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb-Pb collisions at root s(NN) = 2.76 TeV as a function of collision centrality and the average transverse momentum of the pair k(T). Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged one-dimensional radii are extracted. The radii decrease with k(T), following a power-law behavior. This is qualitatively consistent with expectations from a collectively expanding system, produced in hydrodynamic calculations. The radii also scale linearly with < dN(ch)/d eta >(1/3). This behavior is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller root s(NN), a decrease in the ratio R-out/R-side is seen, which is in qualitative agreement with a specific prediction from hydrodynamic models: a change from inside-out to outside-in freeze-out configuration. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the CERN Large Hadron Collider.
Databáze: OpenAIRE