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

Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. Aglieri and
Agnello, M. and Agrawal, N. and Ahammed, Z. and Ahn, S. U. and Aimo, I.
and Aiola, S. and Ajaz, M. and Akindinov, A. and Alam, S. N. and
Aleksandrov, D. and Alessandro, B. and Alexandre, D. and Molina, R.
Alfaro and Alici, A. and Alkin, A. and Almaraz, J. R. M. and Alme, J.
and Alt, T. and Altinpinar, S. and Altsybeev, I. and Prado, C. Alves
Garcia and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J.
and Anticic, T. and Antinori, F. and Antonioli, P. and Aphecetche, L.
and Appelshaeuser, H. and Arcelli, S. and Armesto, N. and Arnaldi, R.
and Arsene, I. C. and Arslandok, M. and Audurier, B. and Augustinus, A.
and Averbeck, R. and Azmi, M. D. and Bach, M. and Badala, A. and Baek,
Y. W. and Bagnasco, S. and Bailhache, R. and Bala, R. and Baldisseri, A.
and Pedrosa, F. Baltasar Dos Santos and Baral, R. C. and Barbano, A. M.
and Barbera, R. and Barile, F. and Barnafoedi, G. G. and Barnby, L. S.
and Barret, V. and Bartalini, P. and Barth, K. and Bartke, J. and
Bartsch, E. and Basile, M. and Bastid, N. and Basu, S. and Bathen, B.
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Berenyi, D. and Bertens, R. A. and Berzano, D. and Betev, L. and Bhasin,
A. and Bhat, I. R. and Bhati, A. K. and Bhattacharjee, B. and Bhom, J.
and Bianchi, L. and Bianchi, N. and Bianchin, C. and Bielcik, J. and
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Bjelogrlic, S. and Blair, J. T. and Blanco, F. and Blau, D. and Blume,
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Bombara, M. and Book, J. and Borel, H. and Borissov, A. and Borri, M.
and Bossu, F. and Botta, E. and Boettger, S. and Braun-Munzinger, P. and
Bregant, M. and Breitner, T. and Broker, T. A. and Browning, T. A. and
Broz, M. and Brucken, E. J. and Bruna, E. and Bruno, G. E. and Budnikov,
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Cai, X. and Caines, H. and Diaz, L. Calero and Caliva, A. and Villar, E.
Calvo and Camerini, P. and Carena, F. and Carena, W. and Carnesecchi, F.
and Castellanos, J. Castillo and Castro, A. J. and Casula, E. A. R. and
Cavicchioli, C. and Sanchez, C. Ceballos and Cepila, J. and Cerello, P.
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ALICE Collaboration

Adam, J. and Adamova, D. and Aggarwal, M. M. and Rinella, G. Aglieri and Agnello, M. and Agrawal, N. and Ahammed, Z. and Ahn, S. U. and Aimo, I. and Aiola, S. and Ajaz, M. and Akindinov, A. and Alam, S. N. and Aleksandrov, D. and Alessandro, B. and Alexandre, D. and Molina, R. Alfaro and Alici, A. and Alkin, A. and Almaraz, J. R. M. and Alme, J. and Alt, T. and Altinpinar, S. and Altsybeev, I. and Prado, C. Alves Garcia and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Anticic, T. and Antinori, F. and Antonioli, P. and Aphecetche, L. and Appelshaeuser, H. and Arcelli, S. and Armesto, N. and Arnaldi, R. and Arsene, I. C. and Arslandok, M. and Audurier, B. and Augustinus, A. and Averbeck, R. and Azmi, M. D. and Bach, M. and Badala, A. and Baek, Y. W. and Bagnasco, S. and Bailhache, R. and Bala, R. and Baldisseri, A. and Pedrosa, F. Baltasar Dos Santos and Baral, R. C. and Barbano, A. M. and Barbera, R. and Barile, F. and Barnafoedi, G. G. and Barnby, L. S. and Barret, V. and Bartalini, P. and Barth, K. and Bartke, J. and Bartsch, E. and Basile, M. and Bastid, N. and Basu, S. and Bathen, B. and Batigne, G. and Camejo, A. Batista and Batyunya, B. and Batzing, P. C. and Bearden, I. G. and Beck, H. and Bedda, C. and Behera, N. K. and Belikov, I. and Bellini, F. and Martinez, H. Bello and Bellwied, R. and Belmont, R. and Belmont-Moreno, E. and Belyaev, V. and Bencedi, G. and Beole, S. and Berceanu, I. and Bercuci, A. and Berdnikov, Y. and Berenyi, D. and Bertens, R. A. and Berzano, D. and Betev, L. and Bhasin, A. and Bhat, I. R. and Bhati, A. K. and Bhattacharjee, B. and Bhom, J. and Bianchi, L. and Bianchi, N. and Bianchin, C. and Bielcik, J. and Bielcikova, J. and Bilandzic, A. and Biswas, R. and Biswas, S. and Bjelogrlic, S. and Blair, J. T. and Blanco, F. and Blau, D. and Blume, C. and Bock, F. and Bogdanov, A. and Boggild, H. and Boldizsar, L. and Bombara, M. and Book, J. and Borel, H. and Borissov, A. and Borri, M. and Bossu, F. and Botta, E. and Boettger, S. and Braun-Munzinger, P. and Bregant, M. and Breitner, T. and Broker, T. A. and Browning, T. A. and Broz, M. and Brucken, E. J. and Bruna, E. and Bruno, G. E. and Budnikov, D. and Buesching, H. and Bufalino, S. and Buncic, P. and Busch, O. and Buthelezi, Z. and Butt, J. B. and Buxton, J. T. and Caffarri, D. and Cai, X. and Caines, H. and Diaz, L. Calero and Caliva, A. and Villar, E. Calvo and Camerini, P. and Carena, F. and Carena, W. and Carnesecchi, F. and Castellanos, J. Castillo and Castro, A. J. and Casula, E. A. R. and Cavicchioli, C. and Sanchez, C. Ceballos and Cepila, J. and Cerello, P. and Cerkala, J. and Chang, B. and Chapeland, S. and Chartier, M. and Charvet, J. L. and Chattopadhyay, S. and Chattopadhyay, S. and Chelnokov, V. and Cherney, M. and Cheshkov, C. and Cheynis, B. and Barroso, V. Chibante and Chinellato, D. D. and Chochula, P. and Choi, K. and Chojnacki, M. and Choudhury, S. and Christakoglou, P. and Christensen, C. H. and Christiansen, P. and Chujo, T. and Chung, S. U. and Chunhui, Z. and Cicalo, C. and Cifarelli, L. and Cindolo, F. and Cleymans, J. and Colamaria, F. and Colella, D. and Collu, A. and Colocci, M. and Balbastre, G. Conesa and Del Valle, Z. Conesa and Connors, M. E. and Contreras, J. G. and Cormier, T. M. and Morales, Y. Corrales and Maldonado, I. Cortes and Cortese, P. and Cosentino, M. R. and Costa, F. and Crochet, P. and Albino, R. Cruz and Cuautle, E. and Cunqueiro, L. and Dahms, T. and Dainese, A. and Danu, A. and Das, D. and Das, I. and Das, S. and Dash, A. and Dash, S. and De, S. and De Caro, A. and de Cataldo, G. and de Cuveland, J. and De Falco, A. and De Gruttola, D. and De Marco, N. and De Pasquale, S. and Deisting, A. and Deloff, A. and Denes, E. and D'Erasmo, G. and Di Bari, D. and Di Mauro, A. and Di Nezza, P. and Corchero, M. A. Diaz and Dietel, T. and Dillenseger, P. and Divia, R. and Djuvsland, O. and Dobrin, A. and Dobrowolski, T. and Gimenez, D. Domenicis and Doenigus, B. and Dordic, O. and Drozhzhova, T. and Dubey, A. K. and Dubla, A. and Ducroux, L. and Dupieux, P. and Ehlers, R. J. and Elia, D. and Engel, H. and Erazmus, B. and Erdemir, I. and Erhardt, F. and Eschweiler, D. and Espagnon, B. and Estienne, M. and Esumi, S. and Eum, J. and Evans, D. and Evdokimov, S. and Eyyubova, G. and Fabbietti, L. and Fabris, D. and Faivre, J. and Fantoni, A. and Fasel, M. and Feldkamp, L. and Felea, D. and Feliciello, A. and Feofilov, G. and Ferencei, J. and Tellez, A. Fernandez and Ferreiro, E. G. and Ferretti, A. and Festanti, A. and Feuillard, V. J. G. and Figiel, J. and Figueredo, M. A. S. and Filchagin, S. and Finogeev, D. and Fiore, E. M. and Fleck, M. G. and Floris, M. and Foertsch, S. and Foka, P. and Fokin, S. and Fragiacomo, E. and Francescon, A. and Frankenfeld, U. and Fuchs, U. and Furget, C. and Furs, A. and Girard, M. Fusco and Gaardhoje, J. J. and Gagliardi, M. and Gago, A. M. and Gallio, M. and Gangadharan, D. R. and Ganoti, P. and Gao, C. and Garabatos, C. and Garcia-Solis, E. and Gargiulo, C. and Gasik, P. and Germain, M. and Gheata, A. and Gheata, M. and Ghosh, P. and Ghosh, S. K. and Gianotti, P. and Giubellino, P. and Giubilato, P. and Gladysz-Dziadus, E. and Glaessel, P. and Coral, D. M. Gomez and Ramirez, A. Gomez and Gonzalez-Zamora, P. and Gorbunov, S. and Goerlich, L. and Gotovac, S. and Grabski, V. and Graczykowski, L. K. and Graham, K. L. and Grelli, A. and Grigoras, A. and Grigoras, C. and Grigoriev, V. and Grigoryan, A. and Grigoryan, S. and Grinyov, B. and Grion, N. and Grosse-Oetringhaus, J. F. and Grossiord, J. -Y. and Grosso, R. and Guber, F. and Guernane, R. and Guerzoni, B. and Gulbrandsen, K. and Gulkanyan, H. and Gunji, T. and Gupta, A. and Gupta, R. and Haake, R. and Haaland, O. and Hadjidakis, C. and Haiduc, M. and Hamagaki, H. and Hamar, G. and Hansen, A. and Harris, J. W. and Hartmann, H. and Harton, A. and Hatzifotiadou, D. and Hayashi, S. and Heckel, S. T. and Heide, M. and Helstrup, H. and Herghelegiu, A. and Corral, G. Herrera and Hess, B. A. and Hetland, K. F. and Hilden, T. E. and Hillemanns, H. and Hippolyte, B. and Hosokawa, R. and Hristov, P. and Huang, M. and Humanic, T. J. and Hussain, N. and Hussain, T. and Hutter, D. and Hwang, D. S. and Ilkaev, R. and Ilkiv, I. and Inaba, M. and Ippolitov, M. and Irfan, M. and Ivanov, M. and Ivanov, V. and Izucheev, V. and Jacobs, P. M. and Jadlovska, S. and Jahnke, C. and Jang, H. J. and Janik, M. A. and Jayarathna, P. H. S. Y. and Jena, C. and Jena, S. and Bustamante, R. T. Jimenez and Jones, P. G. and Jung, H. and Jusko, A. and Kalinak, P. and Kalweit, A. and Kamin, J. and Kang, J. H. and Kaplin, V. and Kar, S. and Uysal, A. Karasu and Karavichev, O. and Karavicheva, T. and Karayan, L. and Karpechev, E. and Kebschull, U. and Keidel, R. and Keijdener, D. L. D. and Keil, M. and Khan, K. H. and Khan, M. M. and Khan, P. and Khan, S. A. and Khanzadeev, A. and Kharlov, Y. and Kileng, B. and Kim, B. and Kim, D. W. and Kim, D. J. and Kim, H. and Kim, J. S. and Kim, M. and Kim, M. and Kim, S. and Kim, T. and Kirsch, S. and Kisel, I. and Kiselev, S. and Kisiel, A. and Kiss, G. and Klay, J. L. and Klein, C. and Klein, J. and Klein-Boesing, C. and Kluge, A. and Knichel, M. L. and Knospe, A. G. and Kobayashi, T. and Kobdaj, C. and Kofarago, M. and Kollegger, T. and Kolojvari, A. and Kondratiev, V. and Kondratyeva, N. and Kondratyuk, E. and Konevskikh, A. and Kopcik, M. and Kour, M. and Kouzinopoulos, C. and Kovalenko, O. and Kovalenko, V. and Kowalski, M. and Meethaleveedu, G. Koyithatta and Kral, J. and Kralik, I. and Kravcakova, A. and Krelina, M. and Kretz, M. and Krivda, M. and Krizek, F. and Kryshen, E. and Krzewicki, M. and Kubera, A. M. and Kucera, V. and Kugathasan, T. and Kuhn, C. and Kuijer, P. G. and Kulakov, I. and Kumar, A. and Kumar, J. and Kumar, L. and Kurashvili, P. and Kurepin, A. and Kurepin, A. B. and Kuryakin, A. and Kushpil, S. and Kweon, M. J. and Kwon, Y. and La Pointe, S. L. and La Rocca, P. and Fernandes, C. Lagana and Lakomov, I. and Langoy, R. and Lara, C. and Lardeux, A. and Lattuca, A. and Laudi, E. and Lea, R. and Leardini, L. and Lee, G. R. and Lee, S. and Legrand, I. and Lehas, F. and Lemmon, R. C. and Lenti, V. and Leogrande, E. and Monzon, I. Leon and Leoncino, M. and Levai, P. and Li, S. and Li, X. and Lien, J. and Lietava, R. and Lindal, S. and Lindenstruth, V. and Lippmann, C. and Lisa, M. A. and Ljunggren, H. M. and Lodato, D. F. and Loenne, P. I. and Loginov, V. and Loizides, C. and Lopez, X. and Torres, E. Lopez and Lowe, A. and Luettig, P. and Lunardon, M. and Luparello, G. and Luz, P. H. F. N. D. and Maevskaya, A. and Mager, M. and Mahajan, S. and Mahmood, S. M. and Maire, A. and Majka, R. D. and Malaev, M. and Cervantes, I. Maldonado and Malinina, L. and Mal'Kevich, D. and Malzacher, P. and Mamonov, A. and Manko, V. and Manso, F. and Manzari, V. and Marchisone, M. and Mares, J. and Margagliotti, G. V. and Margotti, A. and Margutti, J. and Marin, A. and Markert, C. and Marquard, M. and Martin, N. A. and Blanco, J. Martin and Martinengo, P. and Martinez, M. I. and Garcia, G. Martinez and Pedreira, M. Martinez and Martynov, Y. and Mas, A. and Masciocchi, S. and Masera, M. and Masoni, A. and Massacrier, L. and Mastroserio, A. and Masui, H. and Matyja, A. and Mayer, C. and Mazer, J. and Mazzoni, M. A. and Mcdonald, D. and Meddi, F. and Melikyan, Y. and Menchaca-Rocha, A. and Meninno, E. and Perez, J. Mercado and Meres, M. and Miake, Y. and Mieskolainen, M. M. and Mikhaylov, K. and Milano, L. and Milosevic, J. and Minervini, L. M. and Mischke, A. and Mishra, A. N. and Miskowiec, D. and Mitra, J. and Mitu, C. M. and Mohammadi, N. and Mohanty, B. and Molnar, L. and Zetina, L. Montano and Montes, E. and Morando, M. and De Godoy, D. A. Moreira and Moretto, S. and Morreale, A. and Morsch, A. and Muccifora, V. and Mudnic, E. and Muehlheim, D. and Muhuri, S. and Mukherjee, M. and Mulligan, J. D. and Munhoz, M. G. and Murray, S. and Musa, L. and Musinsky, J. and Nandi, B. K. and Nania, R. and Nappi, E. and Naru, M. U. and Nattrass, C. and Nayak, K. and Nayak, T. K. and Nazarenko, S. and Nedosekin, A. and Nellen, L. and Ng, F. and Nicassio, M. and Niculescu, M. and Niedziela, J. and Nielsen, B. S. and Nikolaev, S. and Nikulin, S. and Nikulin, V. and Noferini, F. and Nomokonov, P. and Nooren, G. and Noris, J. C. C. and Norman, J. and Nyanin, A. and Nystrand, J. and Oeschler, H. and Oh, S. and Oh, S. K. and Ohlson, A. and Okatan, A. and Okubo, T. and Olah, L. and Oleniacz, J. and Da Silva, A. C. Oliveira and Oliver, M. H. and Onderwaater, J. and Oppedisano, C. and Orava, R. and Velasquez, A. Ortiz and Oskarsson, A. and Otwinowski, J. and Oyama, K. and Ozdemir, M. and Pachmayer, Y. and Pagano, P. and Paic, G. and Pajares, C. and Pal, S. K. and Pan, J. and Pandey, A. K. and Pant, D. and Papcun, P. and Papikyan, V. and Pappalardo, G. S. and Pareek, P. and Park, W. J. and Parmar, S. and Passfeld, A. and Paticchio, V. and Patra, R. N. and Paul, B. and Peitzmann, T. and Da Costa, H. Pereira and De Oliveira Filho, E. Pereira and Peresunko, D. and Lara, C. E. Perez and Lezama, E. Perez and Peskov, V. and Pestov, Y. and Petracek, V. and Petrov, V. and Petrovici, M. and Petta, C. and Piano, S. and Pikna, M. and Pillot, P. and Pinazza, O. and Pinsky, L. and Piyarathna, D. B. and Ploskon, M. and Planinic, M. and Pluta, J. and Pochybova, S. and Podesta-Lerma, P. L. M. and Poghosyan, M. G. and Polichtchouk, B. and Poljak, N. and Poonsawat, W. and Pop, A. and Porteboeuf-Houssais, S. and Porter, J. and Pospisil, J. and Prasad, S. K. and Preghenella, R. and Prino, F. and Pruneau, C. A. and Pshenichnov, I. and Puccio, M. and Puddu, G. and Pujahari, P. and Punin, V. and Putschke, J. and Qvigstad, H. and Rachevski, A. and Raha, S. and Rajput, S. and Rak, J. and Rakotozafindrabe, A. and Ramello, L. and Raniwala, R. and Raniwala, S. and Rasanen, S. S. and Rascanu, B. T. and Rathee, D. and Read, K. F. and Real, J. S. and Redlich, K. and Reed, R. J. and Rehman, A. and Reichelt, P. and Reidt, F. and Ren, X. and Renfordt, R. and Reolon, A. R. and Reshetin, A. and Rettig, F. and Revol, J. -P. and Reygers, K. and Riabov, V. and Ricci, R. A. and Richert, T. and Richter, M. and Riedler, P. and Riegler, W. and Riggi, F. and Ristea, C. and Rivetti, A. and Rocco, E. and Cahuantzi, M. Rodriguez and Manso, A. Rodriguez and Roed, K. and Rogochaya, E. and Rohr, D. and Rohrich, D. and Romita, R. and Ronchetti, F. and Ronflette, L. and Rosnet, P. and Rossi, A. and Roukoutakis, F. and Roy, A. and Roy, C. and Roy, P. and Montero, A. J. Rubio and Rui, R. and Russo, R. and Ryabinkin, E. and Ryabov, Y. and Rybicki, A. and Sadovsky, S. and Safarik, K. and Sahlmuller, B. and Sahoo, P. and Sahoo, R. and Sahoo, S. and Sahu, P. K. and Saini, J. and Sakai, S. and Saleh, M. A. and Salgado, C. A. and Salzwedel, J. and Sambyal, S. and Samsonov, V. and Castro, X. Sanchez and Sandor, L. . and Sandoval, A. and Sano, M. and Sarkar, D. and Scapparone, E. and Scarlassara, F. and Scharenberg, R. P. and Schiaua, C. and Schicker, R. and Schmidt, C. and Schmidt, H. R. and Schuchmann, S. and Schukraft, J. and Schulc, M. and Schuster, T. and Schutz, Y. and Schwarz, K. and Schweda, K. and Scioli, G. and Scomparin, E. and Scott, R. and Seger, J. E. and Sekiguchi, Y. and Sekihata, D. and Selyuzhenkov, I. and Senosi, K. and Seo, J. and Serradilla, E. and Sevcenco, A. and Shabanov, A. and Shabetai, A. and Shadura, O. and Shahoyan, R. and Shangaraev, A. and Sharma, A. and Sharma, M. and Sharma, M. and Sharma, N. and Shigaki, K. and Shtejer, K. and Sibiriak, Y. and Siddhanta, S. and Sielewicz, K. M. and Siemiarczuk, T. and Silvermyr, D. and Silvestre, C. and Simatovic, G. and Simonetti, G. and Singaraju, R. and Singh, R. and Singha, S. and Singhal, V. and Sinha, B. C. and Sinha, T. and Sitar, B. and Sitta, M. and Skaali, T. B. and Slupecki, M. and Smirnov, N. and Snellings, R. J. M. and Snellman, T. W. and Sogaard, C. and Soltz, R. and Song, J. and Song, M. and Song, Z. and Soramel, F. and Sorensen, S. and Spacek, M. and Spiriti, E. and Sputowska, I. and Spyropoulou-Stassinaki, M. and Srivastava, B. K. and Stachel, J. and Stan, I. and Stefanek, G. and Steinpreis, M. and Stenlund, E. and Steyn, G. and Stiller, J. H. and Stocco, D. and Strmen, P. and Suaide, A. A. P. and Sugitate, T. and Suire, C. and Suleymanov, M. and Sultanov, R. and Sumbera, M. . and Symons, T. J. M. and Szabo, A. and de Toledo, A. Szanto and Szarka, I. and Szczepankiewicz, A. and Szymanski, M. and Takahashi, J. and Tambave, G. J. and Tanaka, N. and Tangaro, M. A. and Takaki, J. D. Tapia and Peloni, A. Tarantola and Tarhini, M. and Tariq, M. and Tarzila, M. G. and Tauro, A. and Munoz, G. Tejeda and Telesca, A. and Terasaki, K. and Terrevoli, C. and Teyssier, B. and Thaeder, J. and Thomas, D. and Tieulent, R. and Timmins, A. R. and Toia, A. and Trogolo, S. and Trubnikov, V. and Trzaska, W. H. and Tsuji, T. and Tumkin, A. and Turrisi, R. and Tveter, T. S. and Ullaland, K. and Uras, A. and Usai, G. L. and Utrobicic, A. and Vajzer, M. and Vala, M. and Palomo, L. Valencia and Vallero, S. and Van der Maarel, J. and Van Hoorne, J. W. and van Leeuwen, M. and Vanat, T. and Vyvre, P. Vande and Varga, D. and Vargas, A. and Vargyas, M. and Varma, R. and Vasileiou, M. and Vasiliev, A. and Vauthier, A. and Vechernin, V. and Veen, A. M. and Veldhoen, M. and Velure, A. and Venaruzzo, M. and Vercellin, E. and Limon, S. Vergara and Vernet, R. and Verweij, M. and Vickovic, L. and Viesti, G. and Viinikainen, J. and Vilakazi, Z. and Baillie, O. Villalobos and Vinogradov, A. and Vinogradov, L. and Vinogradov, Y. and Virgili, T. and Vislavicius, V. and Viyogi, Y. P. and Vodopyanov, A. and Voelkl, M. A. and Voloshin, K. and Voloshin, S. A. and Volpe, G. and von Haller, B. and Vorobyev, I. and Vranic, D. and Vrlakova, J. and Vulpescu, B. and Vyushin, A. and Wagner, B. and Wagner, J. and Wang, H. and Wang, M. and Wang, Y. and Watanabe, D. and Watanabe, Y. and Weber, M. and Weber, S. G. and Wessels, J. P. and Westerhoff, U. and Wiechula, J. and Wikne, J. and Wilde, M. and Wilk, G. and Wilkinson, J. and Williams, M. C. S. and Windelband, B. and Winn, M. and Yaldo, C. G. and Yang, H. and Yang, P. and Yano, S. and Yin, Z. and Yokoyama, H. and Yoo, I. -K. and Yurchenko, V. and Yushmanov, I. and Zaborowska, A. and Zaccolo, V. and Zaman, A. and Zampolli, C. and Zanoli, H. J. C. and Zaporozhets, S. and Zardoshti, N. and Zarochentsev, A. and Zavada, P. and Zaviyalov, N. and Zbroszczyk, H. and Zgura, I. S. and Zhalov, M. and Zhang, H. and Zhang, X. and Zhang, Y. and Zhao, C. and Zhigareva, N. and Zhou, D. and Zhou, Y. and Zhou, Z. and Zhu, H. and Zhu, J. and Zhu, X. and Zichichi, A. and Zimmermann, A. and Zimmermann, M. B. and Zinovjev, G. and Zyzak, M. and ALICE Collaboration... Show more Show less

Date

2016

URI

http://hdl.handle.net/20.500.12498/4709

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Abstract

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.... Show more Show less

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WoS İndeksli Yayınlar Koleksiyonu [274]