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Centrality dependence of pion freeze-out radii in Pb-Pb collisions at $\sqrt{\mathbf{s_{NN}}}$=2.76 TeV

We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV as a function of collision centrality and the average transverse momentum of the pair $k_{\rm T}$. Three-dimensional sizes of the system (femtoscopic rad...

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Autores principales: Adam, Jaroslav, Adamova, Dagmar, Aggarwal, Madan Mohan, Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Neelima, Ahammed, Zubayer, Ahn, Sang Un, Aimo, Ilaria, Aiola, Salvatore, Ajaz, Muhammad, Akindinov, Alexander, Alam, Sk Noor, Aleksandrov, Dmitry, Alessandro, Bruno, Alexandre, Didier, Alfaro Molina, Jose Ruben, Alici, Andrea, Alkin, Anton, Millan Almaraz, Jesus Roberto, Alme, Johan, Alt, Torsten, Altinpinar, Sedat, Altsybeev, Igor, Alves Garcia Prado, Caio, Andrei, Cristian, Andronic, Anton, Anguelov, Venelin, Anielski, Jonas, Anticic, Tome, Antinori, Federico, Antonioli, Pietro, Aphecetche, Laurent Bernard, Appelshaeuser, Harald, Arcelli, Silvia, Armesto Perez, Nestor, Arnaldi, Roberta, Arsene, Ionut Cristian, Arslandok, Mesut, Audurier, Benjamin, Augustinus, Andre, Averbeck, Ralf Peter, Azmi, Mohd Danish, Bach, Matthias Jakob, Badala, Angela, Baek, Yong Wook, Bagnasco, Stefano, Bailhache, Raphaelle Marie, Bala, Renu, Baldisseri, Alberto, Baltasar 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Hugo, Maevskaya, Alla, Mager, Magnus, Mahajan, Sanjay, Mahmood, Sohail Musa, Maire, Antonin, Majka, Richard Daniel, Malaev, Mikhail, Maldonado Cervantes, Ivonne Alicia, Malinina, Liudmila, Mal'Kevich, Dmitry, Malzacher, Peter, Mamonov, Alexander, Manko, Vladislav, Manso, Franck, Manzari, Vito, Marchisone, Massimiliano, Mares, Jiri, Margagliotti, Giacomo Vito, Margotti, Anselmo, Margutti, Jacopo, Marin, Ana Maria, Markert, Christina, Marquard, Marco, Martin, Nicole Alice, Martin Blanco, Javier, Martinengo, Paolo, Martinez Hernandez, Mario Ivan, Martinez-Garcia, Gines, Martinez Pedreira, Miguel, Martynov, Yevgen, Mas, Alexis Jean-Michel, Masciocchi, Silvia, Masera, Massimo, Masoni, Alberto, Massacrier, Laure Marie, Mastroserio, Annalisa, Masui, Hiroshi, Matyja, Adam Tomasz, Mayer, Christoph, Mazer, Joel Anthony, Mazzoni, Alessandra Maria, Mcdonald, Daniel, Meddi, Franco, Melikyan, Yuri, Menchaca-Rocha, Arturo Alejandro, Meninno, Elisa, Mercado-Perez, Jorge, Meres, Michal, Miake, Yasuo, Mieskolainen, Matti Mikael, Mikhaylov, Konstantin, Milano, Leonardo, Milosevic, Jovan, Minervini, Lazzaro Manlio, Mischke, Andre, Mishra, Aditya Nath, Miskowiec, Dariusz Czeslaw, Mitra, Jubin, Mitu, Ciprian Mihai, Mohammadi, Naghmeh, Mohanty, Bedangadas, Molnar, Levente, Montano Zetina, Luis Manuel, Montes Prado, Esther, Morando, Maurizio, Moreira De Godoy, Denise Aparecida, Moretto, Sandra, Morreale, Astrid, Morsch, Andreas, Muccifora, Valeria, Mudnic, Eugen, Muhlheim, Daniel Michael, Muhuri, Sanjib, Mukherjee, Maitreyee, Mulligan, James Declan, Gameiro Munhoz, Marcelo, Murray, Sean, Musa, Luciano, Musinsky, Jan, Nandi, Basanta Kumar, Nania, Rosario, Nappi, Eugenio, Naru, Muhammad Umair, Nattrass, Christine, Nayak, Kishora, Nayak, Tapan Kumar, Nazarenko, Sergey, Nedosekin, Alexander, Nellen, Lukas, Ng, Fabian, Nicassio, Maria, Niculescu, Mihai, Niedziela, Jeremi, Nielsen, Borge Svane, Nikolaev, Sergey, Nikulin, Sergey, Nikulin, Vladimir, Noferini, Francesco, Nomokonov, Petr, Nooren, Gerardus, Cabanillas Noris, Juan Carlos, Norman, Jaime, Nyanin, Alexander, Nystrand, Joakim Ingemar, Oeschler, Helmut Oskar, Oh, Saehanseul, Oh, Sun Kun, Ohlson, Alice Elisabeth, Okatan, Ali, Okubo, Tsubasa, Olah, Laszlo, Oleniacz, Janusz, Oliveira Da Silva, Antonio Carlos, Oliver, Michael Henry, Onderwaater, Jacobus, Oppedisano, Chiara, Orava, Risto, Ortiz Velasquez, Antonio, Oskarsson, Anders Nils Erik, Otwinowski, Jacek Tomasz, Oyama, Ken, Ozdemir, Mahmut, Pachmayer, Yvonne Chiara, Pagano, Paola, Paic, Guy, Pajares Vales, Carlos, Pal, Susanta Kumar, Pan, Jinjin, Pandey, Ashutosh Kumar, Pant, Divyash, Papcun, Peter, Papikyan, Vardanush, Pappalardo, Giuseppe, Pareek, Pooja, Park, Woojin, Parmar, Sonia, Passfeld, Annika, Paticchio, Vincenzo, Patra, Rajendra Nath, Paul, Biswarup, Peitzmann, Thomas, Pereira Da Costa, Hugo Denis Antonio, Pereira De Oliveira Filho, Elienos, Peresunko, Dmitry Yurevich, Perez Lara, Carlos Eugenio, Perez Lezama, Edgar, Peskov, Vladimir, Pestov, Yury, 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Yokoyama, Hiroki, Yoo, In-Kwon, Yurchenko, Volodymyr, Yushmanov, Igor, Zaborowska, Anna, Zaccolo, Valentina, Zaman, Ali, Zampolli, Chiara, Correia Zanoli, Henrique Jose, Zaporozhets, Sergey, Zardoshti, Nima, Zarochentsev, Andrey, Zavada, Petr, Zavyalov, Nikolay, Zbroszczyk, Hanna Paulina, Zgura, Sorin Ion, Zhalov, Mikhail, Zhang, Haitao, Zhang, Xiaoming, Zhang, Yonghong, Zhao, Chengxin, Zhigareva, Natalia, Zhou, Daicui, Zhou, You, Zhou, Zhuo, Zhu, Hongsheng, Zhu, Jianhui, Zhu, Xiangrong, Zichichi, Antonino, Zimmermann, Alice, Zimmermann, Markus Bernhard, Zinovjev, Gennady, Zyzak, Maksym
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevC.93.024905
http://cds.cern.ch/record/2037814
Descripción
Sumario:We report on the measurement of freeze-out radii for pairs of identical-charge pions measured in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV as a function of collision centrality and the average transverse momentum of the pair $k_{\rm T}$. Three-dimensional sizes of the system (femtoscopic radii), as well as direction-averaged one-dimensional radii are extracted. The radii decrease with $k_{\rm T}$, 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 $\left< \mathrm{d}N_{\rm ch}/\mathrm{d}\eta \right>^{1/3}$. This behaviour is compared to world data on femtoscopic radii in heavy-ion collisions. While the dependence is qualitatively similar to results at smaller $\sqrt{s_{\rm NN}}$, a decrease in the $R_{\rm out}/R_{\rm side}$ ratio is seen, which is in qualitative agreement with specific predictions from hydrodynamic models. The results provide further evidence for the production of a collective, strongly coupled system in heavy-ion collisions at the LHC.