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We present measurements of two-particle correlations with neutral pion trigger particles of transverse momenta 8>pTtrig>16 GeV/c and associated charged particles of 0.5>pTassoc>10 GeV/c versus the azimuthal angle difference Δφ at midrapidity in pp and central Pb–Pb collisions at sNN=2.76 TeV with ALICE. The new measurements exploit associated charged hadrons down to 0.5 GeV/c, which significantly extends our previous measurement that only used charged hadrons above 3 GeV/c. After subtracting the contributions of the flow background, v2 to v5, the per-trigger yields are extracted for |Δφ|>0.7 on the near and for |Δφ−π|>1.1 on the away side. The ratio of per-trigger yields in Pb–Pb to those in pp collisions, IAA, is measured on the near and away side for the 0–10% most central Pb–Pb collisions. On the away side, the per-trigger yields in Pb–Pb are strongly suppressed to the level of IAA≈0.6 for pTassoc<3 GeV/c, while with decreasing momenta an enhancement develops reaching about 5 at low pTassoc. On the near side, an enhancement of IAA between 1.2 at the highest to 1.8 at the lowest pTassoc is observed. The data are compared to parton-energy-loss predictions of the JEWEL and AMPT event generators, as well as to a perturbative QCD calculation with medium-modified fragmentation functions. All calculations qualitatively describe the away-side suppression at high pTassoc. Only AMPT captures the enhancement at low pTassoc, both on the near and away side. However, it also underpredicts IAA above 5 GeV/c, in particular on the near-side.
Adam, J., Adamová, D., Aggarwal, M., Aglieri Rinella, G., Agnello, M., Agrawal, N., et al. (2016). Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV. PHYSICS LETTERS. SECTION B, 763, 238-250 [10.1016/j.physletb.2016.10.048].
Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV
Adam, J.;Adamová, D.;Aggarwal, M. M.;Aglieri Rinella, G.;Agnello, M.;Agrawal, N.;Ahammed, Z.;Ahmad, S.;Ahn, S. U.;Aiola, S.;Akindinov, A.;Alam, S. N.;Albuquerque, D. S. D.;Aleksandrov, D.;Alessandro, B.;Alexandre, D.;Alfaro Molina, R.;ALICI, ANDREA;Alkin, A.;Alme, J.;Alt, T.;Altinpinar, S.;Altsybeev, I.;Alves Garcia Prado, C.;An, M.;Andrei, C.;Andrews, H. A.;Andronic, A.;Anguelov, V.;Anson, C.;Antičić, T.;Antinori, F.;Antonioli, P.;Aphecetche, L.;Appelshäuser, H.;ARCELLI, SILVIA;Arnaldi, R.;Arnold, O. W.;Arsene, I. C.;Arslandok, M.;Audurier, B.;Augustinus, A.;Averbeck, R.;Azmi, M. D.;Badalà, A.;Baek, Y. W.;Bagnasco, S.;Bailhache, R.;Bala, R.;Balasubramanian, S.;Baldisseri, A.;Baral, R. C.;Barbano, A. M.;Barbera, R.;Barile, F.;Barnaföldi, G. G.;Barnby, L. S.;Barret, V.;Bartalini, P.;Barth, K.;Bartke, J.;Bartsch, E.;BASILE, MAURIZIO;Bastid, N.;Basu, S.;Bathen, B.;Batigne, G.;Batista Camejo, A.;Batyunya, B.;Batzing, P. C.;Bearden, I. G.;Beck, H.;Bedda, C.;Behera, N. K.;Belikov, I.;BELLINI, FRANCESCA;Bello Martinez, H.;Bellwied, R.;Belmont Moreno, E.;Beltran, L. G. E.;Belyaev, V.;Bencedi, G.;Beole, S.;Berceanu, I.;Bercuci, A.;Berdnikov, Y.;Berenyi, D.;Bertens, R. A.;Berzano, D.;Betev, L.;Bhasin, A.;Bhat, I. R.;Bhati, A. K.;Bhattacharjee, B.;Bhom, J.;Bianchi, L.;Bianchi, N.;Bianchin, C.;Bielčík, J.;Bielčíková, J.;Bilandzic, A.;Biro, G.;Biswas, R.;Biswas, S.;Bjelogrlic, S.;Blair, J. T.;Blau, D.;Blume, C.;Bock, F.;Bogdanov, A.;Bøggild, H.;Boldizsár, L.;Bombara, M.;Bonora, M.;Book, J.;Borel, H.;Borissov, A.;Borri, M.;Bossú, F.;Botta, E.;Bourjau, C.;Braun Munzinger, P.;Bregant, M.;Broker, T. A.;Browning, T. A.;Broz, M.;Brucken, E. J.;Bruna, E.;Bruno, G. E.;Budnikov, D.;Buesching, H.;Bufalino, S.;Buhler, P.;Buitron, S. A. I.;Buncic, P.;Busch, O.;Buthelezi, Z.;Butt, J. B.;Buxton, J. T.;Cabala, J.;Caffarri, D.;Cai, X.;Caines, H.;Caliva, A.;Calvo Villar, E.;Camerini, P.;Carena, F.;Carena, W.;CARNESECCHI, FRANCESCA;Castillo Castellanos, J.;Castro, A. J.;Casula, E. A. R.;Ceballos Sanchez, C.;Cepila, J.;Cerello, P.;Cerkala, J.;Chang, B.;Chapeland, S.;Chartier, M.;Charvet, J. L.;Chattopadhyay, S.;Chattopadhyay, S.;Chauvin, A.;Chelnokov, V.;Cherney, M.;Cheshkov, C.;Cheynis, B.;Chibante Barroso, V.;Chinellato, D. D.;Cho, S.;Chochula, P.;Choi, K.;Chojnacki, M.;Choudhury, S.;Christakoglou, P.;Christensen, C. H.;Christiansen, P.;Chujo, T.;Chung, S. U.;Cicalo, C.;CIFARELLI, LUISA;Cindolo, F.;Cleymans, J.;Colamaria, F.;Colella, D.;Collu, A.;COLOCCI, MANUEL;Conesa Balbastre, G.;Conesa del Valle, Z.;Connors, M. E.;Contreras, J. G.;Cormier, T. M.;Corrales Morales, Y.;Cortés Maldonado, I.;Cortese, P.;Cosentino, M. R.;Costa, F.;Crkovská, J.;Crochet, P.;Cruz Albino, R.;Cuautle, E.;Cunqueiro, L.;Dahms, T.;Dainese, A.;Danisch, M. C.;Danu, A.;Das, D.;Das, I.;Das, S.;Dash, A.;Dash, S.;De, S.;De Caro, A.;de Cataldo, G.;de Conti, C.;de Cuveland, J.;De Falco, A.;De Gruttola, D.;De Marco, N.;De Pasquale, S.;De Souza, R. D.;Deisting, A.;Deloff, A.;Deplano, C.;Dhankher, P.;Di Bari, D.;Di Mauro, A.;Di Nezza, P.;Di Ruzza, B.;Diaz Corchero, M. A.;Dietel, T.;Dillenseger, P.;Divià, R.;Djuvsland, Ø.;Dobrin, A.;Domenicis Gimenez, D.;Dönigus, B.;Dordic, O.;Drozhzhova, T.;Dubey, A. K.;Dubla, A.;Ducroux, L.;Duggal, A. K.;Dupieux, P.;Ehlers, R. J.;Elia, D.;Endress, E.;Engel, H.;Epple, E.;Erazmus, B.;Erhardt, F.;Espagnon, B.;Estienne, M.;Esumi, S.;Eulisse, G.;Eum, J.;Evans, D.;Evdokimov, S.;Eyyubova, G.;Fabbietti, L.;Fabris, D.;Faivre, J.;Fantoni, A.;Fasel, M.;Feldkamp, L.;Feliciello, A.;Feofilov, G.;Ferencei, J.;Fernández Téllez, A.;Ferreiro, E. G.;Ferretti, A.;Festanti, A.;Feuillard, V. J. G.;Figiel, J.;Figueredo, M. A. S.;Filchagin, S.;Finogeev, D.;Fionda, F. M.;Fiore, E. M.;Floris, M.;Foertsch, S.;Foka, P.;Fokin, S.;Fragiacomo, E.;Francescon, A.;Francisco, A.;Frankenfeld, U.;Fronze, G. G.;Fuchs, U.;Furget, C.;Furs, A.;Fusco Girard, M.;Gaardhøje, J. J.;Gagliardi, M.;Gago, A. M.;Gajdosova, K.;Gallio, M.;Galvan, C. D.;Gangadharan, D. R.;Ganoti, P.;Gao, C.;Garabatos, C.;Garcia Solis, E.;Garg, K.;Garg, P.;Gargiulo, C.;Gasik, P.;Gauger, E. F.;Germain, M.;Gheata, M.;Ghosh, P.;Ghosh, S. K.;Gianotti, P.;Giubellino, P.;Giubilato, P.;Gladysz Dziadus, E.;Glässel, P.;Goméz Coral, D. M.;Gomez Ramirez, A.;Gonzalez, A. S.;Gonzalez, V.;González Zamora, P.;Gorbunov, S.;Görlich, L.;Gotovac, S.;Grabski, V.;Grachov, O. A.;Graczykowski, L. K.;Graham, K. L.;Grelli, A.;Grigoras, C.;Grigoriev, V.;Grigoryan, A.;Grigoryan, S.;Grinyov, B.;Grion, N.;Gronefeld, J. M.;Grosse Oetringhaus, J. F.;Grosso, R.;Gruber, L.;Guber, F.;Guernane, R.;GUERZONI, BARBARA;Gulbrandsen, K.;Gunji, T.;Gupta, A.;Gupta, R.;Guzman, I. B.;Haake, R.;Hadjidakis, C.;Haiduc, M.;Hamagaki, H.;Hamar, G.;Hamon, J. C.;Harris, J. W.;Harton, A.;Hatzifotiadou, D.;Hayashi, S.;Heckel, S. T.;Hellbär, E.;Helstrup, H.;Herghelegiu, A.;Herrera Corral, G.;Herrmann, F.;Hess, B. A.;Hetland, K. F.;Hillemanns, H.;Hippolyte, B.;Horak, D.;Hosokawa, R.;Hristov, P.;Hughes, C.;Humanic, T. J.;Hussain, N.;Hussain, T.;Hutter, D.;Hwang, D. S.;Ilkaev, R.;Inaba, M.;Incani, E.;Ippolitov, M.;Irfan, M.;Isakov, V.;Ivanov, M.;Ivanov, V.;Izucheev, V.;Jacak, B.;JACAZIO, NICOLÒ;Jacobs, P. M.;Jadhav, M. B.;Jadlovska, S.;Jadlovsky, J.;Jahnke, C.;Jakubowska, M. J.;Janik, M. A.;Jayarathna, P. H. S. Y.;Jena, C.;Jena, S.;Jimenez Bustamante, R. T.;Jones, P. G.;Jung, H.;Jusko, A.;Kalinak, P.;Kalweit, A.;Kang, J. H.;Kaplin, V.;Kar, S.;Karasu Uysal, A.;Karavichev, O.;Karavicheva, T.;Karayan, L.;Karpechev, E.;Kebschull, U.;Keidel, R.;Keijdener, D. L. D.;Keil, M.;Mohisin Khan, M.;Khan, P.;Khan, S. A.;Khanzadeev, A.;Kharlov, Y.;Khatun, A.;Khuntia, A.;Kileng, B.;Kim, D. W.;Kim, D. J.;Kim, D.;Kim, H.;Kim, J. S.;Kim, J.;Kim, M.;Kim, M.;Kim, S.;Kim, T.;Kirsch, S.;Kisel, I.;Kiselev, S.;Kisiel, A.;Kiss, G.;Klay, J. L.;Klein, C.;Klein, J.;Klein Bösing, C.;Klewin, S.;Kluge, A.;Knichel, M. L.;Knospe, A. G.;Kobdaj, C.;Kofarago, M.;Kollegger, T.;Kolojvari, A.;Kondratiev, V.;Kondratyeva, N.;Kondratyuk, E.;Konevskikh, A.;Kopcik, M.;Kour, M.;Kouzinopoulos, C.;Kovalenko, O.;Kovalenko, V.;Kowalski, M.;Koyithatta Meethaleveedu, G.;Králik, I.;Kravčáková, A.;Krivda, M.;Krizek, F.;Kryshen, E.;Krzewicki, M.;Kubera, A. M.;Kučera, V.;Kuhn, C.;Kuijer, P. G.;Kumar, A.;Kumar, J.;Kumar, L.;Kumar, S.;Kundu, S.;Kurashvili, P.;Kurepin, A.;Kurepin, A. B.;Kuryakin, A.;Kweon, M. J.;Kwon, Y.;La Pointe, S. L.;La Rocca, P.;Lagana Fernandes, C.;Lakomov, I.;Langoy, R.;Lapidus, K.;Lara, C.;Lardeux, A.;Lattuca, A.;Laudi, E.;Lazaridis, L.;Lea, R.;Leardini, L.;Lee, S.;Lehas, F.;Lehner, S.;Lehrbach, J.;Lemmon, R. C.;Lenti, V.;Leogrande, E.;León Monzón, I.;León Vargas, H.;Leoncino, M.;Lévai, P.;Li, S.;Li, X.;Lien, J.;Lietava, R.;Lindal, S.;Lindenstruth, V.;Lippmann, C.;Lisa, M. A.;Ljunggren, H. M.;Lodato, D. F.;Loenne, P. 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A.;Richert, T.;Richter, M.;Riedler, P.;Riegler, W.;Riggi, F.;Ristea, C.;Rodríguez Cahuantzi, M.;Røed, K.;Rogochaya, E.;Rohr, D.;Röhrich, D.;Ronchetti, F.;Ronflette, L.;Rosnet, P.;Rossi, A.;Roukoutakis, F.;Roy, A.;Roy, C.;Roy, P.;Rubio Montero, A. J.;Rui, R.;Russo, R.;Ryabinkin, E.;Ryabov, Y.;Rybicki, A.;Saarinen, S.;Sadhu, S.;Sadovsky, S.;Šafařík, K.;Sahlmuller, B.;Sahoo, P.;Sahoo, R.;Sahoo, S.;Sahu, P. K.;Saini, J.;Sakai, S.;Saleh, M. A.;Salzwedel, J.;Sambyal, S.;Samsonov, V.;Šándor, L.;Sandoval, A.;Sano, M.;Sarkar, D.;Sarkar, N.;Sarma, P.;Scapparone, E.;Scarlassara, F.;Schiaua, C.;Schicker, R.;Schmidt, C.;Schmidt, H. R.;Schmidt, M.;Schukraft, J.;Schutz, Y.;Schwarz, K.;Schweda, K.;SCIOLI, GILDA;Scomparin, E.;Scott, R.;Šefčík, M.;Seger, J. E.;Sekiguchi, Y.;Sekihata, D.;Selyuzhenkov, I.;Senosi, K.;Senyukov, S.;Serradilla, E.;Sevcenco, A.;Shabanov, A.;Shabetai, A.;Shadura, O.;Shahoyan, R.;Shangaraev, A.;Sharma, A.;Sharma, A.;Sharma, M.;Sharma, M.;Sharma, N.;Sheikh, A. 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S.;Windelband, B.;Winn, M.;Yalcin, S.;Yang, P.;Yano, S.;Yin, Z.;Yokoyama, H.;Yoo, I. K.;Yoon, J. H.;Yurchenko, V.;Zaccolo, V.;Zaman, A.;Zampolli, C.;Zanoli, H. J. C.;Zaporozhets, S.;Zardoshti, N.;Zarochentsev, A.;Závada, P.;Zaviyalov, N.;Zbroszczyk, H.;Zgura, I. S.;Zhalov, M.;Zhang, H.;Zhang, X.;Zhang, Y.;Zhang, C.;Zhang, Z.;Zhao, C.;Zhigareva, N.;Zhou, D.;Zhou, Y.;Zhou, Z.;Zhu, H.;Zhu, J.;Zhu, X.;Zichichi, A.;Zimmermann, A.;Zimmermann, M. B.;Zinovjev, G.;Zmeskal, J.
2016
Abstract
We present measurements of two-particle correlations with neutral pion trigger particles of transverse momenta 8>pTtrig>16 GeV/c and associated charged particles of 0.5>pTassoc>10 GeV/c versus the azimuthal angle difference Δφ at midrapidity in pp and central Pb–Pb collisions at sNN=2.76 TeV with ALICE. The new measurements exploit associated charged hadrons down to 0.5 GeV/c, which significantly extends our previous measurement that only used charged hadrons above 3 GeV/c. After subtracting the contributions of the flow background, v2 to v5, the per-trigger yields are extracted for |Δφ|>0.7 on the near and for |Δφ−π|>1.1 on the away side. The ratio of per-trigger yields in Pb–Pb to those in pp collisions, IAA, is measured on the near and away side for the 0–10% most central Pb–Pb collisions. On the away side, the per-trigger yields in Pb–Pb are strongly suppressed to the level of IAA≈0.6 for pTassoc<3 GeV/c, while with decreasing momenta an enhancement develops reaching about 5 at low pTassoc. On the near side, an enhancement of IAA between 1.2 at the highest to 1.8 at the lowest pTassoc is observed. The data are compared to parton-energy-loss predictions of the JEWEL and AMPT event generators, as well as to a perturbative QCD calculation with medium-modified fragmentation functions. All calculations qualitatively describe the away-side suppression at high pTassoc. Only AMPT captures the enhancement at low pTassoc, both on the near and away side. However, it also underpredicts IAA above 5 GeV/c, in particular on the near-side.
Adam, J., Adamová, D., Aggarwal, M., Aglieri Rinella, G., Agnello, M., Agrawal, N., et al. (2016). Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV. PHYSICS LETTERS. SECTION B, 763, 238-250 [10.1016/j.physletb.2016.10.048].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/596264
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