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Enhanced production of multi-strange hadrons in high-multiplicity proton-proton collisions
Authors
J. Adam Adamov, 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, A. Alkin, A. Alme, J. Alt, T. Altinpinar, S. Altsybeev, I. Prado, C.A.G. An, M. Andrei, C. Andrews, H.A. Andronic, A. Anguelov, V. Anticic, T. Antinori, F. Antonioli, P. Aphecetche, L. Appelshäuser, H. Arcelli, S. 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. Barnafldi, G.G. Barnby, L.S. Barret, V. Bartalini, P. Barth, K. Bartke, J. Bartsch, E. Basile, M. Bastid, N. Basu, S. Bathen, B. Batigne, G. Camejo, A.B. Batyunya, B. Batzing, P.C. Bearden, I.G. Beck, H. Bedda, C. Behera, N.K. Belikov, I. Bellini, F. Martinez, H.B. Bellwied, R. Belmont, 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. Bielcík, J. Bielcíková, 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. Breitner, T. Broker, T.A. Browning, T.A. Broz, M. Brucken, E.J. Bruna, E. Bruno, G.E. Budnikov, D. Buesching, H. Bufalino, S. Buncic, P. Busch, O. Buthelezi, Z. Butt, J.B. Buxton, J.T. Cabala, J. Caarri, D. Cai, X. Caines, H. Diaz, L.C. Caliva, A. Villar, E.C. Camerini, P. Carena, F. Carena, W. Carnesecchi, F. Castellanos, J.C. Castro, A.J. Casula, E.A.R. Sanchez, C.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. Barroso, V.C. 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, L. Cindolo, F. Cleymans, J. Colamaria, F. Colella, D. Collu, A. Colocci, M. Balbastre, G.C. Del Valle, C.Z. Connors, M.E. Contreras, J.G. Cormier, T.M. Morales, Y.C. Maldonado, I.C. Cortese, P. Cosentino, M.R. Costa, F. Crkovska, J. Crochet, P. Albino, R.C. 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. Delo, A. Dénes, E. Deplano, C. Dhankher, P. Di Bari, D. Di Mauro, A. Di Nezza, P. Di Ruzza, B. Corchero, M.A.D. Dietel, T. Dillenseger, P. Divià, R. Djuvsland, O. Dobrin, A. Gimenez, D.D. Dönigus, B. Dordic, O. Drozhzhova, T. Dubey, A.K. Dubla, A. Ducroux, L. Dupieux, P. Ehlers, R.J. Elia, D. Endress, E. Engel, H. Epple, E. Erazmus, B. Erdemir, I. Erhardt, F. Espagnon, B. Estienne, M. Esumi, S. 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. Téllez, A.F. 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. Girard, M.F. 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. 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. Coral, D.M.G. Ramirez, A.G. 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, 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, B. Gulbrandsen, K. Gunji, T. Gupta, A. Gupta, R. 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. Corral, G.H. 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, N. 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. Bustamante, R.T.J. Jones, P.G. Jusko, A. Kalinak, P. Kalweit, A. Kang, J.H. Kaplin, V. Kar, S. Uysal, A.K. Karavichev, O. Karavicheva, T. Karayan, L. Karpechev, E. Kebschull, U. Keidel, R. Keijdener, D.L.D. Keil, M. Khan, M.M. Khan, P. Khan, S.A. Khanzadeev, A. Kharlov, Y. Khatun, A. Kileng, B. Kim, D.W. Kim, D.J. Kim, D. Kim, H. Kim, J.S. Kim, J. 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. Meethaleveedu, G.K. Králik, I. Kravcáková, A. Krivda, M. Krizek, F. Kryshen, E. Krzewicki, M. Kubera, A.M. Kucera, V. Kuhn, C. Kuijer, P.G. Kumar, A. Kumar, J. Kumar, L. Kumar, S. Kurashvili, P. Kurepin, A. Kurepin, A.B. Kuryakin, A. Kweon, M.J. Kwon, Y. La Pointe, S.L. La Rocca, P. De Guevara, L.P. Fernandes, C.L. Lakomov, I. Langoy, R. Lapidus, K. Lara, C. Lardeux, A. Lattuca, A. Laudi, E. Lea, R. Leardini, L. Lee, S. Lehas, F. Lehner, S. Lemmon, R.C. Lenti, V. Leogrande, E. Monzón, I.L. Vargas, H.L. 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.I. Loginov, V. Loizides, C. Lopez, X. Torres, E.L. Lowe, A. Luettig, P. Lunardon, M. Luparello, G. Lupi, M. Lutz, T.H. Maevskaya, A. Mager, M. Mahajan, S. Mahmood, S.M. Maire, A. Majka, R.D. Malaev, M. Cervantes, I.M. Malinina, L. Mal&apos
Publication date
1 January 2017
Publisher
Abstract
At sufficiently high temperature and energy density, nuclear matter undergoes a transition to a phase in which quarks and gluons are not confined: the quark-gluon plasma (QGP). Such an exotic state of strongly interacting quantum chromodynamics matter is produced in the laboratory in heavy nuclei high-energy collisions, where an enhanced production of strange hadrons is observed. Strangeness enhancement, originally proposed as a signature of QGP formation in nuclear collisions, is more pronounced for multi-strange baryons. Several effects typical of heavy-ion phenomenology have been observed in high-multiplicity proton-proton (pp) collisions, but the enhanced production of multi-strange particles has not been reported so far. Here we present the first observation of strangeness enhancement in high-multiplicity proton-proton collisions. We find that the integrated yields of strange and multi-strange particles, relative to pions, increases significantly with the event charged-particle multiplicity. The measurements are in remarkable agreement with the p-Pb collision results, indicating that the phenomenon is related to the final system created in the collision. In high-multiplicity events strangeness production reaches values similar to those observed in Pb-Pb collisions, where a QGP is formed. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved
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