Measurement of Ds+ production and nuclear modification factor in Pb Pb collisions at sNN=2.76 TeV

Jaroslav Adam,Dagmar Adamová,Madan M. Aggarwal,Gianluca Aglieri Rinella,Michelangelo Agnello,Nikita Agrawal,Zubayer Ahammed, Sang Un Ahn,Salvatore Aiola,Alexander Akindinov,Johan Alme,Håvard Helstrup, Kristin Fanebust Hetland,Bjarte Kileng,Sedat Altinpinar,Øystein Djuvsland, Øystein Senneset Haaland,Meidana Huang,Per-Ivar Lønne,Joakim Nystrand,Attiq ur Rehman,Dieter Røhrich,Ganesh Jagannath Tambave,Kjetil Ullaland, Arild Velure, Boris Wagner,Hui Zhang,Zhuo Zhou,Hongsheng Zhu, Ionut Christian Arsene,Paul Christoph Bätzing, Olja Dordic,Svein Lindal, Sohail Musa Mahmood,Jovan Milosevic,Henrik Qvigstad,Matthias Richter,Ketil Røed, Toralf Bernhard Skaali, Trine Spedstad Tveter, Jon Christopher Wikne,Chengxin Zhao, Rune Langøy,Jørgen André Lien, Sk Noor Alam, Dimitry Aleksandrov, Bruno Alessandro, Didier Alexandre, José Rubén Alfaro Molina,Andrea Alici, F Barile,GG Barnaföldi,LS Barnby, Barret,P Bartalini, K Barth, J Bartke,E Bartsch, M Basile,N Bastid,S Basu,B Bathen,G Batigne, A Batista Camejo, B Batyunya,PC Batzing,IG Bearden,H Beck,C Bedda, NK Behera,I Belikov, F Bellini, H Bello Martinez,R Bellwied,R Belmont,E Belmont-Moreno, Belyaev,G Bencedi,S Beole, I Berceanu,A Bercuci,Y Berdnikov,D Berenyi,RA Bertens, D Berzano,L Betev,A Bhasin,IR Bhat, AK Bhati,B Bhattacharjee,J Bhom,L Bianchi,N Bianchi, C Bianchin, J Bielcik, J Bielcikova,A Bilandzic,R Biswas,S Biswas, S Bjelogrlic,JT Blair, D Blau, C Blume, F Bock,A Bogdanov,H Bøggild, L Boldizsar, M Bombara, J Book, H Borel, A Borissov, M Borri, F Bossu,E Botta, S Böttger, C Bourjau, P Braun-Munzinger, M Bregant, T Breitner,TA Broker,TA Browning, M Broz,EJ Brucken, E Bruna, GE Bruno, D Budnikov, H Buesching, S Bufalino, P Buncic, O Busch,Z Buthelezi,JB Butt,JT Buxton, D Caffarri,X Cai,H Caines, L Calero Diaz, A Caliva,E Calvo Villar, P Camerini,F Carena,W Carena,F Carnesecchi,J Castillo Castellanos,AJ Castro, Ear Casula,C Ceballos Sanchez, J Cepila,P Cerello, J Cerkala,B Chang, S Chapeland, M Chartier,JL Charvet,S Chattopadhyay, Chelnokov,M Cherney,C Cheshkov,B Cheynis, Chibante Barroso, DD Chinellato,S Cho, P Chochula,K Choi,M Chojnacki,S Choudhury,P Christakoglou,CH Christensen, P Christiansen,T Chujo,Su Chung, C Cicalo, L Cifarelli, F Cindolo,J Cleymans, F Colamaria,D Colella, A Collu,M Colocci,G Conesa Balbastre,Z Conesa del Valle,ME Connors, JG Contreras,TM Cormier,Y Corrales Morales,I Cortes Maldonado,P Cortese, Cosentino,F Costa,P Crochet, R Cruz Albino, E Cuautle, L Cunqueiro, T Dahms, A Dainese, A Danu, D Das,I Das,S Das,A Dash,S Dash,S De,A De Caro,G de Cataldo, C de Conti,J de Cuveland,A De Falco,D De Gruttola,N De Marco,S De Pasquale,A Deisting, A Deloff, E Denes, C Deplano, P Dhankher,D Di Bari,A Di Mauro,P Di Nezza, MA Diaz Corchero, T Dietel,P Dillenseger, R Divia, Ø Djuvsland,A Dobrin,D Domenicis Gimenez, B Dönigus,O Dordic,T Drozhzhova,AK Dubey, A Dubla,L Ducroux,P Dupieux, RJ Ehlers,D Elia,H Engel, E Epple,B Erazmus, I Erdemir, F Erhardt, B Espagnon, M Estienne, S Esumi, J Eum,D Evans,S Evdokimov, G Eyyubova,L Fabbietti,D Fabris, J Faivre,A Fantoni, M Fasel,L Feldkamp, A Feliciello,G Feofilov, J Ferencei,A Fernandez Tellez,EG Ferreiro, A Ferretti,A Festanti,Vjg Feuillard,J Figiel, Mas Figueredo, S Filchagin, D Finogeev, FM Fionda,EM Fiore,MG Fleck, M Floris, S Foertsch, P Foka,S Fokin, E Fragiacomo, A Francescon, U Frankenfeld, U Fuchs, C Furget,A Furs,M Fusco Girard,JJ Gaardhøje, M Gagliardi,AM Gago,M Gallio, Gangadharan,P Ganoti,C Gao, C Garabatos,E Garcia-Solis,C Gargiulo,P Gasik,EF Gauger,M Germain, A Gheata, M Gheata,P Ghosh,SK Ghosh, P Gianotti, P Giubellino, P Giubilato,E Gladysz-Dziadus, P Glässel, DM Gomez Coral,A Gomez Ramirez, Gonzalez, P Gonzalez-Zamora,S Gorbunov, L Görlich,S Gotovac, Grabski,OA Grachov,LK Graczykowski,KL Graham, A Grelli, A Grigoras, C Grigoras, Grigoriev,A Grigoryan,S Grigoryan,B Grinyov, N Grion,JM Gronefeld,JF Grosse-Oetringhaus,JY Grossiord, R Grosso, F Guber, R Guernane, B Guerzoni,K Gulbrandsen,T Gunji,A Gupta,R Gupta, R Haake, Ø Haaland, C Hadjidakis, M Haiduc,H Hamagaki,G Hamar,JW Harris,A Harton,D Hatzifotiadou,S Hayashi, ST Heckel, M Heide,H Helstrup, A Herghelegiu,G Herrera Corral,BA Hess, KF Hetland,H Hillemanns, B Hippolyte,R Hosokawa,P Hristov,M Huang,TJ Humanic,N Hussain,T Hussain,D Hutter,DS Hwang, R Ilkaev, M Inaba,GM Innocenti, M Ippolitov,M Irfan,M Ivanov, Ivanov, Izucheev,PM Jacobs,MB Jadhav,S Jadlovska,J Jadlovsky, C Jahnke,MJ Jakubowska,HJ Jang, MA Janik,Phsy Jayarathna,C Jena,S Jena, RT Jimenez Bustamante,PG Jones,H Jung, A Jusko, P Kalinak, A Kalweit,J Kamin,JH Kang, Kaplin,S Kar,A Karasu Uysal, O Karavichev, T Karavicheva,L Karayan, E Karpechev, U Kebschull,R Keidel,Dld Keijdener,M Keil, M Mohisin Khan,P Khan,SA Khan, A Khanzadeev,Y Kharlov, B Kileng,DW Kim,DJ Kim,D Kim,H Kim,JS Kim,M Kim, S Kim,T Kim,S Kirsch,I Kisel, S Kiselev,A Kisiel,G Kiss,JL Klay,C Klein,J Klein,C Klein-Bösing,S Klewin,A Kluge, ML Knichel, AG Knospe,T Kobayashi,C Kobdaj, M Kofarago, T Kollegger, A Kolojvari, N Kondratyeva,E Kondratyuk, A Konevskikh, M Kopcik, M Kour,C Kouzinopoulos,O Kovalenko, Kovalenko,M Kowalski,G Koyithatta Meethaleveedu, I Kralik, A Kravcakova,M Kretz,M Krivda, F Krizek,E Kryshen, M Krzewicki,AM Kubera, Kucera,C Kuhn,PG Kuijer,A Kumar,J Kumar,L Kumar,S Kumar, P Kurashvili,A Kurepin,AB Kurepin, A Kuryakin,MJ Kweon, Y Kwon, SL La Pointe,P La Rocca,P Ladron de Guevara, C Lagana Fernandes,I Lakomov, R Langoy,C Lara,A Lardeux,A Lattuca, E Laudi,R Lea, L Leardini,GR Lee,S Lee, F Lehas,RC Lemmon, Lenti,E Leogrande,I Leon Monzon,H Leon Vargas, M Leoncino,P Levai,S Li,X Li,J Lien,R Lietava,S Lindal

user-5ebe28934c775eda72abcddd（2016）

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摘要

Author(s): The ALICE collaboration; Adam, J; Adamova, D; Aggarwal, MM; Aglieri Rinella, G; Agnello, M; Agrawal, N; Ahammed, Z; Ahn, SU; Aiola, S; Akindinov, A; Alam, SN; Aleksandrov, D; Alessandro, B; Alexandre, D; Alfaro Molina, R; Alici, A; Alkin, A; Almaraz, JRM; Alme, J; Alt, T; Altinpinar, S; Altsybeev, I; Alves Garcia Prado, C; Andrei, C; Andronic, A; Anguelov, V; Anielski, J; Anticic, T; Antinori, F; Antonioli, P; Aphecetche, L; Appelshauser, H; Arcelli, S; Arnaldi, R; Arnold, OW; Arsene, IC; Arslandok, M; Audurier, B; Augustinus, A; Averbeck, R; Azmi, MD; Badala, A; Baek, YW; Bagnasco, S; Bailhache, R; Bala, R; Baldisseri, A; Baral, RC; Barbano, AM; Barbera, R; Barile, F; Barnafoldi, GG; Barnby, LS; Barret, V; Bartalini, P; Barth, K; Bartke, J; Bartsch, E; Basile, M; Bastid, N; Basu, S; Bathen, B; Batigne, G; Batista Camejo, A; Batyunya, B; Batzing, PC; Bearden, IG; Beck, H; Bedda, C; Behera, NK; Belikov, I; Bellini, F; Bello Martinez, H; Bellwied, R; Belmont, R; Belmont-Moreno, E; Belyaev, V; Bencedi, G; Beole, S; Berceanu, I; Bercuci, A; Berdnikov, Y; Berenyi, D; Bertens, RA | Abstract: © 2016, The Author(s). The production of prompt Ds+ mesons was measured for the first time in collisions of heavy nuclei with the ALICE detector at the LHC. The analysis was performed on a data sample of Pb-Pb collisions at a centre-of-mass energy per nucleon pair, (Formula presented.) , of 2.76 TeV in two different centrality classes, namely 0–10% and 20–50%. Ds+ mesons and their antiparticles were reconstructed at mid-rapidity from their hadronic decay channel Ds+ → ϕπ+, with ϕ → K−K+, in the transverse momentum intervals 4 l pT l 12GeV/c and 6 l pT l 12 GeV/c for the 0–10% and 20–50% centrality classes, respectively. The nuclear modification factor RAA was computed by comparing the pT-differential production yields in Pb-Pb collisions to those in proton-proton (pp) collisions at the same energy. This pp reference was obtained using the cross section measured at (Formula presented.) TeV and scaled to (Formula presented.) TeV. The RAA of Ds+ mesons was compared to that of non-strange D mesons in the 10% most central Pb-Pb collisions. At high pT (8 l pT l 12 GeV/c) a suppression of the Ds+-meson yield by a factor of about three, compatible within uncertainties with that of non-strange D mesons, is observed. At lower pT (4 l pT l 8 GeV/c) the values of the Ds+-meson RAA are larger than those of non-strange D mesons, although compatible within uncertainties. The production ratios Ds+/D0 and Ds+/D+ were also measured in Pb-Pb collisions and compared to their values in proton-proton collisions.

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Transverse momentum,Physics,Particle physics,Nucleon,Nuclear physics,Modification factor,Meson,Hadronic decay,Antiparticle

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