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First measurements of N-subjettiness in central Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}} \) = 2.76 TeV
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  • Regular Article - Experimental Physics
  • Open Access
  • Published: 01 October 2021

First measurements of N-subjettiness in central Pb-Pb collisions at \( \sqrt{s_{\mathrm{NN}}} \) = 2.76 TeV

  • The ALICE collaboration,
  • S. Acharya143,
  • D. Adamová98,
  • A. Adler76,
  • J. Adolfsson83,
  • G. Aglieri Rinella35,
  • M. Agnello31,
  • N. Agrawal55,
  • Z. Ahammed143,
  • S. Ahmad16,
  • S. U. Ahn78,
  • I. Ahuja39,
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  • D. Aleksandrov91,
  • B. Alessandro61,
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  • A. Alkin35,
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Journal of High Energy Physics volume 2021, Article number: 3 (2021) Cite this article

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A preprint version of the article is available at arXiv.

Abstract

The ALICE Collaboration reports the first fully-corrected measurements of the N-subjettiness observable for track-based jets in heavy-ion collisions. This study is performed using data recorded in pp and Pb-Pb collisions at centre-of-mass energies of \( \sqrt{s} \) = 7 TeV and \( \sqrt{s_{\mathrm{NN}}} \) = 2.76 TeV, respectively. In particular the ratio of 2-subjettiness to 1-subjettiness, τ2/τ1, which is sensitive to the rate of two-pronged jet substructure, is presented. Energy loss of jets traversing the strongly interacting medium in heavy-ion collisions is expected to change the rate of two-pronged substructure relative to vacuum. The results are presented for jets with a resolution parameter of R = 0.4 and charged jet transverse momentum of 40 ≤ pT,jet ≤ 60 GeV/c, which constitute a larger jet resolution and lower jet transverse momentum interval than previous measurements in heavy-ion collisions. This has been achieved by utilising a semi-inclusive hadron-jet coincidence technique to suppress the larger jet combinatorial background in this kinematic region. No significant modification of the τ2/τ1 observable for track-based jets in Pb-Pb collisions is observed relative to vacuum PYTHIA6 and PYTHIA8 references at the same collision energy. The measurements of τ2/τ1, together with the splitting aperture angle ∆R, are also performed in pp collisions at \( \sqrt{s} \) = 7 TeV for inclusive jets. These results are compared with PYTHIA calculations at \( \sqrt{s} \) = 7 TeV, in order to validate the model as a vacuum reference for the Pb-Pb centre-of-mass energy. The PYTHIA references for τ2/τ1 are shifted to larger values compared to the measurement in pp collisions. This hints at a reduction in the rate of two-pronged jets in Pb-Pb collisions compared to pp collisions.

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Author information

Authors and Affiliations

  1. A.I. Alikhanyan National Science Laboratory (Yerevan Physics Institute) Foundation, Yerevan, Armenia

    A. Grigoryan & S. Grigoryan

  2. AGH University of Science and Technology, Cracow, Poland

    B. Balis, M. Gorgon, A. Horzyk, M. Jablonski, J. P. Kitowski, P. J. Konopka, S. D. Koryciak & P. G. Russek

  3. Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, Kiev, Ukraine

    G. Tersimonov, V. Trubnikov & G. Zinovjev

  4. Bose Institute, Department of Physics and Centre for Astroparticle Physics and Space Science (CAPSS), Kolkata, India

    D. Banerjee, M. A. Bhat, S. Biswas, P. Das, S. Das, S. K. Ghosh, A. Modak & S. K. Prasad

  5. Budker Institute for Nuclear Physics, Novosibirsk, Russia

    Y. Pestov

  6. California Polytechnic State University, San Luis Obispo, California, United States

    J. L. Klay

  7. Central China Normal University, Wuhan, China

    H. M. Alfanda, M. N. Anaam, M. Cai, P. Cui, W. Deng, Y. Ding, F. Fan, M. Hamid, S. Kar, A. M. Khan, X. L. Li, Y. Mao, H. Pei, X. Peng, S. Tang, R. Xu, Z. Yin, X. Zhang, D. Zhou, J. Zhu & Y. Zhu

  8. Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear (CEADEN), Havana, Cuba

    R. A. Diaz, E. López Torres & G. M. Perez

  9. Centro de Investigación y de Estudios Avanzados (CINVESTAV), Mexico City and Mérida, Mexico

    G. Herrera Corral

  10. Chicago State University, Chicago, Illinois, United States

    E. Garcia-Solis & A. Harton

  11. China Institute of Atomic Energy, Beijing, China

    X. Li & Y. Zhi

  12. Chungbuk National University, Cheongju, Republic of Korea

    S. Noh

  13. Comenius University Bratislava, Faculty of Mathematics, Physics and Informatics, Bratislava, Slovakia

    N. Dzalaiova, M. Meres, M. Pikna, B. Sitar, A. Szabo & I. Szarka

  14. COMSATS University Islamabad, Islamabad, Pakistan

    Y. Ali, J. B. Butt, H. Ilyas, M. U. Naru, U. Tabassam & A. Zaman

  15. Creighton University, Omaha, Nebraska, United States

    R. Hosokawa & J. E. Seger

  16. Department of Physics, Aligarh Muslim University, Aligarh, India

    S. Ahmad, B. Ali, C. Anuj, M. D. Azmi, S. Khan, A. Khatun & M. Mohisin Khan

  17. Department of Physics, Pusan National University, Pusan, Republic of Korea

    B. Kim, B. Lim, S. H. Lim & I.-K. Yoo

  18. Department of Physics, Sejong University, Seoul, Republic of Korea

    S. Kim

  19. Department of Physics, University of California, Berkeley, California, United States

    P. Dhankher, D. U. Dixit, E. D. Lesser, A. Liu & F. Torales-Acosta

  20. Department of Physics, University of Oslo, Oslo, Norway

    I. C. Arsene, O. Dordic, Q. W. Malik, A. Neagu, M. Richter, K. Røed, T. B. Skaali, I. Storehaug, T. S. Tveter & J. Wikne

  21. Department of Physics and Technology, University of Bergen, Bergen, Norway

    J. Alme, L. Altenkamper, Ø. Djuvsland, V. N. Eikeland, M. R. Ersdal, F. M. Fionda, O. S. Groettvik, I. M. Lofnes, J. Nystrand, A. Rehman, D. Röhrich, J. Saetre, G. J. Tambave, K. Ullaland, B. Wagner, S. Yang & S. Yuan

  22. Dipartimento di Fisica dell’Università ‘La Sapienza’ and Sezione INFN, Rome, Italy

    F. Meddi

  23. Dipartimento di Fisica dell’Università and Sezione INFN, Cagliari, Italy

    P. Bhattacharya, S. Boi, E. A. R. Casula, A. Chauvin, A. De Falco, A. Mulliri, B. Paul & G. L. Usai

  24. Dipartimento di Fisica dell’Università and Sezione INFN, Trieste, Italy

    P. Camerini, G. Contin, C. De Martin, R. Lea, G. V. Margagliotti, R. Rui & V. Zaccolo

  25. Dipartimento di Fisica dell’Università and Sezione INFN, Turin, Italy

    L. Barioglio, S. Beole, L. Bianchi, E. Botta, L. De Cilladi, S. Delsanto, A. Ferretti, M. Gagliardi, M. Masera, F. Mazzaschi, L. Micheletti, L. Quaglia, L. Terlizzi & E. Vercellin

  26. Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Bologna, Italy

    A. Alici, S. Arcelli, F. Bellini, F. Carnesecchi, L. Cifarelli, M. Colocci, F. Ercolessi, M. Giacalone, N. Rubini, G. Scioli & A. Zichichi

  27. Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Catania, Italy

    R. Barbera, P. La Rocca, C. Pinto & F. Riggi

  28. Dipartimento di Fisica e Astronomia dell’Università and Sezione INFN, Padova, Italy

    F. Baruffaldi, M. Cai, M. Faggin, P. Giubilato, M. Lunardon, F. Soramel & S. Trogolo

  29. Dipartimento di Fisica e Nucleare e Teorica, Università di Pavia, Pavia, Italy

    G. Boca, S. Costanza, A. Rotondi & N. Valle

  30. Dipartimento di Fisica ‘E.R. Caianiello’ dell’Università and Gruppo Collegato INFN, Salerno, Italy

    A. De Caro, D. De Gruttola, S. De Pasquale, L. Dello Stritto, N. Funicello, E. Meninno & T. Virgili

  31. Dipartimento DISAT del Politecnico and Sezione INFN, Turin, Italy

    M. Agnello, A. Balbino, S. Bufalino, F. Catalano, P. Fecchio & S. Politano

  32. Dipartimento di Scienze e Innovazione Tecnologica dell’Università del Piemonte Orientale and INFN Sezione di Torino, Alessandria, Italy

    P. Cortese, L. Ramello & M. Sitta

  33. Dipartimento di Scienze MIFT, Università di Messina, Messina, Italy

    G. Mandaglio, A. Rosano & A. Trifiró

  34. Dipartimento Interateneo di Fisica ‘M. Merlin’ and Sezione INFN, Bari, Italy

    G. E. Bruno, D. Colella, D. Di Bari, A. G. T. Ramos, G. Trombetta & G. Volpe

  35. European Organization for Nuclear Research (CERN), Geneva, Switzerland

    G. Aglieri Rinella, A. Alkin, M. Angeletti, A. Augustinus, K. Barth, F. Bellini, L. Betev, P. M. Bond, F. Carnesecchi, S. Chapeland, V. Chibante Barroso, P. Chochula, M. Colocci, F. Costa, A. Di Mauro, R. Divià, G. Eulisse, G. Fiorenza, U. Fuchs, C. Gargiulo, C. Grigoras, F. Grosa, J. F. Grosse-Oetringhaus, J. A. Hasenbichler, H. Hillemanns, P. Hristov, J. P. Iddon, G. M. Innocenti, N. Jacazio, J. M. Jowett, A. Junique, A. Kalweit, M. Keil, J. Klein, A. Kluge, P. J. Konopka, V. Kučera, S. Kundu, M. Lamanna, K. Lapidus, E. Laudi, L. Lautner, M. Lettrich, M. Mager, P. Martinengo, A. L. Mazuecos, M. Mazzilli, A. Morsch, T. Mrnjavac, L. Musa, R. N. Patra, O. Pinazza, M. Puccio, F. Reidt, W. Riegler, D. Rohr, J. Schukraft, R. Shahoyan, G. Simonetti, M. Suljic, A. Tauro, A. Telesca, S. Trogolo, P. Vande Vyvre, B. Volkel, B. von Haller, A. Wegrzynek, S. C. Wenzel, C. Zampolli & N. Zardoshti

  36. Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Split, Croatia

    S. Gotovac, P. Loncar, E. Mudnic & L. Vickovic

  37. Faculty of Engineering and Science, Western Norway University of Applied Sciences, Bergen, Norway

    H. Helstrup, K. F. Hetland, B. Kileng, S. V. Nesbo, H. A. Reme-ness & M. M. Storetvedt

  38. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic

    J. Bielčík, M. Broz, J. G. Contreras, T. Herman, D. Horak, A. Isakov, K. Krizkova Gajdosova, R. Lavicka, V. Petráček, K. Šafařík, S. R. Torres & B. A. Trzeciak

  39. Faculty of Science, P.J. Šafárik University, Košice, Slovakia

    I. Ahuja, M. Bombara, A. Kravčáková, Z. Rescakova, M. Vala & J. Vrláková

  40. Frankfurt Institute for Advanced Studies, Johann Wolfgang Goethe-Universität Frankfurt, Frankfurt, Germany

    J. de Cuveland, S. Gorbunov, D. Hutter, I. Kisel, M. Krzewicki, S. L. La Pointe, J. Lehrbach, V. Lindenstruth, G. Neskovic & A. R. Redelbach

  41. Fudan University, Shanghai, China

    S. N. Alam, Y. G. Ma, Q. Shou, C. Wang, D. Wang, W. Wu & S. Zhang

  42. Gangneung-Wonju National University, Gangneung, Republic of Korea

    Y. W. Baek & J. S. Kim

  43. Gauhati University, Department of Physics, Guwahati, India

    B. Bhattacharjee & P. Sarma

  44. Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany

    M. Ball, P. Hauer, B. Ketzer & T. Mahmoud

  45. Helsinki Institute of Physics (HIP), Helsinki, Finland

    S. S. Räsänen, O. A. M. Saarimaki & M. Slupecki

  46. High Energy Physics Group, Universidad Autónoma de Puebla, Puebla, Mexico

    R. S. Camacho, T. G. Chavez, A. Fernández Téllez, J. R. A. Garcia, I. B. Guzman, S. P. Guzman, E. G. Hernandez, M. I. Martínez, L. A. P. Moreno, S. A. R. Ramirez, M. Rodríguez Cahuantzi, P. F. Rojas, G. Tejeda Muñoz, A. Vargas & S. Vergara Limón

  47. Hiroshima University, Hiroshima, Japan

    T. Osako, K. Shigaki, T. Sugitate, Y. Yamaguchi, K. Yamakawa & S. Yano

  48. Hochschule Worms, Zentrum für Technologietransfer und Telekommunikation (ZTT), Worms, Germany

    R. Keidel

  49. Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania

    C. Andrei, A. Bercuci, A. Lindner, M. Petrovici, A. Pop, C. Schiaua & M. G. Tarzila

  50. Indian Institute of Technology Bombay (IIT), Mumbai, India

    D. Bauri, P. Chakraborty, S. Dash, B. Naik, B. K. Nandi, S. Padhan, S. Roy, B. Sahoo, P. Sahoo & T. Tripathy

  51. Indian Institute of Technology Indore, Indore, India

    Y. Bailung, S. Deb, N. Mallick, R. Rath, S. P. Rode, A. Roy, R. Sahoo, D. Sahu & R. Singh

  52. Indonesian Institute of Sciences, Jakarta, Indonesia

    Z. Akbar & S. Sumowidagdo

  53. INFN, Laboratori Nazionali di Frascati, Frascati, Italy

    N. Bianchi, A. Fantoni, P. Gianotti, P. Larionov, V. Muccifora, S. Pisano, F. Ronchetti & M. Toppi

  54. INFN, Sezione di Bari, Bari, Italy

    F. Colamaria, D. Colella, G. de Cataldo, D. Elia, V. Manzari, A. Mastroserio, E. Nappi, A. Palasciano & G. Vino

  55. INFN, Sezione di Bologna, Bologna, Italy

    N. Agrawal, P. Antonioli, F. Cindolo, G. Clai, D. Hatzifotiadou, A. Margotti, R. Nania, F. Noferini, O. Pinazza, R. Preghenella & S. Tripathy

  56. INFN, Sezione di Cagliari, Cagliari, Italy

    C. Cicalo, F. M. Fionda, A. Masoni & S. Siddhanta

  57. INFN, Sezione di Catania, Catania, Italy

    A. Badalà, G. Mandaglio, A. Rosano & A. Trifiró

  58. INFN, Sezione di Padova, Padova, Italy

    F. Antinori, A. Dainese, A. Rossi & R. Turrisi

  59. INFN, Sezione di Pavia, Pavia, Italy

    G. Boca, G. Bonomi, S. Costanza, R. Lea, D. Pagano, J. Pazzini, A. Rotondi, M. Urioni, N. Valle & N. Zurlo

  60. INFN, Sezione di Roma, Rome, Italy

    M. A. Mazzoni

  61. INFN, Sezione di Torino, Turin, Italy