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Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F et al (show 834 more authors) , Alexander, M, Albero, A Alfonso, Alkhazov, G, Cartelle, P Alvarez, Alves, AA Jr, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barrand, GC, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Batozskaya, V, Batsukh, B, Battig, A, Battista, V, Bay, A, Beddow, J, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belin, S, Beliy, N, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, van Beuzekom, M, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bifani, S, 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Coco, V, Coelho, JAB, Cogan, J, Cogneras, E, Cojocariu, L, Collins, P, Colombo, T, Comerma-Montells, A, Contu, A, Coombs, G, Coquereau, S, Corti, G, Corvo, M, Sobral, CM Costa, Couturier, B, Cowan, GA, Craik, DC, Crocombe, A, Cruz Torres, M, Currie, R, D'Ambrosio, C, Da Cunha Marinho, F, Da Silva, CL, Dall'Occo, E, Dalseno, J, Danilina, A, Davis, A, Francisco, O De Aguiar, De Bruyn, K, De Capua, S, De Cian, M, De Miranda, JM, De Paula, L, De Serio, M, De Simone, P, Dean, CT, Decamp, D, Del Buono, L, Delaney, B, Dembinski, H-P, Demmer, M, Dendek, A, Derkach, D, Deschamps, O, Desse, F, Dettori, F, Dey, B, Di Canto, A, Di Nezza, P, Didenko, S, Dijkstra, H, Dordei, F, Dorigo, M, Dosil Suarez, A, Douglas, L, Dovbnya, A, Dreimanis, K, Dufour, L, Dujany, G, Durante, P, Durham, JM, Dutta, D, Dzhelyadin, R, Dziewiecki, M, Dziurda, A, Dzyuba, A, Easo, S, Egede, U, Egorychev, V, Eidelman, S, Eisenhardt, S, Eitschberger, U, Ekelhof, R, Eklund, L, Ely, S, Ene, A, Escher, S, Esen, S, Evans, T, 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(2020)
Observation of structure in the <i>J</i>/ψ-pair mass spectrum.
SCIENCE BULLETIN, 65 (23).
pp. 1983-1993.
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Open Access link.
Abstract
Using proton-proton collision data at centre-of-mass energies of s=7,8 and 13TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9fb<sup>-1</sup>, the invariant mass spectrum of J/ψ pairs is studied. A narrow structure around 6.9GeV/c<sup>2</sup> matching the lineshape of a resonance and a broad structure just above twice the J/ψ mass are observed. The deviation of the data from nonresonant J/ψ-pair production is above five standard deviations in the mass region between 6.2 and 7.4GeV/c<sup>2</sup>, covering predicted masses of states composed of four charm quarks. The mass and natural width of the narrow X(6900) structure are measured assuming a Breit-Wigner lineshape.
Item Type: |
Article
|
Additional Information: |
All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-011.html (LHCb
public pages) |
Uncontrolled Keywords: |
QCD, Exotics, Tetraquark, Spectroscopy, Quarkonium, Particle and resonance production |
Divisions: |
Faculty of Science and Engineering > School of Physical Sciences |
Depositing User: |
Symplectic Admin
|
Date Deposited: |
21 Apr 2021 10:26 |
Last Modified: |
17 Oct 2023 06:05 |
DOI: |
10.1016/j.scib.2020.08.032 |
Open Access URL: |
https://www.sciencedirect.com/science/article/pii/... |
Related URLs: |
|
URI: |
https://livrepository.liverpool.ac.uk/id/eprint/3120048 |