Observation of a Narrow Pentaquark State, P c ( 4312 ) + , and of the Two-Peak Structure of the P c ( 4450 ) +
- R. Aaij
- C. Abellán Beteta
- B. Adeva
- M. Adinolfi
- C. Aidala
- Z. Ajaltouni
- S. Akar
- P. Albicocco
- J. Albrecht
- F. Alessio
- Michael Thomas Alexander
- A. Alfonso Albero
- G. Alkhazov
- P. Álvarez Cartelle
- Antonio Augusto Alves Junior
- S. Amato
- Y. Amhis
- L. An
- L. Anderlini
- G. Andreassi
- M. Andreotti
- J. E. Andrews
- F. Archilli
- P. d’Argent
- J. Arnau Romeu
- A. Artamonov
- M. Artuso
- Kenenbek Arzymatov
- E. Aslanides
- M. Atzeni
- B. Audurier
- S. Bachmann
- John J Back
- S. Baker
- V. Balagura
- W. Baldini
- A. Baranov
- Roger John Barlow
- S. Barsuk
- W Barter
- M. Bartolini
- F. Baryshnikov
- V. Batozskaya
- B. Batsukh
- A. Battig
- V. Battista
- A. Bay
- F. Bedeschi
- I. Bediaga
- A. Beiter
- L. J. Bel
- V. Belavin
- S. Belin
- N. Beliy
- V. Bellée
- N. Belloli
- K. Belous
- I. Belyaev
- E. Ben-Haim
- G. Bencivenni
- S. Benson
- S. Beranek
- A. Berezhnoy
- R. Bernet
- D. Berninghoff
- E. Bertholet
- A. Bertolin
- C. Betancourt
- F. Betti
- M.-O. Bettler
- M. van Beuzekom
- Ia. Bezshyiko
- S. Bhasin
- J. Bhom
- M. S. Bieker
- S. Bifani
- P. Billoir
- A. Birnkraut
- A. Bizzeti
- M. Bjørn
- Michele Piero Blago
- T. Blake
- F. Blanc
- S. Blusk
- D. Bobulska
- V. Bocci
- O. Boente García
- T. Boettcher
- A. Bondar
- N. Bondar
- Sara Borghi
- M. Borisyak
- M. Borsato
- M. Boubdir
- T. J. V. Bowcock
- C. Bozzi
- S. Braun
- A. Brea Rodríguez
- M. Brodski
- J. Brodzicka
- MWM. Williams
Physical Review Letters · 2019 · American Physical Society
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Abstract
A narrow pentaquark state, P_{c}(4312)^{+}, decaying to J/ψp, is discovered with a statistical significance of 7.3σ in a data sample of Λ_{b}^{0}→J/ψpK^{-} decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The P_{c}(4450)^{+} pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, P_{c}(4440)^{+} and P_{c}(4457)^{+}, where the statistical significance of this two-peak interpretation is 5.4σ. The proximity of the Σ_{c}^{+}D[over ¯]^{0} and Σ_{c}^{+}D[over ¯]^{*0} thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.