Observation of the Doubly Charmed Baryon Ξ c c + +
- R. Aaij
- B. Adeva
- M. Adinolfi
- Z. Ajaltouni
- S. Akar
- J. Albrecht
- F. Alessio
- Michael Thomas Alexander
- A. Alfonso Albero
- Shaheen Sardar Ali
- G. Alkhazov
- P. Álvarez Cartelle
- Antonio Augusto Alves Junior
- S. Amato
- S. Amerio
- Y. Amhis
- L. An
- L. Anderlini
- G. Andreassi
- M. Andreotti
- J. E. Andrews
- R. B. Appleby
- F. Archilli
- P. d’Argent
- J. Arnau Romeu
- A. Artamonov
- M. Artuso
- E. Aslanides
- G. Auriemma
- M. Baalouch
- I. Babuschkin
- S. Bachmann
- J. J. Back
- A. Badalov
- C. Baesso
- S. Baker
- V. Balagura
- W. Baldini
- A. Baranov
- Roger John Barlow
- C. Barschel
- S. Barsuk
- W Barter
- F. Baryshnikov
- V. Batozskaya
- V. Battista
- A. Bay
- L. Beaucourt
- J. Beddow
- F. Bedeschi
- I. Bediaga
- A. Beiter
- L. J. Bel
- N. Beliy
- V. Bellée
- N. Belloli
- K. Belous
- I. Belyaev
- E. Ben-Haim
- G. Bencivenni
- S. Benson
- S. Beranek
- Alexander Berezhnoy
- R. Bernet
- D. Berninghoff
- E. Bertholet
- A. Bertolin
- C. Betancourt
- F. Betti
- M.-O. Bettler
- M. van Beuzekom
- Ia. Bezshyiko
- S. Bifani
- P. Billoir
- A. Birnkraut
- A. Bitadze
- A. Bizzeti
- M. B. Bjoern
- T Blake
- F. Blanc
- J. Blouw
- S. Blusk
- V. Bocci
- T. Boettcher
- A. Bondar
- N. Bondar
- Walter Marcello Bonivento
- Igor G. Bordyuzhin
- A. Borgheresi
- S. Borghi
- M. Borisyak
- M. Borsato
- M. Borysova
- F. Bossu
- M. Boubdir
- T. J. V. Bowcock
- E. Bowen
- C. Bozzi
- S. Braun
- T. Britton
- MWM. Williams
Physical Review Letters · 2017 · American Physical Society
2 views · 0 downloads
Abstract
A highly significant structure is observed in the Λ_{c}^{+}K^{-}π^{+}π^{+} mass spectrum, where the Λ_{c}^{+} baryon is reconstructed in the decay mode pK^{-}π^{+}. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Ξ_{cc}^{++}. The difference between the masses of the Ξ_{cc}^{++} and Λ_{c}^{+} states is measured to be 1334.94±0.72(stat.)±0.27(syst.) MeV/c^{2}, and the Ξ_{cc}^{++} mass is then determined to be 3621.40±0.72(stat.)±0.27(syst.)±0.14(Λ_{c}^{+}) MeV/c^{2}, where the last uncertainty is due to the limited knowledge of the Λ_{c}^{+} mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 fb^{-1}, and confirmed in an additional sample of data collected at 8 TeV.