A highly significant structure is observed in the Λ+cK−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/c2, and the Ξ++cc mass is then determined to be 3621.40±0.72(stat.)±0.27(syst.)±0.14(Λ+c)  MeV/c2, 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.

Observation of the Doubly Charmed Baryon Ξcc + + / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 1092-0145. - 119:11(2017). [10.1103/PhysRevLett.119.112001]

Observation of the Doubly Charmed Baryon Ξcc + +

Capriotti, L.;Casse, G.;Kazeev, N.;Sarti, A.;Sciubba, A.;
2017

Abstract

A highly significant structure is observed in the Λ+cK−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/c2, and the Ξ++cc mass is then determined to be 3621.40±0.72(stat.)±0.27(syst.)±0.14(Λ+c)  MeV/c2, 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.
2017
Decays of bottom mesons, Decays of J/ψ, Υ, and other quarkonia, Bottom mesons (|B|>0), Exotic mesons
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of the Doubly Charmed Baryon Ξcc + + / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 1092-0145. - 119:11(2017). [10.1103/PhysRevLett.119.112001]
File allegati a questo prodotto
File Dimensione Formato  
PhysRevLett.119.112001.pdf

accesso aperto

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Creative commons
Dimensione 333.73 kB
Formato Adobe PDF
333.73 kB Adobe PDF

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074300
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 536
  • ???jsp.display-item.citation.isi??? 448
social impact