Two structures are observed close to the kinematic threshold in the Ξ0bπ− mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0  fb−1, recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity JP=(1/2)+ and JP=(3/2)+ states, denoted Ξ'−b and Ξ*−b. Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be m(Ξ'−b)m(Ξ0b)−m(π−)=3.653±0.018±0.006  MeV/c2, m(Ξ*−b)−m(Ξ0b)−m(π−)=23.96±0.12±0.06  MeV/c2, Γ(Ξ*−b)=1.65±0.31±0.10  MeV, where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of Γ(Ξ'−b)<0.08  MeV at 95% confidence level. Relative production rates of these states are also reported.

Observation of two new Ξb- Baryon resonances / Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Anderson, J., Andreassen, R., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 114:6(2015). [10.1103/PhysRevLett.114.062004]

Observation of two new Ξb- Baryon resonances

Capriotti, L.;Casse, G.;Di Domenico, A.;SARTI, ALESSIO;SCIUBBA, Adalberto;
2015

Abstract

Two structures are observed close to the kinematic threshold in the Ξ0bπ− mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0  fb−1, recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity JP=(1/2)+ and JP=(3/2)+ states, denoted Ξ'−b and Ξ*−b. Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be m(Ξ'−b)m(Ξ0b)−m(π−)=3.653±0.018±0.006  MeV/c2, m(Ξ*−b)−m(Ξ0b)−m(π−)=23.96±0.12±0.06  MeV/c2, Γ(Ξ*−b)=1.65±0.31±0.10  MeV, where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of Γ(Ξ'−b)<0.08  MeV at 95% confidence level. Relative production rates of these states are also reported.
2015
Bottom baryons (|B|>0),Hadronic decays
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of two new Ξb- Baryon resonances / Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Anderson, J., Andreassen, R., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 114:6(2015). [10.1103/PhysRevLett.114.062004]
File allegati a questo prodotto
File Dimensione Formato  
PhysRevLett.114.062004.pdf

accesso aperto

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Creative commons
Dimensione 275.84 kB
Formato Adobe PDF
275.84 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/11573/836068
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 73
  • ???jsp.display-item.citation.isi??? 53
social impact