We report measurements of the lifetimes of the Lambda(+)(c), Xi(+)(c) and Xi(0)(c) charm baryons using proton- proton collision data at center- of- mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment. The charm baryons are reconstructed through the decays Lambda(+)(c) -> pK(-)pi(+),. Xi(+)(c) -> pK(-) pi(+) and Xi(0)(c) -> pK(-) K- pi(+), and originate from semimuonic decays of beauty baryons. The lifetimes are measured relative to that of the D+ meson, and are determined to be tau(Lambda(+)(c)( = 203.5 +/- 1.0 +/- 1.3 +/- 1.4 fs; tau(Xi(+)(c)) = 456.8 +/- 3.5 +/- 2.9 +/- 3.1 fs; tau(Xi(0)(c)) = 154.5 +/- 1.7 +/- 1.6 +/- 1.0 fs; where the uncertainties are statistical, systematic, and due to the uncertainty in the D+ lifetime. The measurements are approximately 3- 4 times more precise than the current world average values. The. Lambda(+)c and Xi(+)(c) lifetimes are in agreement with previous measurements; however, the Xi(0)(c) baryon lifetime is approximately 3.3 standard deviations larger than the world average value.

Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes. PHYSICAL REVIEW D, 100(3) [10.1103/PhysRevD.100.032001].

Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes

Belloli N.;Borsato M.;Calvi M.;Carniti P.;Fazzini D.;Gotti C.;Martinelli M.;Petruzzo M.;
2019

Abstract

We report measurements of the lifetimes of the Lambda(+)(c), Xi(+)(c) and Xi(0)(c) charm baryons using proton- proton collision data at center- of- mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment. The charm baryons are reconstructed through the decays Lambda(+)(c) -> pK(-)pi(+),. Xi(+)(c) -> pK(-) pi(+) and Xi(0)(c) -> pK(-) K- pi(+), and originate from semimuonic decays of beauty baryons. The lifetimes are measured relative to that of the D+ meson, and are determined to be tau(Lambda(+)(c)( = 203.5 +/- 1.0 +/- 1.3 +/- 1.4 fs; tau(Xi(+)(c)) = 456.8 +/- 3.5 +/- 2.9 +/- 3.1 fs; tau(Xi(0)(c)) = 154.5 +/- 1.7 +/- 1.6 +/- 1.0 fs; where the uncertainties are statistical, systematic, and due to the uncertainty in the D+ lifetime. The measurements are approximately 3- 4 times more precise than the current world average values. The. Lambda(+)c and Xi(+)(c) lifetimes are in agreement with previous measurements; however, the Xi(0)(c) baryon lifetime is approximately 3.3 standard deviations larger than the world average value.
Articolo in rivista - Articolo scientifico
Lifetime measurement; Flavour Physics; LHCb; LHC Collider; Particle Physics
English
2019
100
3
032001
none
Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Precision measurement of the Λc+, Ξc+, and Ξc0 baryon lifetimes. PHYSICAL REVIEW D, 100(3) [10.1103/PhysRevD.100.032001].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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/10281/248026
Citazioni
  • Scopus 37
  • ???jsp.display-item.citation.isi??? 24
Social impact