Using a proton-proton collision data sample corresponding to an integrated luminosity of 3fb-1 collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξb0→Ξc+π-, Ξc+→pK-π+ signal decays are reconstructed. From this sample, the first measurement of the Ξb0 baryon lifetime is made, relative to that of the Λb0 baryon. The mass differences M(Ξb0)-M(Λb0) and M(Ξc+)-M(Λc+) are also measured with precision more than 4 times better than the current world averages. The resulting values are τΞb0τΛb0=1.006±0. 018±0.010,M(Ξb0)-M(Λb0)=172.44±0.39±0.17MeV/c2, M(Ξc+)-M(Λc+)=181.51±0.14±0.10MeV/c2,where the first uncertainty is statistical and the second is systematic. The relative rate of Ξb0 to Λb0 baryon production is measured to be fΞb0fΛ b0B(Ξb0→Ξc+π-)B(Λb0→Λc+π-) B(Ξc+→pK-π+)B(Λc+→pK-π+)=(1.88±0.04±0. 03)×10-2,where the first factor is the ratio of fragmentation fractions, b→Ξb0 relative to b→Λb0. Relative production rates as functions of transverse momentum and pseudorapidity are also presented. © 2014 CERN, for the LHCb Collaboration.

Precision measurement of the mass and lifetime of the Ξb0 baryon / R., A., B., A., M., A., A., A., Z., A., S., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. a., A., S., A., S., A., Y., A., L., A.n., L., A., J., A., R., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:3(2014). [10.1103/physrevlett.113.032001]

Precision measurement of the mass and lifetime of the Ξb0 baryon

SARTI, ALESSIO;SCIUBBA, Adalberto;
2014

Abstract

Using a proton-proton collision data sample corresponding to an integrated luminosity of 3fb-1 collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξb0→Ξc+π-, Ξc+→pK-π+ signal decays are reconstructed. From this sample, the first measurement of the Ξb0 baryon lifetime is made, relative to that of the Λb0 baryon. The mass differences M(Ξb0)-M(Λb0) and M(Ξc+)-M(Λc+) are also measured with precision more than 4 times better than the current world averages. The resulting values are τΞb0τΛb0=1.006±0. 018±0.010,M(Ξb0)-M(Λb0)=172.44±0.39±0.17MeV/c2, M(Ξc+)-M(Λc+)=181.51±0.14±0.10MeV/c2,where the first uncertainty is statistical and the second is systematic. The relative rate of Ξb0 to Λb0 baryon production is measured to be fΞb0fΛ b0B(Ξb0→Ξc+π-)B(Λb0→Λc+π-) B(Ξc+→pK-π+)B(Λc+→pK-π+)=(1.88±0.04±0. 03)×10-2,where the first factor is the ratio of fragmentation fractions, b→Ξb0 relative to b→Λb0. Relative production rates as functions of transverse momentum and pseudorapidity are also presented. © 2014 CERN, for the LHCb Collaboration.
2014
transverse momenta; precision measurement; center-of-mass energies; tellurium compounds; production rates; pseudorapidities; high energy physics; integrated luminosity; hadrons; mass difference; proton proton collisions
01 Pubblicazione su rivista::01a Articolo in rivista
Precision measurement of the mass and lifetime of the Ξb0 baryon / R., A., B., A., M., A., A., A., Z., A., S., A., J., A., F., A., M., A., S., A., G., A., P. A., C., A. a., A., S., A., S., A., Y., A., L., A.n., L., A., J., A., R., A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:3(2014). [10.1103/physrevlett.113.032001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/665056
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