Observation of excited Lambda_b0 baryons
LHCb collaboration: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva,, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio,, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves Jr, S., Amato, Y. Amhis, J. Anderson, R.B. Appleby
TL;DR
This paper reports the observation of two excited Lambda_b0 baryon states in proton-proton collision data, providing precise mass measurements and confirming their orbitally-excited nature with high statistical significance.
Contribution
First observation of two narrow excited Lambda_b0 baryons with precise mass measurements and high significance, confirming their orbitally-excited states.
Findings
Observed two narrow excited Lambda_b0 states
Measured their masses with high precision
Confirmed their orbitally-excited nature
Abstract
Using pp collision data corresponding to 1.0 fb-1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Lambda_b0pi+pi- spectrum with masses 5911.97 +- 0.12(stat) +- 0.02(syst) +- 0.66(Lambda_b0 mass) MeV/c^2 and 5919.77 +- 0.08(stat) +- 0.02(syst) +- 0.66(Lambda_b0 mass) MeV/c^2. The significances of the observations are 5.2 and 10.2 standard deviations, respectively. These states are interpreted as the orbitally-excited Lambda_b0 baryons, Lambda_b*0(5912) and Lambda_b*0(5920).
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