A sample of pp collision data, corresponding to an integrated luminosity of 5.4 fb(-1) and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the Xi(0)(b) baryon to that of the Lambda(0)(b) baryon, r(tau) equivalent to tau(Xi 0b)/tau(Lambda 0b). The value r(tau)(Run 2) = 1.004 +/- 0.009 +/- 0.006 is obtained, where the first uncertainty is statistical and the second systematic. This value is averaged with the corresponding value from Run 1 to obtain r(tau) = 1.004 +/- 0.008 +/- 0.005. Multiplying by the known value of the Lambda(0)(b) lifetime yields tau(Xi 0b) = 1.475 +/- 0.012 +/- 0.008 +/- 0.009 ps, where the last uncertainty is due to the limited knowledge of the Lambda(0)(b) lifetime. This measurement improves the precision of the current world average of the Xi(0)(b) lifetime by about a factor of two, and is in good agreement with the most recent theoretical predictions.
Precision measurement of the Ξb0 baryon lifetime
De Angelis, C.;Dettori, F.;Fabiano, F.;Litvinov, R.;Manca, G.;Oldeman, R.;Provenzano, D.;Saitta, B.;
2025-01-01
Abstract
A sample of pp collision data, corresponding to an integrated luminosity of 5.4 fb(-1) and collected by the LHCb experiment during LHC Run 2, is used to measure the ratio of the lifetime of the Xi(0)(b) baryon to that of the Lambda(0)(b) baryon, r(tau) equivalent to tau(Xi 0b)/tau(Lambda 0b). The value r(tau)(Run 2) = 1.004 +/- 0.009 +/- 0.006 is obtained, where the first uncertainty is statistical and the second systematic. This value is averaged with the corresponding value from Run 1 to obtain r(tau) = 1.004 +/- 0.008 +/- 0.005. Multiplying by the known value of the Lambda(0)(b) lifetime yields tau(Xi 0b) = 1.475 +/- 0.012 +/- 0.008 +/- 0.009 ps, where the last uncertainty is due to the limited knowledge of the Lambda(0)(b) lifetime. This measurement improves the precision of the current world average of the Xi(0)(b) lifetime by about a factor of two, and is in good agreement with the most recent theoretical predictions.| File | Dimensione | Formato | |
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