Precise determination of the B0s-B0sbar oscillation frequency
LHCb collaboration: R. Aaij, C. Abell\'an Beteta, T. Ackernley, B., Adeva, M. Adinolfi, H. Afsharnia, C.A. Aidala, S. Aiola, Z. Ajaltouni, S., Akar, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, Z. Aliouche,, G. Alkhazov, P. Alvarez Cartelle, S. Amato, Y. Amhis
TL;DR
This paper reports a highly precise measurement of the B0s-B0sbar oscillation frequency, significantly improving the accuracy over previous results and providing a key parameter for understanding meson mixing.
Contribution
The paper presents the most precise measurement of the B0s-B0sbar oscillation frequency to date, using new data from the LHCb detector and combining it with previous measurements.
Findings
Measured deltams = 17.7683 ± 0.0062 ps-1
Improved precision by a factor of two over previous measurements
Provides a legacy measurement for future studies
Abstract
Mesons comprising a beauty quark and a strange quark can oscillate between particle (B0s) and antiparticle (B0s) flavour eigenstates, with a frequency given by the mass difference between heavy and light mass eigenstates, deltams. Here we present ameasurement of deltams using B0s2DsPi decays produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The oscillation frequency is found to be deltams = 17.7683 +- 0.0051 +- 0.0032 ps-1, where the first uncertainty is statistical and the second systematic. This measurement improves upon the current deltams precision by a factor of two. We combine this result with previous LHCb measurements to determine deltams = 17.7656 +- 0.0057 ps-1, which is the legacy measurement of the original LHCb detector.
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