S-waves and the extraction of bs

Sheldon Stone

Research output: Contribution to journalConference Articlepeer-review


The CP Violating asymmetry in Bs mixing (βs) is one of the most promising measurements where physics beyond the Standard Model could be revealed. As such, analyses need to be subjected to great scrutiny. The mode Bs → J/φφ has been used, and the mode B s → ΦΦ proposed for future measurements. These modes both have two vector particles in the final state and thus angular analyses must be used to disentangle the contributions from CP+ and CP- configurations. The angular distributions, however, could be distorted by the presence of S-waves masquerading as low mass K+K- pairs, that could result in erroneous values of βs. The S-waves could well be the result of a final state formed from an s-quark s̄-quark pair in a 0+ spin-parity state, such as the f0 (980) meson. Data driven and theoretical estimates of the Bs decay rate into the CP+ final state J/Φf0(980) are given, when f0 → π+π-. The S-wave contribution in J / Φφ should be taken into account when determining βs by including a K+K- S-wave amplitude in the fit. This may change the central value of current results and will also increase the statistical uncertainty. Importantly, the J/ΦΦ0(980) mode has been suggested as an alternative channel for measuring βs.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - 2010
EventFlavor Physics and CP Violation 2010, FPCP 2010 - Turin, Italy
Duration: May 25 2010May 29 2010

ASJC Scopus subject areas

  • General


Dive into the research topics of 'S-waves and the extraction of bs'. Together they form a unique fingerprint.

Cite this