Abstract
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/ψφ has been used, and the mode Bs → 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 s-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/ψ f0(980) are given, when f0 → π+π−. The S-wave contribution in J/ψφ 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/ψ f0(980) mode has been suggested as an alternative channel for measuring βs. An expanded version of this paper is available at arXiv:1009.4939 [hep-ph].
| Original language | English (US) |
|---|---|
| Journal | Proceedings of Science |
| Volume | 120 |
| State | Published - Jan 1 2010 |
| Event | 35th International Conference of High Energy Physics, ICHEP 2010 - Paris, France Duration: Jul 22 2010 → Jul 28 2010 |
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ASJC Scopus subject areas
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Cite this
S-waves and the measurement of βs in Bs decays. / Stone, Sheldon.
In: Proceedings of Science, Vol. 120, 01.01.2010.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - S-waves and the measurement of βs in Bs decays
AU - Stone, Sheldon
PY - 2010/1/1
Y1 - 2010/1/1
N2 - 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/ψφ has been used, and the mode Bs → 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 s-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/ψ f0(980) are given, when f0 → π+π−. The S-wave contribution in J/ψφ 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/ψ f0(980) mode has been suggested as an alternative channel for measuring βs. An expanded version of this paper is available at arXiv:1009.4939 [hep-ph].
AB - 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/ψφ has been used, and the mode Bs → 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 s-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/ψ f0(980) are given, when f0 → π+π−. The S-wave contribution in J/ψφ 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/ψ f0(980) mode has been suggested as an alternative channel for measuring βs. An expanded version of this paper is available at arXiv:1009.4939 [hep-ph].
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UR - http://www.scopus.com/inward/citedby.url?scp=85053813934&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:85053813934
VL - 120
JO - Proceedings of Science
JF - Proceedings of Science
SN - 1824-8039
ER -