Shedding Light on the "Dark Side" of $B^0_d$--$\bar B^0_d$ Mixing through $B_d\toπ^+π^-$, $K\toπν\barν$ and $B_{d,s}\toμ^+μ^-$

Details Shedding Light on the "Dark Side" of $B^0_d$--$\bar B^0_d$ Mixing through $B_d\toπ^+π^-$, $K\toπν\barν$ and $B_{d,s}\toμ^+μ^-$ Shedding Light on the "Dark Side" of $B^0_d$--$\bar B^0_d$ Mixing through $B_d\toπ^+π^-$, $K\toπν\barν$ and $B_{d,s}\toμ^+μ^-$

2003-02-25

arxiv.org/abs/hep-ph/0302229v2

JHEP 0305:053,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, 3 figures, minor modifications, to appear in JHEP

Scientific paper

10.1088/1126-6708/2003/05/053

In a wide class of NP models, which can be motivated through generic arguments and within SUSY, we obtain large contributions to $B^0_d$--$\bar B^0_d$ mixing, but not to $\Delta B=1$ processes. If we assume such a scenario, the solutions $\phi_d\sim 47^\circ\lor 133^\circ$ for the $B^0_d$--$\bar B^0_d$ mixing phase implied by $A_{CP}^{mix}(B_d\to J/\psi K_S)$ cannot be converted directly into a constraint in the $\rho$--$\eta$ plane. However, we may complement $\phi_d$ with $|V_{ub}/V_{cb}|$ and the recently measured CP asymmetries in $B_d\to\pi^+ \pi^-$ to determine the unitarity triangle, with its angles $\alpha$, $\beta$ and $\gamma$. To this end, we have also to control penguin effects, which we do by means of the $B_d\to\pi^\mp K^\pm$ branching ratio. Interestingly, the present data show a perfectly consistent picture not only for the ``standard'' solution of $\phi_d\sim 47^\circ$, but also for $\phi_d\sim 133^\circ$. In the latter case, the preferred region for the apex of the unitarity triangle is in the second quadrant, allowing us to accommodate conveniently $\gamma>90^\circ$, which is also favoured by other non-leptonic B decays such as $B\to\pi K$. Moreover, also the prediction for BR$(K^+\to\pi^+\nu\bar\nu})$ can be brought to better agreement with experiment. Further strategies to explore this scenario with the help of $B_{d,s}\to\mu^+\mu^-$ decays are discussed as well.

Affiliated with

Also associated with

No associations

Rating

Shedding Light on the "Dark Side" of $B^0_d$--$\bar B^0_d$ Mixing through $B_d\toπ^+π^-$, $K\toπν\barν$ and $B_{d,s}\toμ^+μ^-$ does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Shedding Light on the "Dark Side" of $B^0_d$--$\bar B^0_d$ Mixing through $B_d\toπ^+π^-$, $K\toπν\barν$ and $B_{d,s}\toμ^+μ^-$, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shedding Light on the "Dark Side" of $B^0_d$--$\bar B^0_d$ Mixing through $B_d\toπ^+π^-$, $K\toπν\barν$ and $B_{d,s}\toμ^+μ^-$ will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-482685