First Evidence of New Physics in b <-> s Transitions

  • Thread starter Barmecides
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First Evidence of New Physics in b <--> s Transitions

Hi,

please look at the following arXiv :

http://arxiv.org/abs/0803.0659

First Evidence of New Physics in b <--> s Transitions
Authors: UTfit Collaboration: M. Bona, M. Ciuchini, E. Franco, V. Lubicz, G. Martinelli, F. Parodi, M. Pierini, P. Roudeau, C. Schiavi, L. Silvestrini, V. Sordini, A. Stocchi, V. Vagnoni
(Submitted on 5 Mar 2008)
Abstract: We combine all the available experimental information on Bs mixing, including the very recent tagged analyses of Bs to J/Psi phi by the CDF and D0 collaborations. We find that the phase of the Bs mixing amplitude deviates more than 3 sigma from the Standard Model prediction. While no single measurement has a 3 sigma significance yet, all the constraints show a remarkable agreement with the combined result. This is a first evidence of physics beyond the Standard Model. This result disfavours New Physics models with Minimal Flavour Violation with the same significance.
 

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  • #3
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Hello,

Yeah I saw this. This is a very important process to the MSSM, and the fact that it changed last summer (from above the SM prediction to below it) is also pretty crucial.

Check out the MSSM weather forcast papers, too.
http://arxiv.org/abs/0705.0487
http://arxiv.org/abs/0705.2012

but what you describe, isn't it Minimal Flavor Violation which seems disfavored by this measurement ?
 
  • #4
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There is a new ph paper on this Bs excess related to SUSY :
http://arxiv.org/PS_cache/arxiv/pdf/0803/0803.1898v1.pdf [Broken]
In this paper, they introduce R-parity violation to explain both Bs and Ds->lnu excess. The only problem now I guess is that SUSY has no more any dark matter candidate ?
They say neutralino decays to mucb.
 
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  • #5
kdv
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There is a new ph paper on this Bs excess related to SUSY :
http://arxiv.org/PS_cache/arxiv/pdf/0803/0803.1898v1.pdf [Broken]
In this paper, they introduce R-parity violation to explain both Bs and Ds->lnu excess. The only problem now I guess is that SUSY has no more any dark matter candidate ?
They say neutralino decays to mucb.

But the lightest supersymmetric particle is absolutely stable, isn't? So if the neutralino is unstable what does it decay into?
 
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  • #6
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But the lightest supersymmetric particle is absolutely stable, isn't?

Not if R-parity is violated.
 

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