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

In summary: Then the lightest supersymmetric particle can decay. This is what the paper is proposing as an explanation for the Bs and Ds excesses. In summary, a recent study combining all available experimental data on Bs mixing has found evidence of new physics beyond the Standard Model, as the phase of the Bs mixing amplitude deviates more than 3 sigma from the prediction. This result disfavours Minimal Flavour Violation models and a new paper suggests introducing R-parity violation in supersymmetry to explain the excesses. However, this raises questions about the stability of the lightest supersymmetric particle.
  • #1
Barmecides
80
0
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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  • #2
  • #3
Hello,

BenTheMan said:
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
There is a new ph paper on this Bs excess related to SUSY :
http://arxiv.org/PS_cache/arxiv/pdf/0803/0803.1898v1.pdf
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
Barmecides said:
There is a new ph paper on this Bs excess related to SUSY :
http://arxiv.org/PS_cache/arxiv/pdf/0803/0803.1898v1.pdf
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?
 
Last edited by a moderator:
  • #6
kdv said:
But the lightest supersymmetric particle is absolutely stable, isn't?

Not if R-parity is violated.
 

1. What is the "First Evidence of New Physics in b <-> s Transitions"?

The "First Evidence of New Physics in b <-> s Transitions" refers to a recent scientific observation that suggests the possibility of new physics beyond the Standard Model in the interactions between bottom and strange quarks.

2. How was this evidence discovered?

The evidence was discovered through the analysis of data from the Large Hadron Collider (LHC) at CERN, which collides protons at high energies to study the fundamental building blocks of the universe.

3. What does this mean for our understanding of the universe?

If this evidence is confirmed, it could lead to a major breakthrough in our understanding of the universe and the fundamental laws of physics. It could potentially open up new avenues for research and pave the way for a more comprehensive theory of everything.

4. What are the potential implications of this discovery?

The potential implications of this discovery are vast and could have a significant impact on a wide range of fields, including particle physics, cosmology, and astrophysics. It could also have practical applications in technology and energy production.

5. What are the next steps in further investigating this evidence?

Further studies and experiments will need to be conducted to confirm this evidence and rule out any other explanations. This could involve collecting more data at the LHC or conducting experiments at other facilities. The scientific community will also work to develop new theories that could explain this evidence and guide future research in this area.

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