New physics upper bound on the branching ratio of Bs→l+l− and Bs→l+l−γ
DSpace at IIT Bombay
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Title |
New physics upper bound on the branching ratio of Bs→l+l− and Bs→l+l−γ
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Creator |
ALOK, ASHUTOSH KUMAR
UMA SANKAR, S |
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Subject |
standard model
semileptonic decays electromagnetic decays meson leptonic decay |
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Description |
We consider the most general new physics effective Lagrangian for b→sl+l−. We derive the upper limit on the branching ratio for the processes Bs→l+l− where l=e,μ, subject to the current experimental bounds on related processes, B→(K,K*)l+l−. If the new physics interactions are of vector/axial-vector form, the present measured rates for B→(K,K*)l+l− constrain B(Bs→l+l−) to be of the same order of magnitude as their respective Standard Model (SM) predictions. On the other hand, if the new physics interactions are of scalar/pseudoscalar form, B→(K,K*)l+l− rates do not impose any useful constraint on B(Bs→l+l−) and the branching ratios of these decays can be as large as present experimental upper bounds. If future experiments measure B(Bs→l+l−) to be 10−8 then the new physics giving rise to these decays has to be of the scalar/pseudoscalar form. We also consider the effect of new physics on B(Bs→l+l−γ) subject to the present experimental constraints on B→(K,K*)l+l− and B→K*γ. New physics in form scalar/pseudoscalar, which makes a very large contribution to Bs→l+l−, makes no contribution at all to Bs→l+l−γ due to angular momentum conservation. New Physics in the form of vector/axial-vector operators is constrained by the data on B→(K,K*)l+l− and new physics in the form of tensor/pseudo-tensor is constrained by the data on B→K*γ. In both cases, enhancement of B(Bs→l+l−γ) much beyond the SM expectation is impossible. In conclusion, present data on B→(K,K*) transitions allow for large B(Bs→l+l−) but do not allow B(Bs→l+l−γ) to be much larger than its SM expectation.
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Publisher |
Elsevier
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Date |
2009-04-08T06:49:27Z
2011-11-25T20:51:33Z 2011-12-26T13:08:32Z 2011-12-27T05:56:28Z 2009-04-08T06:49:27Z 2011-11-25T20:51:33Z 2011-12-26T13:08:32Z 2011-12-27T05:56:28Z 2007 |
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Type |
Article
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Identifier |
Nuclear Physics B - Proceedings Supplements 167, 241-243
0920-5632 http://dx.doi.org/10.1016/j.nuclphysbps.2006.12.056 http://hdl.handle.net/10054/1157 http://dspace.library.iitb.ac.in/xmlui/handle/10054/1157 |
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Language |
en
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