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Precocious signs of new physics: Are we eight now?

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Abstract

Although the CKM-paradigm seems to work to an accuracy of about 15–20%, we emphasize that there are by now several indications that suggest the need for a beyond the Standard Model CP-odd phase. The value of sin 2β measured via the goldplated (tree) mode, B → ψK s is smaller than the value deduced by using improved lattice matrix elements. The value of sin 2β measured via ‘penguin-dominated’ (loop) decays tends to be even smaller still. There is also a rather large difference between the direct CP asymmetries in \( \bar B^0 \) → K − π + and B − → K − π 0 that is rather difficult to understand. More recently, CDF and D0 are finding about a 2σ signal in CP asymmetry in the corresponding gold-plated mode B s → ψϕ. If true, this would be consistent with the indications of new CP-phase in penguin b → s transitions seen at B-factories. After describing these possible signs of trouble for the SM-CKM paradigm, we give a brief discussion of some of the BSM scenarios that could be the underlying cause of these deviations. In particular, we find that the data are quite suggestive of a fourth family with m′ t in the range of 400–600 GeV as perhaps the simplest BSM candidate which ‘naturally’ explains the data.

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  1. Physics Department, Brookhaven National Laboratory, Upton, NY, 11973, USA

    Amarjit Soni

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  1. Amarjit Soni
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Soni, A. Precocious signs of new physics: Are we eight now?. Pramana - J Phys 72, 161–168 (2009). https://doi.org/10.1007/s12043-009-0013-z

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