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Probing novel TeV physics through precision calculations of scalar and tensor charges of the nucleon

We present an update on the calculation of matrix elements of iso-vector scalar, axial and tensor charges between a neutron and a proton state. These matrix elements are needed to probe novel scalar and tensor interactions in neutron beta-decay that can arise in extensions of the Standard Model at the TeV scale. Our calculations are being done using valence clover fermions on dynamical N_f=2+1+1 HISQ configurations generated by the MILC Collaboration. We provide preliminary estimates of the dependence of these matrix elements on the light quark masses, lattice spacing, and the time separation between the source and sink of the nucleons. We also find that the renormalization constants calculated using the RI-sMOM scheme are close to unity for the HYP smeared HISQ lattices.

preprint2012arXivOpen access
Rajan GuptaTanmoy BhattacharyaAnosh JosephSaul D. CohenHuey-Wen Lin
hep-lat
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Rajan GuptaTanmoy BhattacharyaAnosh JosephSaul D. CohenHuey-Wen Lin

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