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Setting Limits on Supersymmetry Using Simplified Models

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Published on: November 15, 2013

Refining new-physics searches in B→Dτν with lattice QCD.

Jon A Bailey¹, A Bazavov, C Bernard

¹Department of Physics and Astronomy, Seoul National University, South Korea.

Physical Review Letters

|September 26, 2012

Summary

This summary is machine-generated.

This study calculates the B→Dτν decay ratio using lattice QCD, yielding a result closer to experimental measurements. The findings help reduce tension between the Standard Model and experimental data for this particle physics process.

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Area of Science:

High Energy Physics
Particle Physics
Quantum Chromodynamics

Background:

The semileptonic decay B→Dτν is sensitive to new physics, particularly scalar currents.
Experimental data from BABAR shows a discrepancy with Standard Model predictions for the R(D) ratio.

Purpose of the Study:

To compute the R(D) ratio using unquenched lattice QCD for a precise Standard Model prediction.
To investigate the impact of charged scalar exchange, like from a charged Higgs boson, on the R(D) ratio.

Main Methods:

Utilized hadronic form factors computed via ab initio full QCD lattice calculations.
Employed unquenched lattice QCD for improved accuracy in form factor determination.

Main Results:

Calculated R(D) = 0.316(12)(7), the first Standard Model calculation from full QCD with reduced uncertainty.
The computed R(D) value reduces the tension with experimental measurements by approximately 1σ.
Predicted the longitudinal-polarization ratio P(L)(D) = 0.325(4)(3).

Conclusions:

The precise lattice QCD calculation of R(D) offers a more accurate Standard Model prediction.
The results are consistent with models involving charged scalar exchange, such as the type-II two-Higgs-doublet model.
This work provides a crucial Standard Model benchmark for understanding B meson decays.