タイトル:
LHC phenomenology in light of R(D) and R(D*) anomalies

アブストラクト:
The combined analysis of the BaBar, Belle, and LHCb data on B to D tau nu,
B to D* tau nu, and Bc to J/Psi tau nu decay observables shows violation of
the lepton flavor universality which deviates from the standard model
prediction at 3-4 sigma levels, called R(D(*)) anomaly. This B anomaly
suggests some specific leptoquark models as new physics. Such leptoquark
models have been probed by the resonant search at the LHC. On the other
hand, it is also possible that the leptoquark is probed by the non-resonant
search using large missing transverse momentum cut, where a hard neutrino
is recognized as such. In this talk, first, I'll review the current status
of the R(D(*)) anomaly. Then, I'll present preliminary results of our
ongoing work: we study sensitivity of non-resonant new physics search at
the LHC in a high-energy tau lepton with a b-jet and large missing
transverse momentum final states. It is shown that the requirement of the
additional b jet sufficiently reduces  the standard-model background. This
process can be dominated by g c to b tau nu contact interaction which are
directly correlated with the b to c tau nu anomalies. Therefore one could
probe the B-anomaly at the LHC without producing heavy leptoquark.