Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing new physics in $B_s \to (K,K^*)\tau \nu$ and $B \to \pi \tau
  \nu$ decays   Motivated by the anomalies present in $b \to u$ and $b \to c$ semileptonic
decays, we study the corresponding $B_s \to (K,K^*) \tau \nu$ and $B \to \pi
\tau \nu$ decays within an effective field theory formalism. Our analysis is
based on a strict model dependent assumption, i.e., we assume that $b \to u$
and $b \to c$ transition decays exhibit similar new physics pattern. We give
prediction of various observables such as the branching fraction, ratio of
branching ratio, lepton side forward-backward asymmetry, longitudinal
polarization fraction of the charged lepton and convexity parameter in the
standard model and in the presence of vector type new physics couplings.

37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int