Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hot Topics from the BABAR Experiment   With a sample of about 384 million BBbar pairs recorded with the BABAR
detector, we search for the flavor-changing charged current transition B+ ->
\tau\nu and perform an amplitude analysis of the effective flavor-changing
neutral current transition B+ -> \phi(1020)K*(892)+. We also extend our search
for other K* final states in the decay B0 -> phi(1020)K*0 with a large K*0 ->
K+pi- invariant mass. Two samples of events with one reconstructed hadronic B
decay or one reconstructed semileptonic B decay are selected, and in the recoil
a search for B+ -> \tau\nu is performed. We find a 2.6 sigma (3.2 sigma not
including expected background uncertainty) excess in data which can be
converted to a preliminary branching fraction central value of BR(B+ -> \tau\nu
) = (1.20 +0.40-0.38 +0.29-0.30 +-0.22) 10^-4. With the decay B+- ->
\phi(1020)K*(892)+-, twelve parameters are measured, where our measurements of
f_L=0.49+-0.05+-0.03, f_perp=0.21+-0.05+-0.02, and the strong phases point to
the presence of a substantial helicity-plus amplitude from a presently unknown
source.

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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph