Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Right-Handed Currents in B Decay Revisited   We critically re-examine the case for and against a sizeable right-handed
component in the $b\to c$ charged current coupling with a strength $\xi$
relative to the conventional left-handed current. Using data from CLEO on the
decay $B\to D^*\ell \nu$, as well as our knowledge of $V_{cb}$ extracted from
both inclusive and exclusive processes, we are able to determine the presently
allowed parameter space for $\xi$ via HQET. We then identify several
observables which could be measured at $B$ factories to either strengthen these
constraints or otherwise observe right-handed currents. This parameter space
region is found to be consistent with the low degree of $\Lambda_b$
polarization as determined by ALEPH as well as the measurements of the charged
lepton and neutrino energy spectra from $b$ decay made by L3. We discuss how
future measurements of semileptonic decay distributions may distinguish between
exotic $\Lambda_b$ depolarization mechanisms and the existence of right-handed
currents. Within the parameter space allowed by CLEO, using the Left-Right
Symmetric Model as a guide, we perform a detailed search for specific
sub-regions which can lead to a reduction in both the $B$ semileptonic
branching fraction as well as the the average yield of charmed quarks in $B$
decay. The results provide a concrete realization of an earlier suggestion by
Voloshin but may lead to potential difficulties with certain penguin mediated
decay processes.

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The categories of this paper are: mtrl-th
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th