Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on heavy Z' couplings from \Delta S = 2 B^- -> K^- K^- \pi^+
  decay   The heavy Z' boson with family nonuniversal couplings can introduce flavour
changing effects. Constraints on nondiagonal Z' couplings coming from the \mu-e
conversion in a muonic atom, K^0 - \bar{K^0} and B - \bar{B} mixing, epsilon
and epsilon'/ \epsilon CP- violating coefficients have been already
established. By using the OPAL upper bound of the branching ratio for the B^-
-> K^- K^- \pi^+ decay, we indicate additional constraints on the Z' couplings.
We comment also on the constraints of Z' couplings coming from the b->d d
\bar{s} transition. The constraint obtained here from the upper bound of the
B^- -> K^- K^- \pi^+ decay involves a different combination of couplings than
those previously presented, but is much weaker.

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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con