Search for the Decays ${B^0_{(s)}\to e^+\mu^-}$ and ${B^0_{(s)}\to e^+e^-}$ in CDF Run II - Archive ouverte HAL Access content directly
Journal Articles Physical Review Letters Year : 2009

Search for the Decays ${B^0_{(s)}\to e^+\mu^-}$ and ${B^0_{(s)}\to e^+e^-}$ in CDF Run II

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C. Vellidis
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M. Vidal
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Roland Vidal
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I. Vila
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R. Vilar
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T. Vine
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M. Vogel
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I. Volobouevt
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G. Volpiz
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P. Wagner
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R.G. Wagner
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R.L. Wagner
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W. Wagnerw
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J. Wagner-Kuhr
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T. Wakisaka
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R. Wallny
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S.M. Wang
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A. Warburton
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D. Waters
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M. Weinberger
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J. Weinelt
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H. Wenzel
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W.C. Wester Iii
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B. Whitehouse
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D. Whitesonf
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A.B. Wicklund
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E. Wicklund
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S. Wilbur
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G. Williams
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H.H. Williams
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P. Wilson
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B.L. Winer
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P. Wittichh
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S. Wolbers
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C. Wolfe
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T. Wright
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F. W¨urthwein
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S. Xie
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A. Yagil
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K. Yamamoto
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J. Yamaoka
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U.K. Yangp
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W.M. Yao
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A. Zanetti
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X. Zhang
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Y. Zhengd
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Abstract

We report results from a search for the lepton flavor violating decays $B^0_{(s)}\to e^+\mu^-$, and the flavor-changing neutral-current decays $B^0_{(s)} \to e^+ e^-$. The analysis uses data corresponding to ${\rm 2 fb^{-1}}$ of integrated luminosity of $p \bar{p}$ collisions at $\sqrt{s}=1.96 {\rm TeV}$ collected with the upgraded Collider Detector (CDF II) at the Fermilab Tevatron. The observed number of $B^0_{(s)}$ candidates is consistent with background expectations. The resulting Bayesian upper limits on the branching ratios at 90% credibility level are $\mathcal{B}(B^0_s \to e^{+}\mu^{-}) < 2.0 \times 10^{-7}$, $\mathcal{B}(B^0 \to e^{+}\mu^{-})< 6.4 \times 10^{-8}$, $\mathcal{B}(B^0_s \to e^{+}\mu^{-}) < 2.0 \times 10^{-7}$ and $\mathcal{B}(B^0 \to e^{+}\mu^{-})< 6.4 \times 10^{-8}$. From the limits on $\mathcal{B} (B^0_{(s)}\to e^+\mu^-)$, the following lower bounds on the Pati-Salam leptoquark masses are also derived: ${M_{LQ}}(B^0_s\to e^+ \mu^-) > 47.8 {\rm TeV/c^2}$, and ${M_{LQ}}(B^0\to e^+ \mu^-) > 59.3 {\rm TeV/c^2}$, at 90% credibility level.

Dates and versions

in2p3-00356269 , version 1 (27-01-2009)

Identifiers

Cite

T. Aaltonen, J. Adelman, T. Akimoto, B. Alvarez Gonzalez, S. Amerioy, et al.. Search for the Decays ${B^0_{(s)}\to e^+\mu^-}$ and ${B^0_{(s)}\to e^+e^-}$ in CDF Run II. Physical Review Letters, 2009, 102, pp.201801. ⟨10.1103/PhysRevLett.102.201801⟩. ⟨in2p3-00356269⟩
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