TY - JOUR
T1 - Search for the Decays B0(s) ---> e+ mu- and B0(s) ---> e+ e- in CDF Run II
AU - CDF Collaboration
AU - Martin, Victoria
N1 - FERMILAB-PUB-09-021-E, Article Number 201801
PY - 2009
Y1 - 2009
N2 - 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.
AB - 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.
KW - hep-ex
U2 - 10.1103/PhysRevLett.102.201801
DO - 10.1103/PhysRevLett.102.201801
M3 - Article
SN - 1079-7114
VL - 102
JO - Physical Review Letters
JF - Physical Review Letters
ER -