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Search for lepton-flavor-violating <i>τ</i> decay into a lepton and an <sub>f0</sub>(980) meson
Miyazaki, Y.,Adachi, I.,Aihara, H.,Arinstein, K.,Aushev, T.,Bakich, A.M.,Bay, A.,Bedny, I.,Bitenc, U.,Bondar, A.,Bozek, A.,Brač,ko, M.,Browder, T.E.,Chen, A.,Cheon, B.G.,Cho, I.-S.,Choi, Y.,Dalse Elsevier 2009 Physics letters: B Vol.672 No.4
<P><B>Abstract</B></P><P>We search for lepton-flavor-violating <I>τ</I> decays into a lepton (electron or muon) and an <SUB>f0</SUB>(980) meson using 671 fb<SUP>−1</SUP> of data collected with the Belle detector at the KEKB asymmetric-energy <SUP>e+</SUP><SUP>e−</SUP> collider. No events are observed and we set the following 90% C.L. upper limits on the branching fraction products: B(<SUP>τ−</SUP>→<SUP>e−</SUP><SUB>f0</SUB>(980))×B(<SUB>f0</SUB>(980)→<SUP>π+</SUP><SUP>π−</SUP>)<3.2×<SUP>10−8</SUP> and B(<SUP>τ−</SUP>→<SUP>μ−</SUP><SUB>f0</SUB>(980))×B(<SUB>f0</SUB>(980)→<SUP>π+</SUP><SUP>π−</SUP>)<3.4×<SUP>10−8</SUP>. This is the first search performed for these modes.</P>
Search for τ→eγ decay at Belle
Hayasaka, K.,Abe, K.,Abe, K.,Aihara, H.,Asano, Y.,Aushev, T.,Bahinipati, S.,Bakich, A.M.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,Bozek, A.,Brač,ko, M.,Brodzicka, J.,Browder, T.E.,Cha Elsevier 2005 Physics letters: B Vol.613 No.1
<P><B>Abstract</B></P><P>We have searched for the lepton-flavor-violating decay τ→eγ using a data sample of 86.7 fb<SUP>−1</SUP> collected with the Belle detector at the KEKB asymmetric <SUP>e+</SUP><SUP>e−</SUP> collider. No evidence for a signal is obtained, and we set an upper limit for the branching fraction B(τ→eγ)<3.9×<SUP>10−7</SUP> at the 90% C.L.</P>
Satoyama, N.,Abe, K.,Adachi, I.,Aihara, H.,Anipko, D.,Bakich, A.M.,Barberio, E.,Bedny, I.,Belous, K.,Bitenc, U.,Bizjak, I.,Bondar, A.,Bozek, A.,Brač,ko, M.,Browder, T.E.,Chang, M.-C.,Chang, P.,Ch Elsevier 2007 Physics letters: B Vol.647 No.2
<P><B>Abstract</B></P><P>We present a search for the decays <SUP>B+</SUP>→<SUP>μ+</SUP><SUB>νμ</SUB> and <SUP>B+</SUP>→<SUP>e+</SUP><SUB>νe</SUB> in a 253 fb<SUP>−1</SUP> data sample collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy <I>B</I> factory. We find no significant evidence for a signal and set 90% confidence level upper limits of B(<SUP>B+</SUP>→<SUP>μ+</SUP><SUB>νμ</SUB>)<1.7×<SUP>10−6</SUP> and B(<SUP>B+</SUP>→<SUP>e+</SUP><SUB>νe</SUB>)<9.8×<SUP>10−7</SUP>.</P>
Precise measurement of hadronic <i>τ</i>-decays with an <i>η</i> meson
Inami, K.,Ohshima, T.,Kaji, H.,Adachi, I.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bedny, I.,Bhardwaj, V.,Bondar, A.,Brač,ko, M.,Browder, T.E.,Chang, M.-C.,Chao, Y.,Chistov, R.,Cho, I.-S Elsevier 2009 Physics letters: B Vol.672 No.3
<P><B>Abstract</B></P><P>We have studied hadronic <I>τ</I> decay modes involving an <I>η</I> meson using 490 fb<SUP>−1</SUP> of data collected with the Belle detector at the KEKB asymmetric-energy <SUP>e+</SUP><SUP>e−</SUP> collider. The following branching fractions have been measured: B(<SUP>τ−</SUP>→<SUP>K−</SUP>η<SUB>ντ</SUB>)=(1.58±0.05±0.09)×<SUP>10−4</SUP>, B(<SUP>τ−</SUP>→<SUP>K−</SUP><SUP>π0</SUP>η<SUB>ντ</SUB>)=(4.6±1.1±0.4)×<SUP>10−5</SUP>, B(<SUP>τ−</SUP>→<SUP>π−</SUP><SUP>π0</SUP>η<SUB>ντ</SUB>)=(1.35±0.03±0.07)×<SUP>10−3</SUP>, B(<SUP>τ−</SUP>→<SUP>π−</SUP>KS0η<SUB>ντ</SUB>)=(4.4±0.7±0.2)×<SUP>10−5</SUP>, and B(<SUP>τ−</SUP>→<SUP>K∗−</SUP>η<SUB>ντ</SUB>)=(1.34±0.12±0.09)×<SUP>10−4</SUP>. These results are substantially more precise than previous measurements. The new measurements are compared with theoretical calculations based on the CVC hypothesis or the chiral perturbation theory. We also set upper limits on branching fractions for <I>τ</I> decays into <SUP>K−</SUP>KS0η<SUB>ντ</SUB>, <SUP>π−</SUP>KS0<SUP>π0</SUP>η<SUB>ντ</SUB>, <SUP>K−</SUP>ηη<SUB>ντ</SUB>, <SUP>π−</SUP>ηη<SUB>ντ</SUB> and non-resonant <SUP>K−</SUP><SUP>π0</SUP>η<SUB>ντ</SUB> final states.</P>
Search for resonant B<sup>+</sup>/-->K<sup>+</sup>/-h->K<sup>+</sup>/-γγ decays at Belle
Belle Collaboration,Wicht, J.,Adachi, I.,Aihara, H.,Anipko, D.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Barberio, E.,Bedny, I.,Bitenc, U.,Bizjak, I.,Bondar, A.,Bozek, A.,Bracko, M.,Brodzicka, J.,Browder, North-Holland Pub. Co 2008 Physics letters: B Vol.662 No.4
We report measurements and searches for resonant B<SUP>+</SUP>/-->K<SUP>+</SUP>/-h->K<SUP>+</SUP>/-γγ decays where h is a η, η<SUP>'</SUP>, η<SUB>c</SUB>, η<SUB>c</SUB>(2S), χ<SUB>c0</SUB>, χ<SUB>c2</SUB>, J/ψ meson or the X(3872) particle. The results are based on a data sample containing 535 million BB@? pairs collected with the Belle detector at the KEKB e<SUP>+</SUP>e<SUP>-</SUP> asymmetric-energy collider operating at the @?(4S) resonance. Signals are observed in the modes with η and η<SUP>'</SUP>, and we obtain evidence for a signal in the mode with η<SUB>c</SUB>. We measure B(B<SUP>+</SUP>/-->K<SUP>+</SUP>/-η->K<SUP>+</SUP>/-γγ)=(0.87<SUB>-0.15</SUB><SUP>+0.16</SUP>(stat)<SUB>-0.07</SUB><SUP>+0.10</SUP>(syst))x10<SUP>-6</SUP>, B(B<SUP>+</SUP>/-->K<SUP>+</SUP>/-η<SUP>'</SUP>->K<SUP>+</SUP>/-γγ)=(1.40<SUB>-0.15</SUB><SUP>+0.16</SUP>(stat)<SUB>-0.12</SUB><SUP>+0.15</SUP>(syst))x10<SUP>-6</SUP> and B(B<SUP>+</SUP>/-->K<SUP>+</SUP>/-η<SUB>c</SUB>->K<SUP>+</SUP>/-γγ)=(0.22<SUB>-0.07</SUB><SUP>+0.09</SUP>(stat)<SUB>-0.02</SUB><SUP>+0.04</SUP>(syst))x10<SUP>-6</SUP>. We set upper limits on the branching fractions of the other modes.
Belle Collaboration,Chen, W.T.,Abe, K.,Abe, K.,Adachi, I.,Aihara, H.,Anipko, D.,Aulchenko, V.,Bakich, A.M.,Barberio, E.,Bay, A.,Bedny, I.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,Bozek, A.,Bracko, M North-Holland Pub. Co 2007 Physics letters: B Vol.651 No.1
K<SUB>S</SUB><SUP>0</SUP>K<SUB>S</SUB><SUP>0</SUP> production in two-photon collisions has been studied using a 397.6 fb<SUP>-1</SUP> data sample collected with the Belle detector at the KEKB e<SUP>+</SUP>e<SUP>-</SUP> collider. For the first time the cross sections are measured in the two-photon center-of-mass energy range between 2.4 GeV and 4.0 GeV and angular range |cosθ<SUP>*</SUP>|<0.6. Combining the results with measurements of γγ->K<SUP>+</SUP>K<SUP>-</SUP> from Belle, we observe that the cross section ratio σ(K<SUB>S</SUB><SUP>0</SUP>K<SUB>S</SUB><SUP>0</SUP>)/σ(K<SUP>+</SUP>K<SUP>-</SUP>) decreases from ∼0.13 to ∼0.01 with increasing energy. Signals for the χ<SUB>c0</SUB> and χ<SUB>c2</SUB> charmonium states are also observed.
Search for lepton flavor violating <sup>τ−</sup> decays with a KS0 meson
Miyazaki, Y.,Abe, K.,Abe, K.,Aihara, H.,Anipko, D.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Barbero, M.,Bedny, I.,Belous, K.,Bitenc, U.,Bizjak, I.,Blyth, S.,Bondar, A.,Bozek, A.,Brač,k Elsevier 2006 Physics letters: B Vol.639 No.3
<P><B>Abstract</B></P><P>We have searched for the lepton flavor violating decays <SUP>τ−</SUP>→<SUP>ℓ−</SUP>KS0 (ℓ=e or <I>μ</I>), using a data sample of 281 fb<SUP>−1</SUP> collected with the Belle detector at the KEKB <SUP>e+</SUP><SUP>e−</SUP> asymmetric-energy collider. No evidence for a signal was found in either of the decay modes, and we set the following upper limits for the branching fractions: B(<SUP>τ−</SUP>→<SUP>e−</SUP>KS0)<5.6×<SUP>10−8</SUP> and B(<SUP>τ−</SUP>→<SUP>μ−</SUP>KS0)<4.9×<SUP>10−8</SUP> at the 90% confidence level. These results improve the previously published limits set by the CLEO Collaboration by factors of 16 and 19, respectively.</P>
Belle Collaboration,Hokuue, T.,Abe, K.,Abe, K.,Adachi, I.,Aihara, H.,Asano, Y.,Aushev, T.,Bakich, A.M.,Balagura, V.,Barberio, E.,Barbero, M.,Bay, A.,Bedny, I.,Belous, K.,Bitenc, U.,Bizjak, I.,Blyth, S North-Holland Pub. Co 2007 Physics letters: B Vol.648 No.2
We report measurements of the charmless semileptonic decays B<SUP>0</SUP>->π<SUP>-</SUP>/ρ<SUP>-</SUP>@?<SUP>+</SUP>ν and B<SUP>+</SUP>->π<SUP>0</SUP>/ρ<SUP>0</SUP>@?<SUP>+</SUP>ν, based on a sample of 2.75x10<SUP>8</SUP>BB@? events collected at the @?(4S) resonance with the Belle detector at the KEKB e<SUP>+</SUP>e<SUP>-</SUP> asymmetric collider. In this analysis, the accompanying B meson is reconstructed in the semileptonic mode B->D<SUP>(*)</SUP>@?ν, enabling detection of the signal modes with high purity. We measure the branching fractions B(B<SUP>0</SUP>->π<SUP>-</SUP>@?<SUP>+</SUP>ν)=(1.38+/-0.19+/-0.14+/-0.03)x10<SUP>-4</SUP>, B(B<SUP>0</SUP>->ρ<SUP>-</SUP>@?<SUP>+</SUP>ν)=(2.17+/-0.54+/-0.31+/-0.08)x10<SUP>-4</SUP>, B(B<SUP>+</SUP>->π<SUP>0</SUP>@?<SUP>+</SUP>ν)=(0.77+/-0.14+/-0.08+/-0.00)x10<SUP>-4</SUP> and B(B<SUP>+</SUP>->ρ<SUP>0</SUP>@?<SUP>+</SUP>ν)=(1.33+/-0.23+/-0.17+/-0.05)x10<SUP>-4</SUP>, where the errors are statistical, experimental systematic, and systematic due to form factor uncertainties, respectively. For each mode we also present the partial branching fractions in three q<SUP>2</SUP> intervals: q<SUP>2</SUP><8, 8=<q<SUP>2</SUP><16, and q<SUP>2</SUP>>=16 GeV<SUP>2</SUP>/c<SUP>2</SUP>. From our partial branching fractions for B->π@?ν and recent results for the form factor from unquenched Lattice QCD calculations, we obtain values of the CKM matrix element |V<SUB>ub</SUB>|.
Belle Collaboration,Miyazaki, Y.,Adachi, I.,Aihara, H.,Anipko, D.,Arinstein, K.,Aulchenko, V.,Aziz, T.,Bakich, A.M.,Barberio, E.,Bay, A.,Bedny, I.,Belous, K.,Bitenc, U.,Bizjak, I.,Bondar, A.,Bracko, M North-Holland Pub. Co 2007 Physics letters: B Vol.648 No.5
We have searched for lepton-flavor-violating τ decays with a pseudoscalar meson (η, η<SUP>'</SUP> and π<SUP>0</SUP>) using a data sample of 401 fb<SUP>-1</SUP> collected with the Belle detector at the KEKB asymmetric-energy e<SUP>+</SUP>e<SUP>-</SUP> collider. No evidence for these decays is found and we set the following upper limits on the branching fractions: B(τ<SUP>-</SUP>->e<SUP>-</SUP>η)<9.2x10<SUP>-8</SUP>, B(τ<SUP>-</SUP>->μ<SUP>-</SUP>η)<6.5x10<SUP>-8</SUP>, B(τ<SUP>-</SUP>->e<SUP>-</SUP>η<SUP>'</SUP>)<1.6x10<SUP>-7</SUP>, B(τ<SUP>-</SUP>->μ<SUP>-</SUP>η<SUP>'</SUP>)<1.3x10<SUP>-7</SUP>, B(τ<SUP>-</SUP>->e<SUP>-</SUP>π<SUP>0</SUP>)<8.0x10<SUP>-8</SUP> and B(τ<SUP>-</SUP>->μ<SUP>-</SUP>π<SUP>0</SUP>)<1.2x10<SUP>-7</SUP> at the 90% confidence level. These results improve our previously published upper limits by factors from 2.3 to 6.3.