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Wang, M.-Z.,Abe, K.,Abe, K.,Aihara, H.,Asano, Y.,Aulchenko, V.,Aushev, T.,Bahinipati, S.,Bakich, A.M.,Bedny, I.,Bitenc, U.,Bizjak, I.,Bozek, A.,Brad,ko, M.,Brodzicka, J.,Browder, T.E.,Chang, M.-C Elsevier 2005 Physics letters: B Vol.617 No.3
<P><B>Abstract</B></P><P>The angular distributions of the baryon–antibaryon low-mass enhancements seen in the charmless three-body baryonic <I>B</I> decays <SUP>B+</SUP>→pp¯<SUP>K+</SUP>, <SUP>B0</SUP>→pp¯KS0 and <SUP>B0</SUP>→pΛ¯<SUP>π−</SUP> are reported. A quark fragmentation interpretation is supported, while the gluonic resonance picture is disfavored. Searches for the <SUP>Θ+</SUP> and <SUP>Θ++</SUP> pentaquarks in the relevant decay modes and possible glueball states G with 2.2 GeV/<SUP>c2</SUP><<SUB>Mpp¯</SUB><2.4 GeV/<SUP>c2</SUP> in the pp¯ systems give null results. We set upper limits on the products of branching fractions, B(<SUP>B0</SUP>→<SUP>Θ+</SUP>p¯)B(<SUP>Θ+</SUP>→pKS0)<2.3×<SUP>10−7</SUP>, B(<SUP>B+</SUP>→<SUP>Θ++</SUP>p¯)B(<SUP>Θ++</SUP>→p<SUP>K+</SUP>)<9.1×<SUP>10−8</SUP>, and B(<SUP>B+</SUP>→G<SUP>K+</SUP>)B(G→pp¯)<4.1×<SUP>10−7</SUP> at the 90% confidence level. The analysis is based on a 140 fb<SUP>−1</SUP> data sample recorded on the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric energy <SUP>e+</SUP><SUP>e−</SUP> collider.</P>
Miyazaki, Y.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Balagura, V.,Barberio, E.,Bay, A.,Belous, K.,Bhardwaj, V.,Bischofberger, M.,Bondar, A.,Brad,ko, M.,Browder, T.E.,Chang, North-Holland Pub. Co 2010 Physics letters. Section B Vol.682 No.4
<P><B>Abstract</B></P><P>We search for lepton flavor and lepton number violating <I>τ</I> decays into a lepton (ℓ=electron or muon) and two charged mesons (h,<SUP>h′</SUP>=<SUP>π±</SUP> or <SUP>K±</SUP>), <SUP>τ−</SUP>→<SUP>ℓ−</SUP><SUP>h+</SUP><SUP>h′−</SUP> and <SUP>τ−</SUP>→<SUP>ℓ+</SUP><SUP>h−</SUP><SUP>h′−</SUP>, 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. We obtain 90% C.L. upper limits on the branching fractions in the range (4.4–8.8)×<SUP>10−8</SUP> for τ→eh<SUP>h′</SUP>, and (3.3–16)×<SUP>10−8</SUP> for τ→μh<SUP>h′</SUP> processes. These results improve upon previously published upper limits by factors between 1.6 to 8.8.</P>
Search for a dark vector gauge boson decaying toπ+π−usingη→π+π−γdecays
Won, E.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aushev, T.,Ayad, R.,Badhrees, I.,Bakich, A. M.,Bansal, V.,Barberio, E.,Behera, P.,Bhuyan, B.,Biswal, J.,Bobrov, A.,Bozek, A.,Brad,ko, M., American Physical Society 2016 Physical Review D Vol.94 No.9
<P>We report a search for a dark vector gauge boson U' that couples to quarks in the decay chain D*(+) -> D-0 pi(+), D-0 -> K-S(0) eta, eta -> U'gamma, U' -> pi(+)pi- No signal is found and we set a mass-dependent limit on the baryonic fine structure constant of 10(-3)-10(-2) in the U' mass range of 290 to 520 MeV/c(2). This analysis is based on a data sample of 976 fb(-1) collected by the Belle experiment at the KEKB asymmetric-energy e(+)e(-) collider.</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.,Brad,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 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.,Brad,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>
Measurement of Inclusive RadiativeB-Meson Decays with a Photon Energy Threshold of 1.7 GeV
Limosani, A.,Aihara, H.,Arinstein, K.,Aushev, T.,Bakich, A. M.,Balagura, V.,Barberio, E.,Bay, A.,Belous, K.,Bischofberger, M.,Bondar, A.,Bozek, A.,Brad,ko, M.,Browder, T. E.,Chang, P.,Chao, Y.,Ch American Physical Society 2009 Physical Review Letters Vol.103 No.24
<P>Using 605 fb(-1) of data collected at the Upsilon(4S) resonance we present a measurement of the inclusive radiative B-meson decay channel, B-->X(s)gamma. For the lower photon energy thresholds of 1.7, 1.8, 1.9, and 2.0 GeV, as defined in the rest frame of the B meson, we measure the partial branching fraction and the mean and variance of the photon energy spectrum. At the 1.7 GeV threshold we obtain the partial branching fraction BF(B-->X(s)}gamma)=(3.45+/-0.15+/-0.40)x10(-4), where the errors are statistical and systematic.</P>
Observation ofB0→pp¯K*0with a LargeK*0Polarization
Chen, J.-H.,Wang, M.-Z.,Adachi, I.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A. M.,Balagura, V.,Barberio, E.,Bay, A.,Bedny, I.,Belous, K.,Bitenc, U.,Bondar, A.,Bozek, A.,Brad,ko, American Physical Society 2008 Physical review letters Vol.100 No.25
<P>Using a 492 fb{-1} data sample collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{+}e{-} collider, we observe the decay B{0}-->ppK*0 with a branching fraction of (1.18{-0.25}{+0.29}(stat)+/-0.11(syst))x10{-6}. We study the decay dynamics of B{0}-->ppK*0 and compare with B{+}-->ppK*+. The K*0 meson is found to be almost 100% polarized (with a fraction of (101+/-13+/-3)% in the helicity zero state), while the K*+ meson has a (32+/-17+/-9)% fraction in the helicity zero state. The direct CP asymmetries for B{0}-->ppK*0 and B{+}-->ppK*+ are measured to be -0.08+/-0.20+/-0.02 and -0.01+/-0.19+/-0.02, respectively. In addition, we report improved measurements of the branching fractions B(B{+}-->ppK*+)=(3.38{-0.60}{+0.73}+/-0.39)x10{-6} and B(B{0}-->ppK{0})=(2.51{-0.29}{+0.35}+/-0.21)x10{-6}, which supersede our previous measurements.</P>
Study of Ωc0 and Ωc∗0 baryons at Belle
Solovieva, E.,Chistov, R.,Adachi, I.,Aihara, H.,Arinstein, K.,Aushev, T.,Bakich, A.M.,Balagura, V.,Bitenc, U.,Bondar, A.,Brad,ko, M.,Brodzicka, J.,Browder, T.E.,Chang, P.,Chen, A.,Cheon, B.G.,Cho Elsevier 2009 Physics letters: B Vol.672 No.1
<P><B>Abstract</B></P><P>We report results from a study of the charmed double strange baryons Ωc0 and Ωc∗0 at Belle. The Ωc0 is reconstructed using the Ωc0→<SUP>Ω−</SUP><SUP>π+</SUP> decay mode, and its mass is measured to be (2693.6±0.3−1.5+1.8) MeV/<SUP>c2</SUP>. The Ωc∗0 baryon is reconstructed in the Ωc0γ mode. The mass difference <SUB>MΩc∗0</SUB>−<SUB>MΩc0</SUB> is measured to be (70.7±0.9−0.9+0.1) MeV/<SUP>c2</SUP>. The analysis is performed using 673 fb<SUP>−1</SUP> of data on and near the ϒ(4S) collected with the Belle detector at the KEKB asymmetric-energy <SUP>e+</SUP><SUP>e−</SUP> collider.</P>
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.,Brad,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>
Lai, Y.-T.,Wang, M.-Z.,Adachi, I.,Aihara, H.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Bakich, A. M.,Bala, A.,Bhuyan, B.,Bobrov, A.,Bozek, A.,Brad,ko, M.,Browder, T. E.,Chang, P.,Chekelian, V.,Chen, American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.5
<P>We search for the charmless B-o decay with final state particles p (Lambda) over bar pi(-)gamma using the full data sample that contains 772 x 10(6)B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. This decay is predicted to proceed predominantly via the b -> s gamma radiative penguin process with a high energy photon. No significant signal is found. We set an upper limit of 6.5 x 10(-7) for the branching fraction of B-o -> p (Lambda) over bar pi(-)gamma at the 90% confidence level.</P>