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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.,Brax10d,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>
Chang, P.,Abe, K.,Abe, K.,Abe, T.,Aihara, H.,Asano, Y.,Aulchenko, V.,Aushev, T.,Aziz, T.,Bahinipati, S.,Bakich, A.M.,Ban, Y.,Bay, A.,Bedny, I.,Bitenc, U.,Bizjak, I.,Bondar, A.,Bozek, A.,Brax10d,ko, Elsevier 2004 Physics letters: B Vol.599 No.3
<P><B>Abstract</B></P><P>We report the observation of <SUP>B0</SUP> decays to the <SUP>K+</SUP><SUP>π−</SUP><SUP>π0</SUP> final state using a data sample of 78 fb<SUP>−1</SUP> collected by the Belle detector at the KEKB <SUP>e+</SUP><SUP>e−</SUP> collider. With no assumptions about intermediate states in the decay, the branching fraction is measured to be (36.6−4.3+4.2±3.0)×<SUP>10−6</SUP>. We also search for <I>B</I> decays to intermediate two-body states with the same <SUP>K+</SUP><SUP>π−</SUP><SUP>π0</SUP> final state. Significant <I>B</I> signals are observed in the ρ<SUP>(770)−</SUP><SUP>K+</SUP> and <SUP>K*</SUP><SUP>(892)+</SUP><SUP>π−</SUP> channels, with branching fractions of (15.1−3.3−1.5−2.1+3.4+1.4+2.0)×<SUP>10−6</SUP> and (14.8−4.4−1.0−0.9+4.6+1.5+2.4)×<SUP>10−6</SUP>, respectively. The first error is statistical, the second is systematic and the third is due to the largest possible interference. Contributions from other possible two-body states will be discussed. No <I>CP</I> asymmetry is found in the inclusive <SUP>K+</SUP><SUP>π−</SUP><SUP>π0</SUP> or <SUP>ρ−</SUP><SUP>K+</SUP> modes, and we set 90% confidence level bounds on the asymmetry of −0.12<<SUB>ACP</SUB><0.26 and −0.18<<SUB>ACP</SUB><0.64, respectively.</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.,Brax10d,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>
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.,Brax10d,ko, M.,x 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>
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.,Brax10d,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>
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.,Brax10d,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>
Wang, M.-Z.,Abe, K.,Abe, K.,Abe, T.,Adachi, I.,Aihara, H.,Asano, Y.,Aso, T.,Aulchenko, V.,Aushev, T.,Bakich, A. M.,Bay, A.,Bizjak, I.,Bondar, A.,Bozek, A.,Brax10d,ko, M.,Browder, T. E.,Chang, M.-C. American Physical Society 2004 Physical Review Letters Vol.92 No.13
<P>We report the first observation of a b-->u type charmless baryonic B decay, B+-->pppi(+), as well as b-->s type B0-->ppK0 and B+-->ppK(*+) decays. The analysis is based on a 78 fb(-1) data sample recorded on the Upsilon(4S) resonance with the Belle detector at KEKB. We find B(B+-->pppi(+))=(3.06(+0.73)(-0.62)+/-0.37)x10(-6), B(B0-->ppK0)=(1.88(+0.77)(-0.60)+/-0.23)x10(-6), and B(B+-->ppK(*+))=(10.3(+3.6+1.3)(-2.8-1.7))x10(-6). We also update B(B+-->ppK+)=(5.66(+0.67)(-0.57)+/-0.62)x10(-6) and present an upper limit on B(B0-->ppK(*0)) at the 90% confidence level. A common feature of the observed decay modes is threshold peaking in baryon pair invariant mass.</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.,Brax10d,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>
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.,Brax10d,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>
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.,Brax10d,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>