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Measurement of cross sections of exclusive e<sup>+</sup>e<sup>-</sup>->VP processes at s=10.58 GeV
Belle Collaboration,Belous, K.,Shapkin, M.,Adachi, I.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Bakich, A.M.,Balagura, V.,Barberio, E.,Bartel, W.,Bay, A.,Bischofberger, M.,Bondar, A.,Bozek, A.,Bracko, M. North-Holland Pub. Co 2009 Physics letters: B Vol.681 No.5
The cross sections for the reactions e<SUP>+</SUP>e<SUP>-</SUP>->φη, φη<SUP>'</SUP>, ρη, ρη<SUP>'</SUP> have been measured using a data sample of 516 fb<SUP>-1</SUP> collected with the Belle detector at the KEKB asymmetric-energy e<SUP>+</SUP>e<SUP>-</SUP> collider. The corresponding values of the cross sections are: 1.4+/-0.4+/-0.1 fb (φη), 5.3+/-1.1+/-0.4 fb (φη<SUP>'</SUP>), 3.1+/-0.5+/-0.1 fb (ρη) and 3.3+/-0.6+/-0.2 fb (ρη<SUP>'</SUP>). The energy dependence of the cross sections is presented using Belle measurements together with those of CLEO and BaBar.
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>
Observation of an alternative χc0(2P) candidate in e+e−→J/ψDD¯
Chilikin, K.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aulchenko, V.,Ayad, R.,Babu, V.,Badhrees, I.,Bakich, A. M.,Bansal, V.,Barberio, E.,Besson, D.,Bhardwaj, V.,Bhuyan, B.,Biswal, J.,Bobrov, A. American Physical Society 2017 Physical Review D Vol.95 No.11
<P>We perform a full amplitude analysis of the process e(+)e(-)-> J/psi D (D) over bar, where D refers to either D-0 or D+. A new charmoniumlike state X*(3860) that decays to D (D) over bar is observed with a significance of 6.5 sigma. Its mass is (3862(-32)(+26) (+40)(-13) )MeV= c(2), and its width is (201(-67) (+154)(-82) (+88)) MeV. The J(PC) = 0(++) hypothesis is favored over the 2(++) hypothesis at the level of 2.5s. The analysis is based on the 980 fb(-1) data sample collected by the Belle detector at the asymmetric-energy e(+)e(-)collider KEKB.</P>
Observation of excited Ωc charmed baryons in e+e− collisions
Yelton, J.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Aziz, T.,Babu, V.,Bakich, A. M.,Bansal, V.,Barberio, E.,Behera, P.,Berger, M.,Bhardwaj, V.,Bhuyan, B.,Biswal American Physical Society 2018 Physical Review D Vol.97 No.5
Production cross sections of hyperons and charmed baryons from e+e− annihilation near s=10.52 GeV
Niiyama, M.,Sumihama, M.,Nakano, T.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Badhrees, I.,Bakich, A. M.,Bansal, V.,Barberio, E.,Berger, M.,Bhardwaj, V. American Physical Society 2018 Physical Review D Vol.97 No.7
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.
Search for lepton-flavor-violating τ decays into a lepton and a vector meson
Belle Collaboration,Miyazaki, Y.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Bakich, A.M.,Balagura, V.,Barberio, E.,Bay, A.,Belous, K.,Bhardwaj, V.,Bischofberger, M.,Bondar, A.,Bozek, A.,Bracko, M.,Browder North-Holland Pub. Co 2011 Physics letters: B Vol.699 No.4
We search for lepton-flavor-violating τ->@?V<SUP>0</SUP> decays, where @? is an electron or muon and V<SUP>0</SUP> is one of the vector mesons ρ<SUP>0</SUP>, φ, ω, K<SUP>@?0</SUP> and K@?<SUP>@?0</SUP>. We use 854 fb<SUP>-1</SUP> of data collected with the Belle detector at the KEKB asymmetric-energy e<SUP>+</SUP>e<SUP>-</SUP> collider. No evidence for a signal is found in any decay mode, and we obtain 90% confidence level upper limits on the individual branching fractions in the range (1.2-8.4)x10<SUP>-8</SUP>8.
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.
Belle Collaboration,Vinokurova, A.,Kuzmin, A.,Eidelman, S.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Balagura, V.,Barberio, E.,Belous, K.,Bhardwaj, V.,Bondar, A.,Bozek, A.,Bracko, M.,Brodzic North-Holland Pub. Co 2011 Physics letters: B Vol.706 No.2
We report the results of a study of B<SUP>+/-</SUP>→K<SUP>+/-</SUP>η<SUB>c</SUB> and B<SUP>+/-</SUP>→K<SUP>+/-</SUP>η<SUB>c</SUB>(2S) decays followed by η<SUB>c</SUB> and η<SUB>c</SUB>(2S) decays to (K<SUB>S</SUB>Kπ)<SUP>0</SUP>. The results are obtained from a data sample containing 535 million BB@?-meson pairs collected by the Belle experiment at the KEKB e<SUP>+</SUP>e<SUP>-</SUP> collider. We measure the products of the branching fractions B(B<SUP>+/-</SUP>→K<SUP>+/-</SUP>η<SUB>c</SUB>)B(η<SUB>c</SUB>→K<SUB>S</SUB>K<SUP>+/-</SUP>π<SUP>@?</SUP>)=(26.7+/-1.4(stat)<SUB>-2.6</SUB><SUP>+2.9</SUP>(syst)+/-4.9(model))x10<SUP>-6</SUP> and B(B<SUP>+/-</SUP>→K<SUP>+/-</SUP>η<SUB>c</SUB>(2S))B(η<SUB>c</SUB>(2S)→K<SUB>S</SUB>K<SUP>+/-</SUP>π<SUP>@?</SUP>)=(3.4<SUB>-1.5</SUB><SUP>+2.2</SUP>(stat+model)<SUB>-0.4</SUB><SUP>+0.5</SUP>(syst))x10<SUP>-6</SUP>. Interference with the non-resonant component leads to significant model uncertainty in the measurement of these product branching fractions. Our analysis accounts for this interference and allows the model uncertainty to be reduced. We also obtain the following charmonia masses and widths: M(η<SUB>c</SUB>)=(2985.4+/-1.5(stat)<SUB>-2.0</SUB><SUP>+0.5</SUP>(syst)) MeV/c<SUP>2</SUP>, Γ(η<SUB>c</SUB>)=(35.1+/-3.1(stat)<SUB>-1.6</SUB><SUP>+1.0</SUP>(syst)) MeV/c<SUP>2</SUP>, M(η<SUB>c</SUB>(2S))=(3636.1<SUB>-4.2</SUB><SUP>+3.9</SUP>(stat+model)<SUB>-2.0</SUB><SUP>+0.7</SUP>(syst)) MeV/c<SUP>2</SUP>, Γ(η<SUB>c</SUB>(2S))=(6.6<SUB>-5.1</SUB><SUP>+8.4</SUP>(stat+model)<SUB>-0.9</SUB><SUP>+2.6</SUP>(syst)) MeV/c<SUP>2</SUP>.
Search for lepton flavor violating τ decays into three leptons
Belle Collaboration,Miyazaki, Y.,Adachi, I.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Balagura, V.,Barberio, E.,Bay, A.,Bitenc, U.,Bondar, A.,Bozek, A.,Bracko, M.,Browder, T.E.,Ch North-Holland Pub. Co 2008 Physics letters: B Vol.660 No.3
We search for lepton flavor violating τ decays into three leptons (electron or muon) using 535 fb<SUP>-1</SUP> of data collected with the Belle detector at the KEKB asymmetric-energy e<SUP>+</SUP>e<SUP>-</SUP> collider. No evidence for these decays is observed, and we set 90% confidence level upper limits on the branching fractions of (2.0-4.1)x10<SUP>-8</SUP>. These results improve upon our previously published upper limits by factors of 4.9 to 10.