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Belle II silicon vertex detector
Belle II-SVD Collaboration,Adamczyk, K.,Aihara, H.,Angelini, C.,Aziz, T.,Babu, V.,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, Ti.,Baroncelli, To.,Basith, A.K.,Batignani, G.,Bauer, A.,Behera, P. North-Holland 2016 Nuclear Instruments & Methods in Physics Research. Vol.831 No.-
The Belle II experiment at the SuperKEKB collider in Japan is designed to indirectly probe new physics using approximately 50 times the data recorded by its predecessor. An accurate determination of the decay-point position of subatomic particles such as beauty and charm hadrons as well as a precise measurement of low-momentum charged particles will play a key role in this pursuit. These will be accomplished by an inner tracking device comprising two layers of pixelated silicon detector and four layers of silicon vertex detector based on double-sided microstrip sensors. We describe herein the design, prototyping and construction efforts of the Belle-II silicon vertex detector.
A bonding study toward the quality assurance of Belle-II silicon vertex detector modules
Belle-II SVD Collaboration,Kang, K.H.,Jeon, H.B.,Park, H.,Uozumi, S.,Adamczyk, K.,Aihara, H.,Angelini, C.,Aziz, T.,Babu, V.,Bacher, S.,Bahinipati, S.,Barberio, E.,Baroncelli, T.,Basith, A.K.,Batignani North-Holland 2016 Nuclear instruments & methods in physics research. Vol.831 No.-
A silicon vertex detector (SVD) for the Belle-II experiment comprises four layers of double-sided silicon strip detectors (DSSDs), assembled in a ladder-like structure. Each ladder module of the outermost SVD layer has four rectangular and one trapezoidal DSSDs supported by two carbon-fiber ribs. In order to achieve a good signal-to-noise ratio and minimize material budget, a novel chip-on-sensor ''Origami'' method has been employed for the three rectangular sensors that are sandwiched between the backward rectangular and forward (slanted) trapezoidal sensors. This paper describes the bonding procedures developed for making electrical connections between sensors and signal fan-out flex circuits (i.e., pitch adapters), and between pitch adapters and readout chips as well as the results in terms of the achieved bonding quality and pull force.
North-Holland Pub. Co 2016 Physics letters. Section B Vol.753 No.-
We report an improved measurement of D<SUP>0</SUP>-D@?<SUP>0</SUP> mixing and a search for CP violation in D<SUP>0</SUP> decays to CP-even final states K<SUP>+</SUP>K<SUP>-</SUP> and π<SUP>+</SUP>π<SUP>-</SUP>. The measurement is based on the final Belle data sample of 976 fb<SUP>-1</SUP>. The results are y<SUB>CP</SUB>=(1.11+/-0.22+/-0.09)% and A<SUB>Γ</SUB>=(-0.03+/-0.20+/-0.07)%, where the first uncertainty is statistical and the second is systematic.
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.
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.
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.
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.
Belle Collaboration,Hayasaka, K.,Inami, K.,Miyazaki, Y.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A.M.,Bay, A.,Belous, K.,Bhardwaj, V.,Bischofberger, M.,Bozek, A.,Brako, M.,Browder, T.E.,Chang, M North-Holland Pub. Co 2010 Physics letters: B Vol.687 No.2
<P>We present a search for lepton-flavor-violating tau decays into three leptons (electrons or muons) using 782 fb(-1) of data collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. No evidence for these decays is observed and we set 90% confidence level upper limits on the branching fractions between 1.5 x 10(-8) and 2.7 x 10(-8). (C) 2010 Elsevier B.V. All rights reserved.</P>
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>.