We report the first observation of a number of decay modes of the B meson, namely B-0-->D*-(5pi)(+), B+-->D*-(4pi)(++), and B+-->(D) over bar (*0)(5pi)(+), where (npi) implies the combination of n charged pions. The analysis is based on a 140 fb(-1) data sample collected at the Y(4S) resonance with the Belle detector at KEKB. We measure B[B-0-->D*-(5pi)(+)]=(4.72+/-0.59+/-0.71)x10(-3), B[B+-->D*-(4pi)(++)]=(2.56+/-0.26+/-0.33)x10(-3), and B[B+-->(D) over bar (*0)(5pi)(+)]=(5.67+/-0.91+/-0.85)x10(-3). We also provide improved measurements of the branching fractions for the decay modes B-0-->D*-(3pi)(+), B+-->(D) over bar (*0)(3pi)(+), and B-0-->(D) over bar (*0)(4pi)(0).

KEKB

Electron–positron annihilation

Bar (unit)

B meson

Branching fraction

Source

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Citations (0)

Study of Michel parameters in leptonic $\tau$ decays at Belle

A. Abdesselam Y. Chao S. Esen S. Vahsen H. Nakayama

Michel foucault

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Citations (3)

Search for the decayB0→γγ

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology (2006)

S. Villa K. Abe K. Abe I. Adachi H. Aihara

The rare decay B0→γγ is searched for in 104 fb−1 of data, corresponding to 111×106B¯¯¯B pairs, collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. No evidence for the signal is found, and an upper limit of 6.2×10−7 at 90% confidence level is set for the corresponding branching fraction.Received 12 January 2006DOI:https://doi.org/10.1103/PhysRevD.73.051107©2006 American Physical Society

KEKB

Branching fraction

10.1103/physrevd.73.051107

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Citations (11)

Properties of the X(3872) at Belle

Talk given at (2004)

Kazuo Abe Heyoung Yang Y. Chao D. Žontar D. Liventsev

X(3872)

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Citations (1)

COVID in Post Vaccinated individuals- Beacon of Light

medRxiv (Cold Spring Harbor Laboratory) (2021)

VK Sashindran K. Rajesh Ankur Nigam Sourya Sourabh Mohakuda Navin Bhati

Introduction COVISHIELD and COVAXIN have been introduced post rapid approval as COVID vaccines in India, which has the second most COVID cases across countries. These vaccines are being administered in a two-dose schedule from 16 Jan 2021. This study deals with the clinical profile of individuals who developed COVID infection post-COVID vaccination. This is the first study of similar nature in India. Methodology The study population comprised of individuals who were detected to be COVID positive 04 weeks post-vaccination and were compared with individuals detected positive within the first 04 weeks of vaccination. Data was collected in a digital questionnaire format and analyzed with SPSS v-23 software. Clinical features were profiled in detail. Chi-square analysis was done to find out the association of various demographic features with the severity of the disease. Results In the study population, fever was the commonest symptom (75.1%) followed by anosmia (72.1%), and shortness of breath (16.3%). There was a lower incidence of fever, cough, dyspnea, and requirement of hospitalization in the study population as compared to the control group and previous epidemiological data. The time required for complete recovery and disease severity was favorable in our study population. There was a significant correlation in the rate of hospitalization among the study group and the comparative group (p=0.0001) and between the number of dosage of COVID vaccine with the lowest SpO2 recorded (p=0.001). Conclusion This study will boost the ongoing initiative of having a maximal vaccinated population countrywide and emphasize the need for two doses of vaccination.

Anosmia

Vaccination schedule

Population study

10.1101/2021.06.18.21258796

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Citations (1)

Studies ofCPViolation inB→J/ψK*Decays

Physical Review Letters (2005)

R. Itoh Y. Onuki K. Abe K. Abe I. Adachi

CP violation in B→J/ψK∗ decays is studied using an angular analysis in a data sample of 253 fb−1 recorded with the Belle detector at the KEKB e+e− collider. The flavor separated measurements of the decay amplitudes indicate no evidence for direct CP violation. T-odd CP violation is studied using the asymmetries in triple product correlations, and the results are consistent with the standard model null predictions. The time-dependent angular analysis gives the following values of CP-violating parameters: sin2ϕ1=0.24±0.31±0.05 and cos2ϕ1=0.56±0.79±0.11.Received 17 April 2005DOI:https://doi.org/10.1103/PhysRevLett.95.091601©2005 American Physical Society

KEKB

CP violation

Electron–positron annihilation

10.1103/physrevlett.95.091601

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Citations (64)

Belle II Technical Design Report

arXiv (Cornell University) (2010)

K. Abe Y. Chao S. Esen Z.P. Zhang T. Nakamura

The Belle detector at the KEKB electron-positron collider has collected almost 1 billion Y(4S) events in its decade of operation. Super-KEKB, an upgrade of KEKB is under construction, to increase the luminosity by two orders of magnitude during a three-year shutdown, with an ultimate goal of 8E35 /cm^2 /s luminosity. To exploit the increased luminosity, an upgrade of the Belle detector has been proposed. A new international collaboration Belle-II, is being formed. The Technical Design Report presents physics motivation, basic methods of the accelerator upgrade, as well as key improvements of the detector.

10.48550/arxiv.1011.0352

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Citations (467)

Observation of an Isotriplet of Excited Charmed Baryons Decaying toΛc+π

Physical Review Letters (2005)

R. Mizuk K. Abe K. Abe H. Aihara M. Akatsu

We report the observation of an isotriplet of excited charmed baryons, decaying into Lambda(+)(c)pi(-), Lambda(+)(c)pi(0), and Lambda(+)(c)pi(+). We measure the mass differences M(Lambda(+)(c)pi)-M(Lambda(+)(c)) and widths to be 515.4(+3.2+2.1)(-3.1-6.0) MeV/c(2), 61(+18+22)(-13-13) MeV for the neutral state; 505.4(+5.8+12.4)(-4.6-2.0) MeV/c(2), 62(+37+52)(-23-38) MeV for the charged state; and 514.5(+3.4+2.8)(-3.1-4.9) MeV/c(2), 75(+18+12)(-13-11) MeV for the doubly charged state, where the uncertainties are statistical and systematic, respectively. These results are obtained from a 281 fb(-1) data sample collected with the Belle detector near the Upsilon(4S) resonance, at the KEKB asymmetric energy e(+)e(-) collider.

KEKB

Charmed baryons

Electron–positron annihilation

10.1103/physrevlett.94.122002

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Citations (126)

Observation of theDsJ(2317)andDsJ(<…

Physical Review Letters (2003)

P. Krokovny K. Abe K. Abe K. Abe I. Adachi

We report the first observation of the B-->Dmacr;D(sJ)(2317) and B-->Dmacr;D(sJ)(2457) decays based on 123.8x10(6) BBmacr; events collected with the Belle detector at KEKB. We observe the D(sJ)(2317) decay to D(s)pi(0) and the D(sJ)(2457) decay to the D(*)(s)pi(0) and D(s)gamma final states. We also set 90% C.L. upper limits for the decays D(sJ)(2317)-->D(*)(s)gamma, D(sJ)(2457)-->D(*)(s)gamma, D(sJ)(2457)-->D(s)pi(0), and D(sJ)(2457)-->D(s)pi(+)pi(-).

KEKB

10.1103/physrevlett.91.262002

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Citations (258)