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0000-0002-8880-6134
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University of Petroleum and Energy Studies
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Publisher: American Physical Society (APS)
Date: 25-10-2023
Publisher: American Physical Society (APS)
Date: 25-04-2022
Publisher: American Physical Society (APS)
Date: 28-04-2023
Publisher: Springer Science and Business Media LLC
Date: 03-2022
Abstract: We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay $$ {\\Lambda}_c^{+} $$ Λ c + → pη ′ with η ′ → ηπ + π − , using a data s le corresponding to an integrated luminosity of 981 fb − 1 , collected by the Belle detector at the KEKB e + e − asymmetric-energy collider. A significant $$ {\\Lambda}_c^{+} $$ Λ c + → pη ′ signal is observed for the first time with a signal significance of 5.4 σ . The relative branching fraction with respect to the normalization mode $$ {\\Lambda}_c^{+} $$ Λ c + → pK − π + is measured to be $$ \\frac{\\mathcal{B}\\left({\\Lambda}_c^{+}\\to p\\eta^{\\prime}\\right)}{\\mathcal{B}\\left({\\Lambda}_c^{+}\\to {pK}^{-}{\\pi}^{+}\\right)}=\\left(7.54\\pm 1.32\\pm 0.73\\right)\\times {10}^{-3}, $$ B Λ c + → pη ′ B Λ c + → pK − π + = 7.54 ± 1.32 ± 0.73 × 10 − 3 , where the uncertainties are statistical and systematic, respectively. Using the world-average value of $$ \\mathcal{B}\\left({\\Lambda}_c^{+}\\to {pK}^{-}{\\pi}^{+}\\right) $$ B Λ c + → pK − π + = (6 . 28 ± 0 . 32) × 10 − 2 , we obtain $$ \\mathcal{B}\\left({\\Lambda}_c^{+}\\to p\\eta^{\\prime}\\right)=\\left(4.73\\pm 0.82\\pm 0.46\\pm 0.24\\right)\\times {10}^{-4}, $$ B Λ c + → pη ′ = 4.73 ± 0.82 ± 0.46 ± 0.24 × 10 − 4 , where the uncertainties are statistical, systematic, and from $$ \\mathcal{B}\\left({\\Lambda}_c^{+}\\to {pK}^{-}{\\pi}^{+}\\right) $$ B Λ c + → pK − π + , respectively.
Publisher: Springer Science and Business Media LLC
Date: 10-2021
Abstract: Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ ± → ℓ ± γ ( ℓ = e, μ ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ ± → ℓ ± γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb − 1 , is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, $$ \\mathcal{B} $$ B ( τ ± → μ ± γ ) ≤ 4 . 2 × 10 − 8 and $$ \\mathcal{B} $$ B ( τ ± → e ± γ ) ≤ 5 . 6 × 10 − 8 , are set at 90% confidence level.
Publisher: American Physical Society (APS)
Date: 18-01-2019
Publisher: American Physical Society (APS)
Date: 17-09-2021
Publisher: American Physical Society (APS)
Date: 22-02-2023
Publisher: American Physical Society (APS)
Date: 25-01-2018
Publisher: American Physical Society (APS)
Date: 16-02-2023
Publisher: American Physical Society (APS)
Date: 29-01-2019
Publisher: American Physical Society (APS)
Date: 20-01-2023
Publisher: American Physical Society (APS)
Date: 21-02-2023
Publisher: American Physical Society (APS)
Date: 24-03-2011
Publisher: American Physical Society (APS)
Date: 14-03-2011
Publisher: Springer Science and Business Media LLC
Date: 03-2018
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 10-09-2021
Publisher: American Physical Society (APS)
Date: 09-03-2023
Publisher: American Physical Society (APS)
Date: 27-11-2019
Publisher: American Physical Society (APS)
Date: 13-05-2020
Publisher: American Physical Society (APS)
Date: 17-10-2023
Publisher: American Physical Society (APS)
Date: 08-09-2021
Publisher: American Physical Society (APS)
Date: 07-03-2023
Publisher: American Physical Society (APS)
Date: 08-05-2023
Publisher: American Physical Society (APS)
Date: 20-02-2019
Publisher: American Physical Society (APS)
Date: 15-03-2021
Publisher: Springer Science and Business Media LLC
Date: 06-2021
Abstract: We report the first measurement of the exclusive cross sections e + e − → $$ B\\overline{B} $$ B B ¯ , e + e − → $$ B{\\overline{B}}^{\\ast } $$ B B ¯ ∗ , and e + e − → $$ {B}^{\\ast }{\\overline{B}}^{\\ast } $$ B ∗ B ¯ ∗ in the energy range from 10 . 63 GeV to 11 . 02 GeV. The B mesons are fully reconstructed in a large number of hadronic final states and the three channels are identified using a beam-constrained-mass variable. The shapes of the exclusive cross sections show oscillatory behavior with several maxima and minima. The results are obtained using data collected by the Belle experiment at the KEKB asymmetric-energy e + e − collider.
Publisher: American Physical Society (APS)
Date: 12-04-2023
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 07-06-2023
Publisher: American Physical Society (APS)
Date: 17-02-2023
Publisher: American Physical Society (APS)
Date: 16-06-2021
Publisher: arXiv
Date: 2021
Publisher: American Physical Society (APS)
Date: 28-03-2023
Publisher: American Physical Society (APS)
Date: 08-08-2023
Publisher: Springer Science and Business Media LLC
Date: 02-2022
Abstract: We present a measurement of the Cabibbo-Kobayashi-Maskawa unitarity triangle angle ϕ 3 (also known as γ ) using a model-independent Dalitz plot analysis of B + → D ( $$ {K}_S^0 $$ K S 0 h + h − ) h + , where D is either a D 0 or $$ \\overline{D} $$ D ¯ 0 meson and h is either a π or K . This is the first measurement that simultaneously uses Belle and Belle II data, combining s les corresponding to integrated luminosities of 711 fb − 1 and 128 fb − 1 , respectively. All data were accumulated from energy-asymmetric e + e − collisions at a centre-of-mass energy corresponding to the mass of the Υ(4 S ) resonance. We measure ϕ 3 = (78 . 4 ± 11 . 4 ± 0 . 5 ± 1 . 0)°, where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is from the uncertainties on external measurements of the D -decay strong-phase parameters.
Publisher: American Physical Society (APS)
Date: 05-04-2023
Publisher: American Physical Society (APS)
Date: 30-11-2020
Publisher: American Physical Society (APS)
Date: 11-07-2023
Publisher: American Physical Society (APS)
Date: 27-06-2013
Publisher: American Physical Society (APS)
Date: 25-03-2020
Publisher: American Physical Society (APS)
Date: 14-04-2021
Publisher: American Physical Society (APS)
Date: 29-03-2021
Publisher: American Physical Society (APS)
Date: 21-02-2020
Publisher: American Physical Society (APS)
Date: 21-09-2023
Publisher: Springer Science and Business Media LLC
Date: 03-2021
Abstract: We present measurements of the branching fractions for the decays B → Kμ + μ − and B → Ke + e − , and their ratio ( R K ), using a data s le of 711 fb − 1 that contains 772 × 10 6 $$ B\\overline{B} $$ B B ¯ events. The data were collected at the ϒ(4 S ) resonance with the Belle detector at the KEKB asymmetric-energy e + e − collider. The ratio R K is measured in five bins of dilepton invariant-mass-squared ( q 2 ): q 2 ∈ (0 . 1 , 4 . 0) , (4 . 00 , 8 . 12) , (1 . 0 , 6 . 0), (10 . 2 , 12 . 8) and ( 14 . 18) GeV 2 /c 4 , along with the whole q 2 region. The R K value for q 2 ∈ (1 . 0 , 6 . 0) GeV 2 /c 4 is $$ {1.03}_{-0.24}^{+0.28} $$ 1.03 − 0.24 + 0.28 ± 0 . 01. The first and second uncertainties listed are statistical and systematic, respectively. All results for R K are consistent with Standard Model predictions. We also measure CP -averaged isospin asymmetries in the same q 2 bins. The results are consistent with a null asymmetry, with the largest difference of 2.6 standard deviations occurring for the q 2 ∈ (1 . 0 , 6 . 0) GeV 2 /c 4 bin in the mode with muon final states. The measured differential branching fractions, $$ d\\mathrm{\\mathcal{B}} $$ d ℬ /dq 2 , are consistent with theoretical predictions for charged B decays, while the corresponding values are below the expectations for neutral B decays. We have also searched for lepton-flavor-violating B → Kμ ± e ∓ decays and set 90% confidence-level upper limits on the branching fraction in the range of 10 − 8 for B + → K + μ ± e ∓ , and B 0 → K 0 μ ± e ∓ modes.
Publisher: American Physical Society (APS)
Date: 22-04-2021
Publisher: American Physical Society (APS)
Date: 23-02-2022
Publisher: Springer Science and Business Media LLC
Date: 02-2013
Abstract: We search for CP violation in the decay ${D^{+}}\\to K_S^0{K^{+}}$ using a data s le with an integrated luminosity of 977 fb −1 collected with the Belle detector at the KEKB e + e − asymmetric-energy collider. No CP violation has been observed and the CP asymmetry in ${D^{+}}\\to K_S^0{K^{+}}$ decay is measured to be (−0.25 ± 0.28 ± 0.14)%, which is the most sensitive measurement to date. After subtracting CP violation due to ${K^0}-{{\\overline{K}}^0}$ mixing, the CP asymmetry in ${D^{+}}\\to {{\\overline{K}}^0}{K^{+}}$ decay is found to be (+0.08 ± 0.28 ± 0.14)%.
Publisher: American Physical Society (APS)
Date: 12-2020
Publisher: American Physical Society (APS)
Date: 15-05-2023
Publisher: American Physical Society (APS)
Date: 09-03-2018
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 06-08-2018
Publisher: American Physical Society (APS)
Date: 14-10-2020
Publisher: Springer Science and Business Media LLC
Date: 16-05-2022
Abstract: We present a search for the charged lepton-flavor-violating decays ϒ(1 S ) → ℓ ± ℓ ′ ∓ and radiative charged lepton-flavour-violating decays ϒ(1 S ) → γ ℓ ± ℓ ′ ∓ [ ℓ , ℓ ′ = e, μ, τ ] using the 158 million ϒ(2 S ) s le collected by the Belle detector at the KEKB collider. This search uses ϒ(1 S ) mesons produced in ϒ(2 S ) → π + π − ϒ(1 S ) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level.
Publisher: American Physical Society (APS)
Date: 11-01-2022
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 17-08-2022
Publisher: American Physical Society (APS)
Date: 28-06-2023
Publisher: American Physical Society (APS)
Date: 29-06-2023
Publisher: American Physical Society (APS)
Date: 11-01-2022
Publisher: American Physical Society (APS)
Date: 11-01-2022
Publisher: American Physical Society (APS)
Date: 12-07-2021
Publisher: American Physical Society (APS)
Date: 12-07-2021
Publisher: American Physical Society (APS)
Date: 23-03-2021
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 11-07-2023
Publisher: American Physical Society (APS)
Date: 19-07-2019
Publisher: American Physical Society (APS)
Date: 11-07-2023
Publisher: American Physical Society (APS)
Date: 07-07-2023
Publisher: Springer Science and Business Media LLC
Date: 30-01-2023
Abstract: We report the measurement of the two-photon decay width of χ c 2 (1 P ) in two-photon processes at the Belle experiment. We analyze the process γγ → χ c 2 (1 P ) → J/ψγ , J/ψ → ℓ + ℓ − ( ℓ = e or μ ) using a data s le of 971 fb − 1 collected with the Belle detector at the KEKB e + e − collider. In this analysis, the product of the two-photon decay width of χ c 2 (1 P ) and the branching fraction is determined to be $$ {\\Gamma}_{\\gamma \\gamma}\\left({\\chi}_{c2}(1P)\\right)\\mathcal{B}\\left({\\chi}_{c2}(1P)\\to J/\\psi \\gamma \\right)\\mathcal{B}\\left(J/\\psi \\to {\\ell}^{+}{\\ell}^{-}\\right)=14.8\\pm 0.3\\left(\\textrm{stat}.\\right)\\pm 0.7\\left(\\textrm{syst}.\\right) $$ Γ γγ χ c 2 1 P B χ c 2 1 P → J / ψγ B J / ψ → ℓ + ℓ − = 14.8 ± 0.3 stat . ± 0.7 syst . eV, which corresponds to Γ γγ ( χ c 2 (1 P )) = 653 ± 13(stat.) ± 31(syst.) ± 17(B.R.) eV, where the third uncertainty is from $$ \\mathcal{B} $$ B ( χ c 2 (1 P ) → J/ψγ ) and $$ \\mathcal{B} $$ B ( J/ψ → ℓ + ℓ − ).
Publisher: American Physical Society (APS)
Date: 16-08-2021
Publisher: American Physical Society (APS)
Date: 10-07-2019
Publisher: American Physical Society (APS)
Date: 22-12-2021
Publisher: American Physical Society (APS)
Date: 25-02-2019
Publisher: American Physical Society (APS)
Date: 31-08-2017
Publisher: American Physical Society (APS)
Date: 10-06-2011
Publisher: American Physical Society (APS)
Date: 20-02-2019
Publisher: Springer Science and Business Media LLC
Date: 11-2014
Publisher: Oxford University Press (OUP)
Date: 02-2018
DOI: 10.1093/PTEP/PTY003
Publisher: American Physical Society (APS)
Date: 30-07-2018
Publisher: American Physical Society (APS)
Date: 08-02-2022
Publisher: American Physical Society (APS)
Date: 06-01-2022
Publisher: American Physical Society (APS)
Date: 18-07-2018
Publisher: Springer Science and Business Media LLC
Date: 06-2021
Abstract: Using a data s le of 980 fb − 1 collected with the Belle detector at the KEKB asymmetric-energy e + e − collider, we study the processes of $$ {\\Xi}_c^0\\to \\Lambda {\\overline{K}}^{\\ast 0} $$ Ξ c 0 → Λ K ¯ ∗ 0 , $$ {\\Xi}_c^0\\to {\\Sigma}^0{\\overline{K}}^{\\ast 0} $$ Ξ c 0 → Σ 0 K ¯ ∗ 0 , and $$ {\\Xi}_c^0\\to {\\Sigma}^{+}{K}^{\\ast -} $$ Ξ c 0 → Σ + K ∗ − for the first time. The relative branching ratios to the normalization mode of $$ {\\Xi}_c^0\\to {\\Xi}^{-}{\\pi}^{+} $$ Ξ c 0 → Ξ − π + are measured to be $$ {\\displaystyle \\begin{array}{c}\\mathcal{B}\\left({\\Xi}_c^0\\to \\Lambda {\\overline{K}}^{\\ast 0}\\right)/\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right)=0.18\\pm 0.02\\left(\\mathrm{stat}.\\right)\\pm 0.01\\left(\\mathrm{syst}.\\right),\\\\ {}\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Sigma}^0{\\overline{K}}^{\\ast 0}\\right)/\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right)=0.69\\pm 0.03\\left(\\mathrm{stat}.\\right)\\pm 0.03\\left(\\mathrm{syst}.\\right),\\\\ {}\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Sigma}^{+}{K}^{\\ast -}\\right)/\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right)=0.34\\pm 0.06\\left(\\mathrm{stat}.\\right)\\pm 0.02\\left(\\mathrm{syst}.\\right),\\end{array}} $$ B Ξ c 0 → Λ K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.18 ± 0.02 stat . ± 0.01 syst . , B Ξ c 0 → Σ 0 K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.69 ± 0.03 stat . ± 0.03 syst . , B Ξ c 0 → Σ + K ∗ − / B Ξ c 0 → Ξ − π + = 0.34 ± 0.06 stat . ± 0.02 syst . , where the uncertainties are statistical and systematic, respectively. We obtain $$ {\\displaystyle \\begin{array}{c}\\mathcal{B}\\left({\\Xi}_c^0\\to \\Lambda {\\overline{K}}^{\\ast 0}\\right)=\\left(3.3\\pm 0.3\\left(\\mathrm{stat}.\\right)\\pm 0.2\\left(\\mathrm{syst}.\\right)\\pm 1.0\\left(\\mathrm{ref}.\\right)\\right)\\times {10}^{-3},\\\\ {}\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Sigma}^0{\\overline{K}}^{\\ast 0}\\right)=\\left(12.4\\pm 0.5\\left(\\mathrm{stat}.\\right)\\pm 0.5\\left(\\mathrm{syst}.\\right)\\pm 3.6\\left(\\mathrm{ref}.\\right)\\right)\\times {10}^{-3},\\\\ {}\\mathcal{B}\\left({\\Xi}_c^0\\to {\\Sigma}^{+}{K}^{\\ast 0}\\right)=\\left(6.1\\pm 1.0\\left(\\mathrm{stat}.\\right)\\pm 0.4\\left(\\mathrm{syst}.\\right)\\pm 1.8\\left(\\mathrm{ref}.\\right)\\right)\\times {10}^{-3},\\end{array}} $$ B Ξ c 0 → Λ K ¯ ∗ 0 = 3.3 ± 0.3 stat . ± 0.2 syst . ± 1.0 ref . × 10 − 3 , B Ξ c 0 → Σ 0 K ¯ ∗ 0 = 12.4 ± 0.5 stat . ± 0.5 syst . ± 3.6 ref . × 10 − 3 , B Ξ c 0 → Σ + K ∗ 0 = 6.1 ± 1.0 stat . ± 0.4 syst . ± 1.8 ref . × 10 − 3 , where the uncertainties are statistical, systematic, and from $$ \\mathcal{B}\\left({\\Xi}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right) $$ B Ξ c 0 → Ξ − π + , respectively. The asymmetry parameters $$ \\alpha \\left({\\Xi}_c^0\\to \\Lambda {\\overline{K}}^{\\ast 0}\\right) $$ α Ξ c 0 → Λ K ¯ ∗ 0 and $$ \\alpha \\left({\\Xi}_c^0\\to {\\Sigma}^{+}{K}^{\\ast -}\\right) $$ α Ξ c 0 → Σ + K ∗ − are 0 . 15 ± 0 . 22(stat . ) ± 0 . 04(syst . ) and − 0 . 52 ± 0 . 30(stat . ) ± 0 . 02(syst . ), respectively, where the uncertainties are statistical followed by systematic.
Publisher: American Physical Society (APS)
Date: 03-12-2018
Publisher: American Physical Society (APS)
Date: 16-08-2023
Publisher: Springer Science and Business Media LLC
Date: 05-2020
Publisher: Elsevier BV
Date: 10-2013
Publisher: American Physical Society (APS)
Date: 02-2018
Publisher: American Physical Society (APS)
Date: 23-03-2011
Publisher: American Physical Society (APS)
Date: 14-06-2019
Publisher: Springer Science and Business Media LLC
Date: 08-2018
Publisher: American Physical Society (APS)
Date: 07-02-2019
Publisher: American Physical Society (APS)
Date: 02-05-2023
Publisher: American Physical Society (APS)
Date: 31-08-2017
Publisher: American Physical Society (APS)
Date: 02-05-2023
Publisher: American Physical Society (APS)
Date: 21-02-2019
Publisher: American Physical Society (APS)
Date: 04-05-2018
Publisher: American Physical Society (APS)
Date: 31-10-2023
Publisher: American Physical Society (APS)
Date: 28-05-2019
Publisher: American Physical Society (APS)
Date: 27-11-2017
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 15-11-2018
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 19-12-2018
Publisher: American Physical Society (APS)
Date: 15-10-2019
Publisher: American Physical Society (APS)
Date: 28-06-2023
Publisher: American Physical Society (APS)
Date: 14-06-2018
Publisher: American Physical Society (APS)
Date: 17-12-2018
Publisher: American Physical Society (APS)
Date: 08-02-2023
Publisher: American Physical Society (APS)
Date: 12-08-2019
Publisher: American Physical Society (APS)
Date: 05-12-2017
Publisher: American Physical Society (APS)
Date: 19-10-2020
Publisher: American Physical Society (APS)
Date: 26-10-2020
Publisher: Springer Science and Business Media LLC
Date: 20-04-2022
Abstract: We report a measurement of the electric dipole moment of the τ lepton ( dτ ) using an 833 fb − 1 data s le collected near the Υ(4 S ) resonance, with the Belle detector at the KEKB asymmetric-energy e + e − collider. Using an optimal observable method, we obtain the real and imaginary parts of d τ as Re( d τ ) = ( − 0 . 62 ± 0 . 63) × 10 − 17 e cm and Im( d τ ) = ( − 0 . 40 ± 0 . 32) × 10 − 17 e cm, respectively. These results are consistent with null electric dipole moment at the present level of experimental sensitivity and improve the sensitivity by about a factor of three.
Publisher: Elsevier BV
Date: 03-2023
Publisher: American Physical Society (APS)
Date: 14-04-2021
Publisher: American Physical Society (APS)
Date: 04-01-2019
Publisher: American Physical Society (APS)
Date: 31-12-2019
Publisher: Springer Science and Business Media LLC
Date: 21-09-2023
Publisher: American Physical Society (APS)
Date: 24-12-2020
Publisher: American Physical Society (APS)
Date: 10-01-2018
Publisher: American Physical Society (APS)
Date: 27-10-2021
Publisher: American Physical Society (APS)
Date: 19-03-2015
Publisher: American Physical Society (APS)
Date: 10-01-2018
Publisher: American Physical Society (APS)
Date: 29-01-2019
Publisher: American Physical Society (APS)
Date: 25-01-2018
Publisher: Springer Science and Business Media LLC
Date: 12-01-2023
Abstract: Using a data s le of 980 fb − 1 collected with the Belle detector at the KEKB asymmetric-energy e + e − collider, we study for the first time the singly Cabibbo-suppressed decays $$ {\\Omega}_c^0\\to {\\Xi}^{-}{\\pi}^{+} $$ Ω c 0 → Ξ − π + and Ω − K + and the doubly Cabibbo-suppressed decay $$ {\\Omega}_c^0\\to {\\Xi}^{-}{K}^{+} $$ Ω c 0 → Ξ − K + . Evidence for an $$ {\\Omega}_c^0 $$ Ω c 0 signal in the $$ {\\Omega}_c^0 $$ Ω c 0 → Ξ − π + mode is reported with a significance of 4 . 5 σ including systematic uncertainties. The ratio of branching fractions to the normalization mode $$ {\\Omega}_c^0 $$ Ω c 0 → Ω − π + is measured to be $$ \\mathcal{B}\\left({\\Omega}_c^0\\to {\\Xi}^{-}{\\pi}^{+}\\right)/\\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{\\pi}^{+}\\right)=0.253\\pm 0.052\\left(\\textrm{stat}.\\right)\\pm 0.030\\left(\\textrm{syst}.\\right). $$ B Ω c 0 → Ξ − π + / B Ω c 0 → Ω − π + = 0.253 ± 0.052 stat . ± 0.030 syst . . No significant signals of $$ {\\Omega}_c^0\\to {\\Xi}^{-}{K}^{+} $$ Ω c 0 → Ξ − K + and Ω − K + modes are found. The upper limits at 90% confidence level on ratios of branching fractions are determined to be $$ \\mathcal{B}\\left({\\Omega}_c^0\\to {\\Xi}^{-}{K}^{+}\\right)/\\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{\\pi}^{+}\\right) .070 $$ B Ω c 0 → Ξ − K + / B Ω c 0 → Ω − π + 0.070 and $$ \\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{K}^{+}\\right)/\\mathcal{B}\\left({\\Omega}_c^0\\to {\\Omega}^{-}{\\pi}^{+}\\right) .29. $$ B Ω c 0 → Ω − K + / B Ω c 0 → Ω − π + 0.29 .
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 09-10-2018
Publisher: American Physical Society (APS)
Date: 04-03-2022
Publisher: American Physical Society (APS)
Date: 29-11-2021
Publisher: American Physical Society (APS)
Date: 12-05-2020
Publisher: American Physical Society (APS)
Date: 27-07-2021
Publisher: Springer Science and Business Media LLC
Date: 10-2019
Abstract: We report a new measurement of the e + e − → ϒ( nS ) π + π − ( n = 1 , 2 , 3) cross sections at energies from 10 . 52 to 11 . 02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy e + e − collider. We observe a new structure in the energy dependence of the cross sections if described by a Breit-Wigner function its mass and width are found to be $$ M=\\left(10752.7\\pm {5.9}_{-1.1}^{+0.7}\\right)\\mathrm{MeV}/{c}^2 $$ M = 10752.7 ± 5.9 − 1.1 + 0.7 MeV / c 2 and $$ \\Gamma =\\left({35.5}_{-11.3\\kern0.5em -3.3}^{+17.6+3.9}\\right) $$ Γ = 35.5 − 11.3 − 3.3 + 17.6 + 3.9 MeV, where the first error is statistical and the second is systematic. The global significance of the new structure including systematic uncertainty is 5.2 standard deviations. We also find evidence for the e + e − → ϒ (1 S ) π + π − process at the energy 10 . 52 GeV, which is below the B $$ \\overline{B} $$ B ¯ threshold.
Publisher: American Physical Society (APS)
Date: 19-08-2019
Publisher: American Physical Society (APS)
Date: 03-03-2023
Publisher: American Physical Society (APS)
Date: 09-06-2021
Publisher: American Physical Society (APS)
Date: 03-06-2021
Publisher: American Physical Society (APS)
Date: 23-04-2012
Publisher: American Physical Society (APS)
Date: 06-2021
Publisher: Springer Science and Business Media LLC
Date: 21-06-2023
Abstract: Charged-lepton-flavor-violation is predicted in several new physics scenarios. We update the analysis of τ lepton decays into a light charged lepton ( ℓ = e ± or μ ± ) and a vector meson ( V 0 = ρ 0 , ϕ , ω , K *0 , or $$ \\overline{K} $$ K ¯ *0 ) using 980 fb − 1 of data collected with the Belle detector at the KEKB collider. No significant excess of such signal events is observed, and thus 90% credibility level upper limits are set on the τ → ℓV 0 branching fractions in the range of (1.7–4 . 3) × 10 − 8 . These limits are improved by 30% on average from the previous results.
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 09-04-2018
Publisher: American Physical Society (APS)
Date: 06-07-2020
Publisher: American Physical Society (APS)
Date: 08-07-2020
Publisher: American Physical Society (APS)
Date: 30-12-2021
Publisher: American Physical Society (APS)
Date: 28-06-2022
Publisher: American Physical Society (APS)
Date: 26-03-2020
Publisher: American Physical Society (APS)
Date: 25-07-2022
Publisher: American Physical Society (APS)
Date: 27-01-2023
Publisher: American Physical Society (APS)
Date: 30-11-2018
Publisher: American Physical Society (APS)
Date: 03-10-2018
Publisher: American Physical Society (APS)
Date: 24-01-2023
Publisher: American Physical Society (APS)
Date: 26-12-2018
Publisher: Springer Science and Business Media LLC
Date: 21-08-2023
Abstract: We report the first measurement of the inclusive e + e − → $$ b\\overline{b} $$ b b ¯ → $$ {D}_s^{\\pm } $$ D s ± X and e + e − → $$ b\\overline{b} $$ b b ¯ → D 0 / $$ {\\overline{D}}^0 $$ D ¯ 0 X cross sections in the energy range from 10 . 63 to 11 . 02 GeV. Based on these results, we determine σ ( e + e − → $$ {B}_s^0{\\overline{B}}_s^0 $$ B s 0 B ¯ s 0 X ) and σ ( e + e − → $$ B\\overline{B} $$ B B ¯ X ) in the same energy range. We measure the fraction of $$ {B}_s^0 $$ B s 0 events at Υ(10860) to be f s = ( $$ {22.0}_{-2.1}^{+2.0} $$ 22.0 − 2.1 + 2.0 )%. We determine also the ratio of the $$ {B}_s^0 $$ B s 0 inclusive branching fractions $$ \\mathcal{B} $$ B ( $$ {B}_s^0 $$ B s 0 → D 0 / $$ {\\overline{D}}^0 $$ D ¯ 0 X ) / $$ \\mathcal{B} $$ B ( $$ {B}_s^0 $$ B s 0 → $$ {D}_s^{\\pm } $$ D s ± X ) = 0 . 416 ± 0 . 018 ± 0 . 092. The results are obtained using the data collected with the Belle detector at the KEKB asymmetric-energy e + e − collider.
Publisher: Springer Science and Business Media LLC
Date: 09-2021
Abstract: We measure the branching fractions and CP asymmetries for the singly Cabibbo-suppressed decays D 0 → π + π − η , D 0 → K + K − η , and D 0 → ϕη , using 980 fb − 1 of data from the Belle experiment at the KEKB e + e − collider. We obtain $$ {\\displaystyle \\begin{array}{c}\\mathcal{B}\\left({D}^0\\to {\\pi}^{+}{\\pi}^{-}\\eta \\right)=\\left[1.22\\pm 0.02\\left(\\mathrm{stat}\\right)\\pm 0.02\\left(\\mathrm{syst}\\right)\\pm 0.03\\left({\\mathcal{B}}_{\\mathrm{ref}}\\right)\\right]\\times {10}^{-3},\\\\ {}\\mathcal{B}\\left({D}^0\\to {K}^{+}{K}^{-}\\eta \\right)=\\left[{1.80}_{-0.06}^{+0.07}\\left(\\mathrm{stat}\\right)\\pm 0.04\\left(\\mathrm{syst}\\right)\\pm 0.05\\left({\\mathcal{B}}_{\\mathrm{ref}}\\right)\\right]\\times {10}^{-4},\\\\ {}\\mathcal{B}\\left({D}^0\\to \\phi \\eta \\right)=\\left[1.84\\pm 0.09\\left(\\mathrm{stat}\\right)\\pm 0.06\\left(\\mathrm{syst}\\right)\\pm 0.05\\left({\\mathcal{B}}_{\\mathrm{ref}}\\right)\\right]\\times {10}^{-4},\\end{array}} $$ B D 0 → π + π − η = 1.22 ± 0.02 stat ± 0.02 syst ± 0.03 B ref × 10 − 3 , B D 0 → K + K − η = 1.80 − 0.06 + 0.07 stat ± 0.04 syst ± 0.05 B ref × 10 − 4 , B D 0 → ϕη = 1.84 ± 0.09 stat ± 0.06 syst ± 0.05 B ref × 10 − 4 , where the third uncertainty ( $$ \\mathcal{B} $$ B ref ) is from the uncertainty in the branching fraction of the reference mode D 0 → K − π + η . The color-suppressed decay D 0 → ϕη is observed for the first time, with very high significance. The results for the CP asymmetries are $$ {\\displaystyle \\begin{array}{c}{A}_{CP}\\left({D}^0\\ {\\pi}^{+}{\\pi}^{-}\\eta \\right)=\\left[0.9\\pm 1.2\\left(\\mathrm{stat}\\right)\\pm 0.5\\left(\\mathrm{syst}\\right)\\right]\\%,\\\\ {}{A}_{CP}\\left({D}^0\\to {K}^{+}{K}^{-}\\eta \\right)=\\left[-1.4\\pm 3.3\\left(\\mathrm{stat}\\right)\\pm 1.1\\left(\\mathrm{syst}\\right)\\right]\\%,\\\\ {} ACP\\ \\left({D}^0\\to \\phi \\eta \\right)=\\left[-1.9\\pm 4.4\\left(\\mathrm{stat}\\right)\\pm 0.6\\left(\\mathrm{syst}\\right)\\right]\\%.\\end{array}} $$ A CP D 0 π + π − η = 0.9 ± 1.2 stat ± 0.5 syst % , A CP D 0 → K + K − η = − 1.4 ± 3.3 stat ± 1.1 syst % , ACP D 0 → ϕη = − 1.9 ± 4.4 stat ± 0.6 syst % . The results for D 0 → π + π − η are a significant improvement over previous results. The branching fraction and A CP results for D 0 → K + K − η , and the ACP result for D 0 → ϕη , are the first such measurements. No evidence for CP violation is found in any of these decays.
Publisher: American Physical Society (APS)
Date: 08-07-2022
Publisher: American Physical Society (APS)
Date: 11-09-2019
Publisher: Oxford University Press (OUP)
Date: 02-2020
DOI: 10.1093/PTEP/PTAA008
Publisher: American Physical Society (APS)
Date: 27-02-2023
Publisher: arXiv
Date: 2022
Publisher: American Physical Society (APS)
Date: 30-12-2019
Publisher: arXiv
Date: 2022
Publisher: Springer Science and Business Media LLC
Date: 10-2019
Abstract: We present the first model-independent measurement of the CKM unitarity triangle angle ϕ 3 using B ± → D ( $$ {K}_{\\mathrm{S}}^0 $$ K S 0 π + π − π 0 ) K ± decays, where D indicates either a D 0 or $$ \\overline{D} $$ D ¯ 0 meson. Measurements of the strong-phase difference of the D → $$ {K}_{\\mathrm{S}}^0 $$ K S 0 π + π − π 0 litude obtained from CLEO-c data are used as input. This analysis is based on the full Belle data set of 772 × 10 6 B $$ \\overline{B} $$ B ¯ events collected at the Υ(4 S ) resonance. We obtain ϕ 3 = ( $$ {5.7}_{-8.8}^{+10.2} $$ 5.7 − 8.8 + 10.2 ± 3 . 5 ± 5 . 7) ° and the suppressed litude ratio r B = 0 . 323 ± 0 . 147 ± 0 . 023 ± 0 . 051. Here the first uncertainty is statistical, the second is the experimental systematic, and the third is due to the precision of the strong-phase parameters measured from CLEO-c data. The 95% confidence interval on ϕ 3 is ( − 29 . 7 , 109 . 5) ° , which is consistent with the current world average.
Publisher: Springer Science and Business Media LLC
Date: 04-2021
Abstract: We present a search for the dark photon A ′ in the B 0 → A ′ A ′ decays, where A ′ subsequently decays to e + e − , μ + μ − , and π + π − . The search is performed by analyzing 772 × 10 6 $$ B\\overline{B} $$ B B ¯ events collected by the Belle detector at the KEKB e + e − energy-asymmetric collider at the ϒ(4 S ) resonance. No signal is found in the dark photon mass range 0 . 01 GeV /c 2 ≤ m A ′ ≤ 2 . 62 GeV /c 2 , and we set upper limits of the branching fraction of B 0 → A ′ A ′ at the 90% confidence level. The products of branching fractions, $$ \\mathrm{\\mathcal{B}}\\left({B}^0\\to A^{\\prime }A^{\\prime}\\right)\\times \\mathrm{\\mathcal{B}}{\\left(A\\prime \\to {e}^{+}{e}^{-}\\right)}^2 $$ ℬ B 0 → A ′ A ′ × ℬ A ′ → e + e − 2 and $$ \\mathrm{\\mathcal{B}}\\left({B}^0\\to A^{\\prime }A^{\\prime}\\right)\\times \\mathrm{\\mathcal{B}}{\\left(A\\prime \\to {\\mu}^{+}{\\mu}^{-}\\right)}^2 $$ ℬ B 0 → A ′ A ′ × ℬ A ′ → μ + μ − 2 , have limits of the order of 10 − 8 depending on the A ′ mass. Furthermore, considering A ′ decay rate to each pair of charged particles, the upper limits of $$ \\mathrm{\\mathcal{B}}\\left({B}^0\\to A^{\\prime }A^{\\prime}\\right) $$ ℬ B 0 → A ′ A ′ are of the order of 10 − 8 –10 − 5 . From the upper limits of $$ \\mathrm{\\mathcal{B}}\\left({B}^0\\to A^{\\prime }A^{\\prime}\\right) $$ ℬ B 0 → A ′ A ′ , we obtain the Higgs portal coupling for each assumed dark photon and dark Higgs mass. The Higgs portal couplings are of the order of 10 − 2 –10 − 1 at $$ {m}_{h\\prime}\\simeq {m}_{B^0} $$ m h ′ ≃ m B 0 ± 40 MeV /c 2 and 10 − 1 –1 at $$ {m}_{h\\prime}\\simeq {m}_{B^0} $$ m h ′ ≃ m B 0 ± 3 GeV /c 2 .
Publisher: American Physical Society (APS)
Date: 13-03-2018
Publisher: Springer Science and Business Media LLC
Date: 11-2018
Publisher: American Physical Society (APS)
Date: 02-08-2023
Publisher: American Physical Society (APS)
Date: 15-02-2023
Publisher: Springer Science and Business Media LLC
Date: 07-12-2022
Publisher: American Physical Society (APS)
Date: 14-02-2023
Publisher: American Physical Society (APS)
Date: 15-02-2023
Publisher: American Physical Society (APS)
Date: 08-04-2022
Publisher: American Physical Society (APS)
Date: 22-09-2022
Publisher: American Physical Society (APS)
Date: 14-09-2023
Publisher: American Physical Society (APS)
Date: 21-02-2023
Publisher: American Physical Society (APS)
Date: 02-08-2018
Publisher: Springer Science and Business Media LLC
Date: 18-08-2023
Abstract: We measure the cross section of e + e − → η c J/ψ at the Υ( nS )( n = 1–5) on-resonance and 10.52 GeV off-resonance energy points using the full data s le collected by the Belle detector with an integrated luminosity of 955 fb − 1 . We also search for double charmonium production in e + e − → η c J/ψ via initial state radiation near the η c J/ψ threshold. No evident signal of the double charmonium state is found, but evidence for the e + e − → η c J/ψ process is found with a statistical significance greater than 3 . 3 σ near the η c J/ψ threshold. The average cross section near the threshold is measured and upper limits of cross sections are set for other regions.
Publisher: American Physical Society (APS)
Date: 08-02-2021
Publisher: American Physical Society (APS)
Date: 19-10-2021
Publisher: American Physical Society (APS)
Date: 15-12-2021
Publisher: American Physical Society (APS)
Date: 28-12-2018
Publisher: American Physical Society (APS)
Date: 10-07-2019
Publisher: American Physical Society (APS)
Date: 07-02-2023
Publisher: American Physical Society (APS)
Date: 16-05-2022
Publisher: American Physical Society (APS)
Date: 22-09-2023
Publisher: American Physical Society (APS)
Date: 26-12-2018
Location: No location found
No related grants have been discovered for Vipin Gaur.