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論文

Measurement of branching fractions and search for $$CP$$ violation in $$D^{0}topi^{+}pi^{-}eta$$, $$D^{0}to K^{+}K^{-}eta$$, and $$D^{0}tophieta$$ at Belle

Li, L. K.*; 谷田 聖; Belle Collaboration*; 他187名*

Journal of High Energy Physics (Internet), 2021(9), p.75_1 - 75_21, 2021/09

https://doi.org/10.1007/JHEP09(2021)075
 被引用回数：1 パーセンタイル：10.54(Physics, Particles & Fields)

We measure the branching fractions and $$CP$$ asymmetries for the singly Cabibbo-suppressed decays $$D^{0}topi^{+}pi^{-}eta$$, $$D^{0}to K^{+}K^{-}eta$$, and $$D^{0}tophieta$$, using 980 fb$$^{-1}$$ of data from the Belle experiment at the KEKB $$e^+e^-$$ collider. We obtain $$mathcal{B}(D^{0}topi^{+}pi^{-}eta) = [1.22pm 0.02,({rm stat})pm 0.02,({rm syst})pm 0.03,(mathcal{B}_{rm ref})]times 10^{-3},, mathcal{B}(D^{0}to K^{+}K^{-}eta) = [1.80,^{+0.07}_{-0.06},({rm stat})pm 0.04,({rm syst})pm 0.05,(mathcal{B}_{rm ref})]times 10^{-4},, mathcal{B}(D^{0}tophieta) = [1.84pm 0.09,({rm stat})pm 0.06,({rm syst})pm 0.05,(mathcal{B}_{rm ref})]times 10^{-4},, $$ where the third uncertainty ($$mathcal{B}_{rm ref}$$) is from the uncertainty in the branching fraction of the reference mode $$D^{0} to K^{-}pi^{+}eta$$. The color-suppressed decay $$D^{0}tophieta$$ is observed for the first time, with very high significance. The results for the $$CP$$ asymmetries are $$A_{CP}(D^{0}topi^{+}pi^{-}eta) = [0.9pm 1.2,({rm stat})pm 0.5,({rm syst})]%,, A_{CP}(D^{0}to K^{+}K^{-}eta) = [-1.4pm 3.3,({rm stat})pm 1.1,({rm syst})]%,, A_{CP}(D^{0}tophieta) = [-1.9pm 4.4,({rm stat})pm 0.6,({rm syst})]%,. $$ The results for $$D^{0}topi^{+}pi^{-}eta$$ are a significant improvement over previous results. The branching fraction and $$A_{CP}$$ results for $$D^{0}to K^{+}K^{-}eta$$, and the $$A_{CP}$$ result for $$D^{0}tophieta$$, are the first such measurements. No evidence for $$CP$$ violation is found in any of these decays.

論文

Measurement of the CKM matrix element $$|V_{cb}|$$ from $$B^0to D^{*-}ell^ {+} nu_ell$$ at Belle

Waheed, E.*; 谷田 聖; Belle Collaboration*; 他187名*

Physical Review D, 100(5), p.052007_1 - 052007_32, 2019/09

https://doi.org/10.1103/PhysRevD.100.052007
 被引用回数：43 パーセンタイル：91.47(Astronomy & Astrophysics)

We present a new measurement of the CKM matrix element $$|V_{cb}|$$ from $$ B^{0} rightarrow D^{*}ell nu$$ decays, reconstructed with full Belle data set ($$711 , rm fb^{-1}$$). Two form factor parameterisations, based on work by the CLN and BGL groups, are used to extract the product $$mathcal{F}(1)eta_{rm EW}|V_{cb}|$$ and the decay form factors, where $$mathcal{F}(1)$$ is the factor normalisation and $$eta_{rm EW}$$ is a small electroweak correction. In the CLN parameterisation we find $$mathcal{F}(1)eta_{rm EW}|V_{cb}| = (35.06 pm 0.15 pm 0.54) times 10^{-3}$$, $$rho^{2}=1.106 pm 0.031 pm 0.007$$, $$R_{1}(1)=1.229 pm 0.028 pm 0.009$$, $$R_{2}(1)=0.852 pm 0.021 pm 0.006$$. In the BGL parameterisation we find $$mathcal{F}(1)eta_{rm EW}|V_{cb}|= 38.73 pm 0.25 pm 0.60$$, which is higher but consistent with the determination from inclusive semileptonic $$B$$ decays when correcting for $$mathcal{F}(1)eta_{rm EW}$$. This is the most precise measurement of $$mathcal{F}(1)eta_{rm EW}|V_{cb}|$$ and form factors that has ever been carried out, and the first direct study of the BGL form factor parameterisation in an experimental measurement.

論文

Search for $$B^{-}tomu^{-}barnu_mu$$ decays at the Belle experiment

Sibidanov, A.*; 谷田 聖; Belle Collaboration*; 他187名*

Physical Review Letters, 121(3), p.031801_1 - 031801_8, 2018/07

AA2018-0589.pdf:0.39MB

https://doi.org/10.1103/PhysRevLett.121.031801
 被引用回数：16 パーセンタイル：71.75(Physics, Multidisciplinary)

We report the result of a search for the decay $$B^{-}tomu^{-}barnu_mu$$. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic $$B$$-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of $${cal B}(B^{-}tomu^{-}barnu_mu) =(6.46 pm 2.22 pm 1.60) times10^{-7}$$ or a frequentist 90% confidence level interval on the $$B^{-}tomu^{-}barnu_mu$$ branching fraction of $$[2.9, 10.7]times 10^{-7}$$. This result is obtained from a 711 fb$$^{-1}$$ data sample that contains $$772 times 10^6$$ $$Bbar{B}$$ pairs, collected near the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider.

論文

Measurement of branching fractions of hadronic decays of the $$Omega_c^0$$ baryon

Yelton, J.*; 谷田 聖; Belle Collaboration*; 他187名*

Physical Review D, 97(3), p.032001_1 - 032001_8, 2018/02

AA2018-0512.pdf:0.46MB

https://doi.org/10.1103/PhysRevD.97.032001
 被引用回数：10 パーセンタイル：48.48(Astronomy & Astrophysics)

Using a data sample of 980 $${rm fb}^{-1}$$ of $$e^+e^-$$ annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy $$e^+e^-$$ collider, we report the results of a study of the decays of the $$Omega_c^0$$ charmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the $$Omega_c^0$$ into $$Omega^-pi^+pi^0$$, $$Omega^-pi^+pi^-pi^+$$, $$Xi^-K^-pi^+pi^+$$, and $$Xi^0K^-pi^+$$, as well as the first measurements of the branching fractions of the $$Omega_c^0$$ into $$Xi^-bar{K}^0pi^+$$, $$Xi^0bar{K}^0$$, and $$Lambda bar{K}^0bar{K}^0$$, all with respect to the $$Omega^-pi^+$$ decay. In addition, we investigate the resonant substructure of these modes. Finally, we present a limit on the branching fraction for the decay $$Omega_c^0toSigma^+K^-K^-pi^+$$.

論文

Measurements of the absolute branching fractions of $$B^{+} to X_{cbar{c}} K^{+}$$ and $$B^{+} to bar{D}^{(ast) 0} pi^{+} $$ at Belle

加藤 悠二*; 谷田 聖; Belle Collaboration*; 他187名*

Physical Review D, 97(1), p.012005_1 - 012005_10, 2018/01

AA2018-0509.pdf:0.51MB

https://doi.org/10.1103/PhysRevD.97.012005
 被引用回数：24 パーセンタイル：75.86(Astronomy & Astrophysics)

We present the measurement of the absolute branching fractions of $$B^{+} to X_{cbar{c}} K^{+}$$ and $$B^{+} to bar{D}^{(ast) 0} pi^{+} $$ decays, using a data sample of $$772times10^{6}$$ $$Bbar{B}$$ pairs collected at the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^{+}e^{-}$$ collider. Here, $$X_{cbar{c}}$$ denotes $$eta_{c}$$, $$J/psi$$, $$chi_{c0}$$, $$chi_{c1}$$, $$eta_{c}(2S)$$, $$psi(2S)$$, $$psi(3770)$$, $$X(3872)$$, and $$X(3915)$$. We do not observe significant signals for $$X(3872)$$ nor $$X(3915)$$, and set the 90$$%$$ confidence level upper limits: $${cal B}(B^{+} to X(3872) K^{+} ) < 2.7 times 10^{-4}$$ and $${cal B}(B^{+} to X(3915) K^{+} ) < 2.9 times 10^{-4}$$. These represent the most stringent upper limit for $${cal B}(B^{+} to X(3872) K^{+} )$$ to date and the first measurement for $${cal B}(B^{+} to X(3915) K^{+} )$$. The measured branching fractions for $$eta_{c}$$ and $$eta_{c}(2S)$$ are the most precise to date: $${cal B}(B^{+} to eta_{c} K^{+})=(12.3pm0.8pm0.7) times 10^{-4}$$ and $${cal B}(B^{+} to eta_{c}(2S)K^{+}) =(4.9pm1.1pm0.3) times 10^{-4}$$, where the first and second uncertainties are statistical and systematic, respectively.

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