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Study of B →p p ππ
Physical Review D - Particles, Fields, Gravitation and Cosmology. 2020. Vol. 101. No. 5. P. 1-8.
Using a data sample of 772×106 BB pairs collected on the Ï'(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e-collider, we report the observation of B0→ppπ+π- A nd the first observation of B+→ppπ+π0. We measure a decay branching fraction of (0.83±0.17±0.17)×10-6 in B0→ppπ+π-for Mπ+π-<1.22 GeV/c2 with a significance of 5.5 standard deviations. The contribution from B0→ppK0 is excluded. We measure a decay branching fraction of (4.58±1.17±0.67)×10-6 for B+→ppπ+π0 with Mπ+π0<1.3 GeV/c2 with a significance of 5.4 standard deviations. We study the difference of the Mpp distributions in B0→ppπ+π- A nd B+→ppπ+π0. © 2020 authors.
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review Letters 2019 Vol. 122 No. 7 P. 1-7
We report the first observation of the double strange baryon Ξ(1620)0 in its decay to Ξ-π+ via Ξc+→Ξ-π+π+ decays based on a 980 fb-1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The mass and width are measured to be 1610.4±6.0(stat)-4.2+6.1 (syst) MeV/c2 and 59.9±4.8(stat)-7.1+2.8(syst) MeV, respectively. We obtain 4.0σ ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2019 Vol. 99 No. 9 P. 1-8
We report a search for the charmless baryonic decay B0→ppπ0 with a data sample corresponding to an integrated luminosity of 711 fb-1 containing (772±10)×106 BB pairs. The data were collected by the Belle experiment running on the (4S) resonance at the KEKB e+e- collider. We measure a branching fraction B(B0→ppπ0)=(5.0±1.8±0.6)×10-7, where the first uncertainty is ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2019 Vol. 100 No. 3 P. 1-11
Using data samples of e+e- collisions collected at the I(1S), I(2S), and I(3S) resonances with the Belle detector, we search for the three-body decay of the ω(2012) baryon to KπΞ. This decay is predicted to dominate for models describing the ω(2012) as a KΞ(1530) molecule. No significant ω(2012) signals are observed in the studied channels, ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlova G. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2019 Vol. 99 No. 1 P. 1-7
We search for CP violation in the singly-Cabibbo-suppressed decay D0→K+K-π+π- using data corresponding to an integrated luminosity of 988 fb-1 collected by the Belle detector at the KEKB e+e- collider. We measure a set of five kinematically dependent CP asymmetries, of which four asymmetries are measured for the first time. The set of asymmetry measurements ...
Added: October 28, 2020
Ku Y., Chang P., Aushev T. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2020 Vol. 102 No. 1 P. 1-9
We report searches for B0→invisible and B0→invisible+γ decays, where the energy of the photon is required to be larger than 0.5 GeV. These results are obtained from a 711 fb-1 data sample that contains 772×106BB¯ pairs and was collected near the ϒ(4S) resonance with the Belle detector at the KEKB e+e- collider. We observe no ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2018 Vol. 97 No. 3 P. 1-8
Using a data sample of 980 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 Ωc0 charmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2019 Vol. 100 No. 7 P. 1-9
We present the first measurements of branching fractions of rare tau-lepton decays, τ-→π-ντ+- (=e or μ), using a data sample corresponding to 562 fb-1 collected at a center-of-mass energy of 10.58 GeV with the Belle detector at the KEKB asymmetric-energy e+e- collider. The τ-→π-ντe+e- decay is observed for the first time with 7.0σ significance. The ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2019 Vol. 100 No. 1 P. 1-16
A search for the decays B+→hcK+ and B0→hcKS0 is performed. Evidence for the decay B+→hcK+ is found; its significance is 4.8σ. No evidence is found for B0→hcKS0. The branching fraction for B+→hcK+ is measured to be (3.7-0.9+1.0 -0.8+0.8)×10-5; the upper limit for the B0→hcKS0 branching fraction is 1.4×10-5 at 90% C.L. In addition, a study ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2019 Vol. 100 No. 1 P. 1-8
We report the results of a search for the decay B0→X(3872)(→J/ψπ+π-)γ. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb-1 and containing 772×106BB pairs, collected with the Belle detector at the KEKB asymmetric-energy e+e- collider running at the (4S) resonance energy. We find no evidence for a signal ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlova G. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2019 Vol. 99 No. 3 P. 1-9
We study charmless hadronic decays of charged B mesons to the final states KS0KS0K± and KS0KS0π± using a 711 fb-1 data sample that contains 772×106 BB̄ pairs and was collected at the Ï (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. For B±→KS0KS0K±, the measured branching fraction and direct CP asymmetry ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlova G. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2019 Vol. 100 No. 1 P. 1-9
We report a measurement of the branching fraction and final-state asymmetry for the B0?KS0K±p± decays. The analysis is based on a data sample of 711 fb-1 collected at the ?(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We obtain a branching fraction of (3.60±0.33±0.15)×10-6 and a final-state asymmetry of (-8.5±8.9±0.2)%, where ...
Added: October 28, 2020
Chen Y. Q., Aushev T., Mizuk R. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2020 Vol. 102 No. 1 Article 012002
We present the results of the first Dalitz plot analysis of the decay D0→K-π+η. The analysis is performed on a data set corresponding to an integrated luminosity of 953 fb-1 collected by the Belle detector at the asymmetric-energy e+e- KEKB collider. The Dalitz plot is well described by a combination of the six resonant decay ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2018 Vol. 97 No. 5 P. 1-20
We report a measurement of the cross section for KS0 pair production in single-tag two-photon collisions, γ∗γ→KS0KS0, for Q2 up to 30 GeV2, where Q2 is the negative of the invariant mass squared of the tagged photon. The measurement covers the kinematic range 1.0 GeV<W<2.6 GeV and |cosθ∗|<1.0 for the total energy and kaon scattering ...
Added: October 28, 2020
Derkach D., Nuclear and Particle Physics Proceedings 2016 P. 1382-1386
Charmed hadrons are a unique probe of CP violation with up-type quarks. Yet, CPviolation in the charm sector is very suppressed by tiny CKM phases in the Standard Model. Any large non-zero measurement would thus be a sign of New Physics. We report on recent measurements of CP asymmetries in multibody charmed meson and baryon decays. The CP asymmetries are studied in ...
Added: June 1, 2016
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2018 Vol. 98 No. 11 P. 1-29
We report measurements of sin2β and cos2β using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→KS0π+π- decays, where the light unflavored and neutral hadron h0 is a π0, η, or ω meson. The analysis uses a combination of the final data sets of the BaBar and Belle experiments containing 471×106 and 772×106 BB pairs ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2018 Vol. 98 No. 11 P. 1-13
We present the result of the search for the rare B meson decay of B+→+νγ with =e,μ. For the search the full data set recorded by the Belle experiment of 711 fb-1 integrated luminosity near the (4S) resonance is used. Signal candidates are reconstructed for photon energies Eγ larger than 1 GeV using a novel ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2018 Vol. 98 No. 7 P. 1-17
We report the measurement of γγ→ηc(1S),ηc(2S)→η′π+π- with η′ decays to γρ and ηπ+π- using 941 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The ηc(1S) mass and width are measured to be M=[2984.6±0.7 (stat)±2.2 (syst)±0.3 (model)] MeV/c2 and Γ=[30.8-2.2+2.3 (stat)±2.5 (syst)±1.4 (model)] MeV, respectively. First observation of ηc(2S)→η′π+π- with ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Journal of High Energy Physics 2019 Vol. 2019 No. 10 P. 1-31
We present the first model-independent measurement of the CKM unitarity triangle angle ϕ3 using B±→ D(KS0π+π−π0) K± decays, where D indicates either a D0 or D¯ 0 meson. Measurements of the strong-phase difference of the D →KS0π+π−π0 amplitude obtained from CLEO-c data are used as input. This analysis is based on the full Belle data ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., The European Physical Journal C - Particles and Fields 2018 Vol. 78 No. 3 P. 1-8
We report the first observation of the Ξ c(2930) 0 charmed-strange baryon with a significance greater than 5σ. The Ξ c(2930) 0 is found in its decay to K-Λc+ in B-→K-Λc+Λ¯c- decays. The measured mass and width are [2928.9±3.0(stat.)-12.0+0.9(syst.)] MeV/c2 and [19.5±8.4(stat.)-7.9+5.9(syst.)] MeV, respectively, and the product branching fraction is B(B-→Ξc(2930)0Λ¯c-)B(Ξc(2930)0→K-Λc+)=[1.73±0.45(stat.)±0.21(syst.)]×10-4. We also measure B(B-→K-Λc+Λ¯c-)=[4.80±0.43(stat.)±0.60(syst.)]×10-4 with improved ...
Added: October 28, 2020
Aushev T., Pakhlova G., Mizuk R. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2018 Vol. 98 No. 9 P. 1-8
Using data samples of 89.5 fb-1, 711.0 fb-1, and 121.4 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at center-of-mass energies 10.52, 10.58, and 10.867 GeV, respectively, we study the exclusive reactions e+e-→γχcJ (J=0, 1, 2) and e+e-→γηc. A significant γχc1 signal is observed for the first time at s=10.58 GeV ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2018 Vol. 98 No. 7 P. 1-8
We have searched for the lepton-flavor-violating decay B0→K∗0μ±e using a data sample of 711 fb-1 that contains 772×106 BB̄ pairs. The data were collected near the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. No signals were observed, and we set 90% confidence level upper limits on the branching fractions of ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., The European Physical Journal C - Particles and Fields 2018 Vol. 78 No. 8 P. 1-10
We study bottomonium production in association with an η meson in e+e- annihilations near the Υ(5 S) , at a centre-of-mass energy of s=10.866 GeV. The results are based on the 121.4 fb- 1 data sample collected by the Belle experiment at the asymmetric-energy KEKB collider. Only the η meson is reconstructed and the missing-mass spectrum of ...
Added: October 28, 2020
Aushev T., Mizuk R., Pakhlov P. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2018 Vol. 98 No. 1 P. 1-9
We report a measurement of the branching fractions of the decays B→D(∗)πν. The analysis uses 772×106 BB. pairs produced in e+e-→(4S) data recorded by the Belle experiment at the KEKB asymmetric-energy e+e- collider. The tagging B meson in the decay is fully reconstructed in a hadronic decay mode. On the signal side, we reconstruct the ...
Added: October 28, 2020
Pakhlova G., Pakhlov P., Aushev T. et al., Physical Review D - Particles, Fields, Gravitation and Cosmology 2018 Vol. 97 No. 1 P. 1-21
We report a new measurement of the exclusive e+e-→D(∗)±D∗ cross sections as a function of the center-of-mass energy from the D(∗)±D∗ threshold through s=6.0 GeV, using the initial-state radiation technique. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of 951 fb-1. The accuracy of the cross ...
Added: October 28, 2020