1,721,871 research outputs found
Observation of χc0 → ς+ ς ¯ -η and evidence for χc1,2 → ς+ ς ¯ -η
No full textUsing (27.12±0.14)×108 ψ(3686) events collected with the BESIII detector, the decay χc0→ς+ς¯-η is observed for the first time with a signal significance of 7.0σ, and evidence for χc1→ς+ς¯-η and χc2→ς+ς¯-η is found with signal significances of 4.3σ and 4.6σ, respectively. The branching fractions are determined to be B(χc0→ς+ς¯-η)=(1.26±0.20±0.13)×10-4, B(χc1→ς+ς¯-η)=(5.10±1.21±0.67)×10-5, and B(χc2→ς+ς¯-η)=(5.46±1.18±0.50)×10-5, where the first uncertainties are statistical, and the second ones are systematic
Observation of the ψ (3686) decays into ς+ ς ¯ -ω and ς+ ς ¯ -φ
No full textBased on (2712.4±14.3)×106 events recorded at the ψ(3686) nominal mass collected with the BESIII detector operating at the BEPCII collider, the ψ(3686)→ς+ς¯-ω and ς+ς¯-φ decays are observed for the first time with statistical significances of 13.8σ and 7.6σ, respectively. The corresponding branching fractions are measured to be B(ψ(3686)→ς+ς¯-ω)=(1.89±0.18±0.21)×10-5 and B(ψ(3686)→ς+ς¯-φ)=(2.96±0.54±0.41)×10-6, where the first uncertainties are statistical and the second systematic.<br/
Measurements of branching fractions of Λc+ → ς+η and Λc+ → ς+η′ and asymmetry parameters of Λc+ → ς+π0, Λc+ → ς+η, and Λc+ → ς+η′
No full textWe report a study of Λc+→ς+π0, Λc+→ς+η, and Λc+→ς+η′ using the data sample corresponding to an integrated luminosity of 980 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fractions relative to Λc+→ς+π0 are measured as BΛc+→ς+η/BΛc+→ς+π0=0.25±0.03±0.01 and BΛc+→ς+η′/BΛc+→ς+π0=0.33±0.06±0.02. Using BΛc+→ς+π0=(1.25±0.10)%, we obtain BΛc+→ς+η=(3.14±0.35±0.17±0.25)×10-3 and BΛc+→ς+η′=(4.16±0.75±0.25±0.33)×10-3. Here the uncertainties are statistical, systematic, and from BΛc+→ς+π0, respectively. The ratio of the branching fraction of Λc+→ς+η′ with respect to that of Λc+→ς+η is measured to be BΛc+→ς+η′/BΛc+→ς+η=1.34±0.28±0.08. We update the asymmetry parameter of Λc+→ς+π0, ας+π0=-0.48±0.02±0.02, with a considerably improved precision. The asymmetry parameters of Λc+→ς+η and Λc+→ς+η′ are measured to be ας+η=-0.99±0.03±0.05 and ας+η′=-0.46±0.06±0.03 for the first time
Zeros of ς"(s) & ς′′′(s) in σ < ½
No full textThere is only one pair of non-real zeros of ς"(s), and of ς′′′(s), in the left half-plane. The Riemann Hypothesis implies that ς"(s) and ς′′′(s) have no zeros in the strip 0 ≤ Rs < ½. 19991 Mathematics Subject Classi cation. Primary 11M26
Observation of the J /ψ and ψ (3686) decays into η ς+ ς ¯ -
No full textThe decays J/ψ→ης+ς¯- and ψ(3686)→ης+ς¯- are observed for the first time, using (10087±44)×106 J/ψ and (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider. We determine the branching fractions of these two decays to be B(J/ψ→ης+ς¯-)=(6.34±0.21±0.37)×10-5 and B(ψ(3686)→ης+ς¯-)=(9.59±2.37±0.61)×10-6, where the first uncertainties are statistical and the second are systematic. The ratio of these two branching fractions is determined to be B(ψ(3686)→ης+ς¯-)B(J/ψ→ης+ς¯-)=(15.1±3.8)%, which is in agreement with the "12% rule.
Lower and upper bounds of ς(3)
No full textIn this short note, using refinements of Jordan’s inequality and an integral expression of ς(3), the lower and upper bounds of ς(3) are obtained, and some related results are improved
The functions of οὕτω(ς) in the Homeric Poems
No full textEn los Poemas Homéricos οὕτω(ς) se emplea, por
lo general, como adverbio de Modo; funciona, por
tanto, como complemento del predicado verbal,
como modificador de otro complemento o como
predicado de oraciones copulativas. Sin embargo,
también se observan pasajes en los que el adverbio
admite un análisis como marcador del discurso.
El presente trabajo analiza todos los ejemplos de
οὕτω(ς) en Homero y propone una explicación de
los usos del adverbio como marcador del discurso a
partir de su uso como adverbio prototípicoIn the Homeric Poems οὕτω(ς) is usually employed
as a Manner adverb which may play the role of
complement of the predicate, modifier of a complement
or predicate in copulative clauses. However,
in some occasions, οὕτω(ς) can be interpreted as a
discourse marker. This paper focuses on the analysis
of οὕτω(ς) in Homer and attempts to explain
how its employment as a discourse marker evolves
from its uses as a prototypical adver
First direct measurement of the absolute branching fraction of ς+ → Λe+νe
No full textThe first direct measurement of the absolute branching fraction of ς+→Λe+νe is reported based on an e+e- annihilation sample of (10087±44)×106 J/ψ events collected with the BESIII detector at s=3.097 GeV. The branching fraction is determined to be B(ς+→Λe+νe)=[2.93±0.74(stat)±0.13(syst)]×10-5, which is the most precise measurement obtained in a single experiment to date and also the first result obtained at a collider experiment. Combining this result with the world average of B(ς-→Λe-ν¯e) and the lifetimes of ς±, the ratio, Γ(ς-→Λe-ν¯e)Γ(ς+→Λe+νe), is determined to be 1.06±0.28, which is within 1.8 standard deviations of the value expected in the absence of second-class currents
Determination of the ς+ Timelike Electromagnetic Form Factors
No full textBased on data samples collected with the BESIII detector at the BEPCII collider, the process e+e-→ς+ς¯- is studied at center-of-mass energies s=2.3960, 2.6454, and 2.9000 GeV. Using a fully differential angular description of the final state particles, both the relative magnitude and phase information of the ς+ electromagnetic form factors in the timelike region are extracted. The relative phase between the electric and magnetic form factors is determined to be sinΔφ=-0.67±0.29(stat)±0.18(syst) at s=2.3960 GeV, Δφ=55°±19°(stat)±14°(syst) at s=2.6454 GeV, and 78°±22°(stat)±9°(syst) at s=2.9000 GeV. For the first time, the phase of the hyperon electromagnetic form factors is explored in a wide range of four-momentum transfer. The evolution of the phase along with four-momentum transfer is an important input for understanding its asymptotic behavior and the dynamics of baryons. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.<br/
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