1,725,439 research outputs found
Measurements of psi(3686) -> k-lambda(Xi)over-bar(+) + c.c. and psi(3686) -> gamma k-lambda(xi)over-bar(+) + c.c.
No full textÇetin, Serkant Ali (Dogus Author)Using a sample of 1.06 x 10(8) psi(3686) events produced in e(+)e(-) collisions at root s = 3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays psi(3686) -> K-Lambda(Xi) over bar (+) + c.c. and psi(3686) -> gamma K-Lambda(Xi) over bar (+) + c.c. We observe two hyperons, Xi(1690)(-) and Xi(1820)(-), in the K-Lambda invariant mass distribution in the decay psi(3686) -> K-Lambda(Xi) over bar (+) + c.c. with significances of 4.9 sigma and 6.2 sigma, respectively. The branching fractions of psi(3686) -> K-Lambda(Xi) over bar (+) + c.c., psi(3686) -> K-Sigma(0)(Xi) over bar (+) + c.c, psi(3686) -> gamma chi cJ -> gamma K-Lambda(Xi) over bar (+) + c.c (J = 0, 1, 2), and psi(3686) -> Xi(1690/1820)(-)(Xi) over bar (+) + c.c with sub-sequent decay Xi(1690/1820)(-) -> K-Lambda are measured for the first time
Observation of ψ (3686) →n n ̄ and improved measurement of ψ (3686) →p p ̄
No full textKolcu, Onur Buğra (Arel Author)We observe the process psi(3686) -> p (p) over bar eta' for the first time, with a statistical significance higher than 10 sigma, and measure the branching fraction of J/psi -> p (p) over bar eta' with an improved accuracy compared to earlier studies. The measurements are based on 4.48 x 10(8) psi(3686) and 1.31 x 10(9) J/psi events collected by the BESIII detector operating at the BEPCII. The branching fractions are determined to be B(psi(3686) -> p (p) over bar eta') = (1.10 +/- 0.10 +/- 0.08) x 10(-5) and B(J/psi -> p (p) over bar eta' = (1.26 +/- 0.02 +/- 0.07) x 10(-4), where the first uncertainties are statistical and the second ones systematic. Additionally, the eta - eta' mixing angle is determined to be -24 degrees +/- 11 degrees based on psi(3686) -> p (p) over bar eta', and -24 degrees +/- 9 degrees based on J/psi -> p (p) over bar eta', respectively
Branching fraction measurements of psi (3686) -> gamma chi(cJ)
No full textKolcu, Onur Buğra (Arel Author)Using a sample of 106 million psi(3686) decays, the branching fractions of psi(3686) -> gamma chi(c0), psi(3686) -> gamma chi(c1), and psi(3686) -> gamma chi(c2) are measured with improved precision to be (9.389 +/- 0.014 +/- 0.332) %, (9.905 +/- 0.011 +/- 0.353) %, and (9.621 +/- 0.013 +/- 0.272) %, respectively, where the first uncertainties are statistical and the second ones are systematic. The product branching fractions of (psi 3686) -> gamma chi(c1), chi(c1) -> gamma J/psi (3686) -> gamma chi(c2), chi(c2) -> gamma J/psi and the branching fractions of chi(c1) -> gamma J/psi and chi(c2) -> gamma J/psi are also presented
Observation of psi(3686) -> eta ' e(+)e(-)
No full textKolcu, Onur Buğra (Arel Author)Using a data sample of 448.1 x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay psi(3686) -> eta'e(+)e(-), with significances of 7.0 sigma and 6.3 sigma when reconstructing the eta' meson via its decay modes eta' -> gamma pi(+)pi(-) and eta' -> pi(+)pi(-) eta (eta -> gamma gamma), respectively. The weighted average branching fraction is determined to be B(psi(3686) -> eta'e(+)e(-)) = (1.90 +/- 0.25 +/- 0.11) x 10(-6), where the first uncertainty is statistical and the second systematic. (C) 2018 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3)
Measurements of ? (3686) ?k- ? ? ¯ ++ c. c. and ? (3686) ??K- ? ? ¯ ++ c. c.
No full textUsing a sample of 1.06×108?(3686) events produced in e+e- collisions at s=3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays ?(3686)?K-??¯++c.c. and ?(3686)??K-??¯++c.c.. We observe two hyperons, ?(1690)- and ?(1820)-, in the K-? invariant mass distribution in the decay ?(3686)?K-??¯++c.c. with significances of 4.9? and 6.2?, respectively. The branching fractions of ?(3686)?K-??¯++c.c., ?(3686)?K-?0?¯++c.c., ?(3686)???cJ??K-??¯++c.c. (J=0, 1, 2), and ?(3686)??(1690/1820)-?¯++c.c. with subsequent decay ?(1690/1820)-?K-? are measured for the first time. © 2015 American Physical Society
Partial wave analyses of (3686) →¯0 and (3686) →¯
No full textUsing a sample of (2712 ±14) ×106 (3686) events collected with the BESIII detector, we perform partial wave analyses of the decays (3686) →¯0 and (3686) →¯. The branching fractions of (3686) →¯0 and (3686) →¯ are determined to be (133.9 ±11.2 ±2.3) ×10−6 or (183.7 ±13.7 ±3.2) ×10−6 and (61.5 ±6.5 ±1.1) ×10−6 or (84.4 ±6.9 ±1.4) ×10−6, respectively, where the two solutions are caused by an ambiguous phase angle between resonant and continuum processes. Several well-established * states are observed in the 0 and systems, and the corresponding branching fractions are measured. The ratio of decay widths Γ(1535)→/Γ(1535)→ is determined to be 0.99 ±0.05 ±0.19.For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.111.032011</p
Observation of psi(3686) -> eta ' e(+)e(-)
No full textUsing a data sample of 448.1 x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay psi(3686) -> eta'e(+)e(-), with significances of 7.0 sigma and 6.3 sigma when reconstructing the eta' meson via its decay modes eta' -> gamma pi(+)pi(-) and eta' -> pi(+)pi(-) eta (eta -> gamma gamma), respectively. The weighted average branching fraction is determined to be B(psi(3686) -> eta'e(+)e(-)) = (1.90 +/- 0.25 +/- 0.11) x 10(-6), where the first uncertainty is statistical and the second systematic. (C) 2018 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3)
Measurements of ψ(3686)→K−ΛΞ+ + c.c. and ψ(3686)→γK−ΛΞ+ + c.c.
No full textUsing a sample of 1.06×108ψ(3686) events produced in e+e− collisions at s√=3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays ψ(3686)→K−ΛΞ¯++c.c. and ψ(3686)→γK−ΛΞ¯++c.c.. We observe two hyperons, Ξ(1690)− and Ξ(1820)−, in the K−Λ invariant mass distribution in the decay (3686)→K−ΛΞ¯++c.c. with significances of 4.9σ and 6.2σ, respectively. The branching fractions of (3686)→K−ΛΞ¯++c.c., ψ(3686)→K−Σ0Ξ¯++c.c., ψ(3686)→γχcJ→γK−ΛΞ¯++c.c. (J=0, 1, 2), and ψ(3686)→Ξ(1690/1820)−Ξ¯++c.c. with subsequent decay Ξ(1690/1820)−→K−Λ are measured for the first time
Observation of psi(3686) -> eta ' e(+)e(-)
No full textUsing a data sample of 448.1 x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay psi(3686) -> eta'e(+)e(-), with significances of 7.0 sigma and 6.3 sigma when reconstructing the eta' meson via its decay modes eta' -> gamma pi(+)pi(-) and eta' -> pi(+)pi(-) eta (eta -> gamma gamma), respectively. The weighted average branching fraction is determined to be B(psi(3686) -> eta'e(+)e(-)) = (1.90 +/- 0.25 +/- 0.11) x 10(-6), where the first uncertainty is statistical and the second systematic. (C) 2018 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3)
Measurements of ψ(3686)→K−ΛΞ+ + c.c. and ψ(3686)→γK−ΛΞ+ + c.c.
No full textUsing a sample of 1.06×108ψ(3686) events produced in e+e− collisions at s√=3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays ψ(3686)→K−ΛΞ¯++c.c. and ψ(3686)→γK−ΛΞ¯++c.c.. We observe two hyperons, Ξ(1690)− and Ξ(1820)−, in the K−Λ invariant mass distribution in the decay (3686)→K−ΛΞ¯++c.c. with significances of 4.9σ and 6.2σ, respectively. The branching fractions of (3686)→K−ΛΞ¯++c.c., ψ(3686)→K−Σ0Ξ¯++c.c., ψ(3686)→γχcJ→γK−ΛΞ¯++c.c. (J=0, 1, 2), and ψ(3686)→Ξ(1690/1820)−Ξ¯++c.c. with subsequent decay Ξ(1690/1820)−→K−Λ are measured for the first time
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