Determination of the total absorption peak in an electromagnetic calorimeter

Cheng, J. H.; Wang, Zhe; Lebanowski, L.; Lin, Guey-Lin; Chen, Shaomin

doi:10.1016/j.nima.2016.05.010

Cited by 26 publications

(13 citation statements)

References 26 publications

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“…The corresponding uncertainties are estimated with alternative fits with different signal shapes, i.e. a Breit-Wigner function convolved with a Gaussian function for Λ and with a crystal ball function [32] for Σ 0 , where the Gaussian function and crystal ball function represent the corresponding mass resolutions. The uncertainties related with the peaking backgrounds, which are estimated with the exclusive MC samples in the nominal fits, are studied by changing the branching fractions of the individual background, or by changing the branching fractions for the reference decays which the estimated branching fractions for the undetermined backgrounds are based on, by AE1 times their uncertainties from the PDG [15].…”

Section: Systematic Uncertainty a Branching Fractionmentioning

confidence: 99%

Study of J/ψ and ψ(3686) decay to Λ
Ablikim¹,
Ачасов²,
Ahmed³
et al. 2017
Phys. Rev. D

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Using 1310.6 × 10 6 J=ψ and 447.9 × 10 6 ψð3686Þ events collected with the BESIII detector at the BEPCII e þ e − collider, the branching fractions and the angular distributions of J=ψ and ψð3686Þ decays to ΛΛ and Σ 0Σ0 final states are measured. The branching fractions are determined, with much improved precision, to be 19.43 AE 0.03 AE 0.33, 11.64 AE 0.04 AE 0.23, 3.97 AE 0.02 AE 0.12 and 2.44 AE 0.03 AE 0.11 for J=ψ → ΛΛ, J=ψ → Σ 0Σ0 , ψð3686Þ → ΛΛ and ψð3686Þ → Σ 0Σ0 , respectively. The polar angular distributions of ψð3686Þ decays are measured for the first time, while those of J=ψ decays are measured with much improved precision. In addition, the ratios of branching fractions Bðψð3686Þ→ΛΛÞBðJ=ψ→ΛΛÞ and Bðψð3686Þ→Σ 0Σ0 Þ BðJ=ψ→Σ 0Σ0 Þ are determined to test the "12% rule."

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Section: Systematic Uncertainty a Branching Fractionmentioning

confidence: 99%

Study of J/ψ and ψ(3686) decay to Λ
Ablikim¹,
Ачасов²,
Ahmed³
et al. 2017
Phys. Rev. D

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“…In such analyses, a general solution to minimize any bias of the fitted central value is to use the 'calorimeter function' described in Ref. [24].…”

Section: Partial Energy Depositionmentioning

confidence: 99%

An efficient energy response model for liquid scintillator detectors

Lebanowski

Wan

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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Liquid scintillator detectors are playing an increasingly important role in lowenergy neutrino experiments. In this article, we describe a generic energy response model of liquid scintillator detectors that provides energy estimations of sub-percent accuracy. This model fits a minimal set of physically-motivated parameters that capture the essential characteristics of scintillator response and that can naturally account for changes in scintillator over time, helping to avoid associated biases or systematic uncertainties. The model employs a one-step calculation and look-up tables, yielding an immediate estimation of energy and an efficient framework for quantifying systematic uncertainties and correlations.

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“…2. The number of peaking background events in the π 0 signal region is expected to be 32 AE 2, which is estimated by a fit to the γγ invariant mass spectrum of the above MC sample, where the π 0 signal is modeled with the sum of a Crystal Ball (CB) [30] function and a Gaussian function, and the other J=ψ nonpeaking background is described with a second order Chebychev polynomial function.…”

Section: Cmentioning

confidence: 99%

Study of two-photon decays of pseudoscalar mesons via J/ψ radiative decays

Ablikim¹,

Ачасов²,

Ahmed³

et al. 2018

Phys. Rev. D

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Using a sample of 4.48 × 10 8 ψð3686Þ events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons π 0 , η, η 0 , ηð1405Þ, ηð1475Þ, ηð1760Þ, and Xð1835Þ in J=ψ radiative decays using ψð3686Þ → π þ π − J=ψ events. The π 0 , η, and η 0 mesons are clearly observed in the two-photon mass spectra, and the branching fractions are determined to be BðJ=ψ → γπ 0 → 3γÞ ¼ ð3.57 AE 0.12 AE 0.16Þ × 10 −5 , BðJ=ψ → γη → 3γÞ ¼ ð4.42 AE 0.04 AE 0.18Þ × 10 −4 , and BðJ=ψ → γη 0 → 3γÞ ¼ ð1.26 AE 0.02 AE 0.05Þ × 10 −4 , where the first error is statistical and the second is systematic. No clear signal for ηð1405Þ, ηð1475Þ, ηð1760Þ or Xð1835Þ is observed in the two-photon mass spectra, and upper limits at the 90% confidence level on the product branching fractions are obtained.

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Determination of the total absorption peak in an electromagnetic calorimeter

Cited by 26 publications

References 26 publications

Study of J/ψ and ψ(3686) decay to Λ
Ablikim¹,
Ачасов²,
Ahmed³
et al. 2017
Phys. Rev. D

Study of J/ψ and ψ(3686) decay to Λ
Ablikim¹,
Ачасов²,
Ahmed³
et al. 2017
Phys. Rev. D

An efficient energy response model for liquid scintillator detectors

Study of two-photon decays of pseudoscalar mesons via J/ψ radiative decays

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Determination of the total absorption peak in an electromagnetic calorimeter

Cited by 26 publications

References 26 publications

Study of J/ψ and ψ(3686) decay to ΛAblikim1, Ачасов2, Ahmed3 et al. 2017Phys. Rev. D

Study of J/ψ and ψ(3686) decay to ΛAblikim1, Ачасов2, Ahmed3 et al. 2017Phys. Rev. D

An efficient energy response model for liquid scintillator detectors

Study of two-photon decays of pseudoscalar mesons via J/ψ radiative decays

Contact Info

Product

Resources

About

Study of J/ψ and ψ(3686) decay to Λ
Ablikim¹,
Ачасов²,
Ahmed³
et al. 2017
Phys. Rev. D

Study of J/ψ and ψ(3686) decay to Λ
Ablikim¹,
Ачасов²,
Ahmed³
et al. 2017
Phys. Rev. D