Laura++ : a Dalitz plot fitter

Back, John; Gershon, Tim; Harrison, Paul; Latham, Thomas; O'Hanlon, Daniel; Qian, Wenbin; Sanchez, Pablo del Amo; Craik, Daniel; Ilic, Jelena; Goicochea, Juan Martin Otalora; Puccio, Eugenia; Coutinho, Rafael Silva; Whitehead, Mark

doi:10.48550/arxiv.1711.09854

Cited by 10 publications

(16 citation statements)

References 102 publications

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“…The presence of intermediate resonances mean that the density of events depends on the location in the phase space. This model is generated using the Laura++ package [8].…”

Section: Modelmentioning

confidence: 99%

Calculating p-values and their significances with the Energy Test for large datasets

Barter

Burr²,

Parkes

2018

J. Inst.

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The energy test method is a multi-dimensional test of whether two samples are consistent with arising from the same underlying population, through the calculation of a single test statistic (called the T -value). The method has recently been used in particle physics to search for differences between samples that arise from CP violation. The generalised extreme value function has previously been used to describe the distribution of T -values under the null hypothesis that the two samples are drawn from the same underlying population. We show that, in a simple test case, the distribution is not sufficiently well described by the generalised extreme value function. We present a new method, where the distribution of T -values under the null hypothesis when comparing two large samples can be found by scaling the distribution found when comparing small samples drawn from the same population. This method can then be used to quickly calculate the p-values associated with the results of the test. arXiv:1801.05222v2 [physics.data-an]

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“…The presence of intermediate resonances mean that the density of events depends on the location in the phase space. This model is generated using the Laura++ package [8].…”

Section: Modelmentioning

confidence: 99%

Calculating p-values and their significances with the Energy Test for large datasets

Barter

Burr²,

Parkes

2018

J. Inst.

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“…The isobar coefficients and the lineshapes given in BaBar's papers are used to compute the amplitudes of the different decay modes as a function of position in the Dalitz plane. This calculation is implemented with the LAURA ++ software package [21]. The uncertainties on the isobar coefficients quoted by BaBar, and the associated correlation matrices, are used to compute the experimental uncertainties on the extracted values of the angle γ.…”

Section: Practical Implementation Of the Extraction Methodsmentioning

confidence: 99%

Extraction of the CKM phase γ using charmless three-body decays of B mesons

et al. 2019

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The weak phase γ is extracted from three-body charmless decays of B mesons following a method proposed by Bhattacharya, Imbeault & London. The result is obtained by combining the BaBar amplitude analyses for the processesunder the assumption of SU(3) flavour symmetry. Six possible solutions are found: γ1 = [ 12.9 +8.4 −4.3 (stat) ± 1.3 (syst)] • , γ2 = [ 36.6 +6.6 −6.1 (stat) ± 2.6 (syst)] • , γ3 = [ 68.9 +8.6 −8.6 (stat) ± 2.4 (syst)] • , γ4 = [223.2 +10.9 −7.5 (stat) ± 1.0 (syst)] • , γ5 = [266.4 +9.2 −10.8 (stat) ± 1.9 (syst)] • , γ6 = [307.5 +6.9 −8.1 (stat) ± 1.1 (syst)] • .One solution is compatible with the Standard Model while the others are not. It is also found that, when averaged over the entire Dalitz plane, the effect of SU(3) breaking on the analysis is only at the percent level.

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“…F S (ω) is the time-like form factor. In particular, for a narrow intermediate resonance, the time-like form factor F S (ω) can be well described by the relative Breit-Wigner lineshape [36]. However, due to the remarkable interference between two decays f 0 → ππ and f 0 → KK, the relative Breit-Wigner lineshape cannot work well for the time-like form factor of f 0 .…”

Section: Frameworkmentioning

confidence: 99%

“…However, due to the remarkable interference between two decays f 0 → ππ and f 0 → KK, the relative Breit-Wigner lineshape cannot work well for the time-like form factor of f 0 . In this case, the Flatté lineshape is proposed to describe that of f 0 [36,37], which is given as…”

Section: Frameworkmentioning

confidence: 99%

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Quasi-two-body $B_{(s)}\to V ππ$ Decays with Resonance $f_0(980)$ in PQCD Approach

Yang,

Zou,

et al. 2021

Preprint

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Motivated by the measurements of branching fractions of the quasi-two-body decays B 0 → K * 0 ( f 0 (980) →)π + π − and B 0 → ρ 0 ( f 0 (980) →)π + π − , we study the charmless B → V( f 0 (980) → )π + π − decays in the perturbative QCD approach. Supposing that f 0 (980) is a two-quark state and mixture of nn = (u ū + d d)/ √ 2 and s s with the mixing angle θ, we calculate the branching fractions of these decays with the new introduced s-wave π + π − -pair wave function. When the mixing angle θ lies in the range [135 • , 155 • ], the calculated branching fractions of the B 0 → K * 0 f 0 (980) → K * 0 π + π − and B 0 → ρ 0 f 0 (980) → ρ 0 π + π − decays are in agreement with the experimental data. The branching fractions of other decays could be measured in the current LHCb and Belle II experiments. Considering the isospin symmetry, we also estimate the branching fractions of the quasitwo-body decays B → V f 0 (980) → Vπ 0 π 0 , which are half of those the corresponding decays B → V f 0 (980) → Vπ + π − . Moreover, the direct CP asymmetries of these decays are also calculated, and some of them can be tested in the current experiments.

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Laura++ : a Dalitz plot fitter

Cited by 10 publications

References 102 publications

Calculating p-values and their significances with the Energy Test for large datasets

Calculating p-values and their significances with the Energy Test for large datasets

Extraction of the CKM phase γ using charmless three-body decays of B mesons

Quasi-two-body $B_{(s)}\to V ππ$ Decays with Resonance $f_0(980)$ in PQCD Approach

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