Search for hadronic b→u decays

Observation of the DecayBs0→K0K¯0

“…As this control sample has only modest statistics, the resolutions for M bc , ∆E, and C NN , and the peak position for C NN , are adjusted for data-MC differences using a high statistics sample of B 0 → D − (→ K + π − π − )π + decays. For qq background, the M bc , ∆E, and C NN PDFs are modeled with an AR-GUS function [16], a first-order Chebyshev polynomial, and a Gaussian function, respectively. All parameters of the qq background PDFs except for the endpoint of the ARGUS function are floated in the fit.…”

Measurement of branching fractions and charge asymmetries for two-bodyBmeson decays with charmonium

“…The fit of the M bc distribution is performed with the sum of a Gaussian for signal and the ARGUS function [11] for background ( Figure 4). The resolution in M bc is dominated by the energy spread of KEKB.…”

Measurements of branching fractions and time-dependentCPviolating asymmetries inB0→D(*)±Röhrken1, Adachi2, Aihara3 et al. 2012Phys. Rev. DSelf Cite181100View full textAdd to dashboardCite

“…The M bc distributions are parameterized by a Gaussian function for the signal component and by an empirically determined threshold function introduced by the ARGUS Collaboration [22] for the background component. The ∆E distributions are parameterized by the sum of two Gaussian functions (the sum of a Gaussian function and an empirically determined function introduced by the Crystal Ball Collaboration [23]) with common mean for the signal component in The contributions of such decays, referred to as peaking background, are estimated from D mass sidebands and subtracted in the signal yields given above.…”