K. Negishi (Author), Jyoti Prakash Biswal (Author), Marko Bračko (Author), Boštjan Golob (Author), Samo Korpar (Author), Peter Križan (Author), Luka Šantelj (Author), Anže Zupanc (Author), Tara Nanut (Author), Rok Pestotnik (Author), Marko Petrič (Author), Eva Ribežl (Author), Samo Stanič (Author), Marko Starič (Author)

Abstract

We report a measurement of the amplitude ratio $r_S$ of $B^0 \to D^0K^{\ast 0}$ and $B^0 \to \bar {D^0}K^{\ast 0}$ decays with a Dalitz analysis of $D\to K_S^0\pi ^+\pi ^-$ decays, for the first time using a model-independent method. We set an upper limit $r_S < 0.87$ at the 68% confidence level, using the full data sample of $711\,{\rm fb}^{-1}$ corresponding to $772\times 10^6$ $B\bar {B}$ pairs collected at the $\Upsilon (4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. This result is obtained from observables $x_- = +0.4 ^{+1.0 +0.0}_{-0.6 -0.1} \pm 0.0$, $y_- = -0.6 ^{+0.8 +0.1}_{-1.0 -0.0} \pm 0.1$, $x_+ = +0.1 ^{+0.7 +0.0}_{-0.4 -0.1} \pm 0.1$, and $y_+ = +0.3 ^{+0.5 +0.0}_{-0.8 -0.1} \pm 0.1$, where $x_\pm = r_S \cos (\delta _S \pm \phi _3)$, $y_\pm = r_S \sin (\delta _S \pm \phi _3)$, and $\phi _3\ (\delta _S)$ is the weak (strong) phase difference between $B^0 \to D^0K^{\ast 0}$ and $B^0 \to \bar {D^0}K^{\ast 0}$.

Keywords

CO2;CO3;Cabibbo-Kobayashi-Maskawa quark-mixing matrix;CP violation;experimental particle physics;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
UDC: 539.1
COBISS: 29823527 Link will open in a new window
ISSN: 2050-3911
Views: 966
Downloads: 160
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Other data

Secondary language: Slovenian
Secondary keywords: CO2;C03;matrika Cabibbo-Kobayashi-Maskawa;matrika CKM;kršitev simetrije CP;eksperimentalna fizika delcev;
URN: URN:SI:UM:
Type (COBISS): Scientific work
Pages: str. 043C01-1-043C01-16
Volume: ǂVol. ǂ2016
Chronology: 2016
DOI: 10.1093/ptep/ptw030
ID: 10850528