Study of the lineshape of X(3872) using B decays to D0(D)over-bar*0K

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10476396" target="_blank" >RIV/00216208:11320/23:10476396 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=iZNeJQdMy-" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=iZNeJQdMy-</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.107.112011" target="_blank" >10.1103/PhysRevD.107.112011</a>

Result language
angličtina
Original language name
Study of the lineshape of X(3872) using B decays to D0(D)over-bar*0K
Original language description
We present a study of the X(3872) lineshape in the decay B -> X(3872)K -> D-0(D) over bar*K-0 using a data sample of 772 x 10(6) B (B) over bar pairs collected at the Gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The peak near the threshold in the D-0(D) over bar*(0) invariant mass spectrum is fitted using a relativistic Breit-Wigner lineshape. We determine the mass and width parameters to be m(BW) = 3873.71(-0.50)(+0.56) (stat) +/- 0.13(syst) MeV/c(2) and Gamma(BW) = 5.2(-1.5)(+2.2) (stat) +/- 0.4(syst) MeV, respectively. The branching fraction is found to be B(B+ -> X(3872)K+) x B(X(3872) -> D-0(D) over bar*(0)) = (0.97(-0.18)(+0.21) (stat) +/- 0.10(syst)) x 10(-4). The signal from B-0 decays is observed for the first time with 5.2 sigma significance, and the ratio of branching fractions between charged and neutral B decays is measured to be B(B-0 -> X(3872)K-0)/B(B+ -> X(3872)K+) = 1.34(-0.40)(+0.47)(stat)(-0.12)(+0.10)(syst). The peak is also studied using a Flatte lineshape. We determine the lower limit on the D (D) over bar* coupling constant g to be 0.075 at 95% credibility in the parameter region where the ratio of g to the mass difference from the D-0(D) over bar*(0) threshold is equal to -15.11 GeV-1, as measured by LHCb.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/GA22-18469S" target="_blank" >GA22-18469S: Studies of the Beyond Standard Model phenomena in the flavor sector with the Belle II Experiment</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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