| dc.contributor.advisor | Frey, Ariane Prof. Dr. | |
| dc.contributor.author | Beleno de la Barrera, Cesar Augusto | |
| dc.date.accessioned | 2018-12-03T10:49:09Z | |
| dc.date.available | 2018-12-03T10:49:09Z | |
| dc.date.issued | 2018-12-03 | |
| dc.identifier.uri | http://hdl.handle.net/11858/00-1735-0000-002E-E51D-E | |
| dc.identifier.uri | http://dx.doi.org/10.53846/goediss-7172 | |
| dc.language.iso | eng | de |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | |
| dc.subject.ddc | 530 | de |
| dc.title | Measurement of B-> pi pi l nu with Full Hadronic Reconstruction at Belle | de |
| dc.type | doctoralThesis | de |
| dc.contributor.referee | Frey, Ariane Prof. Dr. | |
| dc.date.examination | 2018-10-01 | |
| dc.subject.gok | Physik (PPN621336750) | de |
| dc.description.abstracteng | This thesis presents an analysis of the exclusive $B\to\pi^{+}\pi^{-}\ell\nu_{\ell}$ decay, where $\ell$ represents an electron or a muon. The analysis uses the complete $\Upsilon(4S)$ data sample collected by the Belle detector, corresponding to 711 fb$^{-1}$. The events are selected by fully reconstructing one $B$ meson into hadronic decay modes, consequently the properties of the other $B$ meson, ''the signal $B$´´, can be inferred via conservation laws. The branching ratio is extracted by using an extended binned maximum likelihood method and measured to be ${{\cal B}(B^{+}\to \pi^{+}\pi^{-}\ell^{+}\nu_{\ell})= (2.24 \pm 0.19_{\mathrm{stat}} \pm 0.13_{\mathrm{syst}} )\times 10^{-4}}$. This result is the first reported measurement of this decay. The dominant resonance in the dipion mass spectrum is the $\rho^{0}$ meson, observed with a branching ratio of ${\cal B}(B^{+}\to \rho^{0} \ell^{+}\nu_{\ell})= (1.71 \pm 0.16_{\mathrm{stat}} \pm 0.10_{\mathrm{syst}})\times10^{-4}$. From this result, the magnitude of the CKM matrix element $V_{ub}$ is obtained as $|V_{ub}|=(3.56\pm0.17\pm 0.10\; {}^{+0.38}_{-0.25})\times 10^{-3}$, in agreement with the most precise measurement of this value from global fits to the $B\to\pi\ell\nu_{\ell}$ channel. Another resonance is reported with a product of branching ratios, ${\cal B}(B^{+}\to f_{2}(1270)\ell^{+}\nu)\times {\cal B}(f_{2}(1270)\to \pi^{+}\pi^{-})=(1.8 \pm 0.9_{\mathrm{stat}} {}^{+0.2}_{-0.1}{}_{\mathrm{syst}})\times 10^{-5}$, with a $2.2\sigma$ statistical significance without taking into account systematic uncertainties. | de |
| dc.contributor.coReferee | Dingfelder, Jochen Prof. Dr. | |
| dc.subject.eng | Semileptonic B decays, CKM matrix, Vub, resonances, branching ratios, charmless, rho0 meson, hadronic tag, full reconstruction | de |
| dc.identifier.urn | urn:nbn:de:gbv:7-11858/00-1735-0000-002E-E51D-E-1 | |
| dc.affiliation.institute | Fakultät für Physik | de |
| dc.identifier.ppn | 1041372442 | |