On |V_{ub}| from the B -> X_u l νdilepton invariant mass spectrum
| dc.creator | Bauer, Christian W. | |
| dc.creator | Ligeti, Zoltan | |
| dc.creator | Luke, Michael | |
| dc.date | 2000-07-06 | |
| dc.date.accessioned | 2026-07-07T03:41:58Z | |
| dc.date.available | 2026-07-07T03:41:58Z | |
| dc.description | The invariant mass spectrum of the lepton pair in inclusive semileptonic $\bar B\to X_u \ell\barν$ decay yields a model independent determination of $|V_{ub}|$. Unlike the lepton energy and hadronic invariant mass spectra, nonperturbative effects are only important in the resonance region, and play a parametrically suppressed role when $dΓ/ dq^2$ is integrated over $q^2 > (m_B-m_D)^2$, which is required to eliminate the $\bar B\to X_c \ell\barν$ background. We discuss these backgrounds for $q^2$ slightly below $(m_B-m_D)^2$, and point out that instead of $q^2 > (m_B-m_D)^2 = 11.6 GeV^2$, the cut can be lowered to $q^2 \gtrsim 10.5 GeV^2$. This is important experimentally, particularly when effects of a finite neutrino reconstruction resolution are included. | |
| dc.description | 5 pages, 4 figures, uses moriond.sty, talk presented by Zoltan Ligeti at the 35th Rencontres de Moriond | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0007054 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0007054 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/39761 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | On |V_{ub}| from the B -> X_u l νdilepton invariant mass spectrum | |
| dc.type | text |