arXiv subjects

Daesung Hwang

Publications and source records attributed to Daesung Hwang.

3 recordsLinked to original sources

arXiv1994

Fermi motion parameter $p_F$ of $B$ meson from relativistic quark model

The Fermi motion parameter $p_{_F}$ is the most important parameter of ACCMM model, and the value $p_{_F} \sim 0.3$ GeV has been used without clear theoretical or experimental evidence. So, we attempted to extract the possible value for $p_{_F}$ theoretically in the relativistic quark model using quantum mechanical variational method. We obtained $p_{_F} \sim 0.5$ GeV, which is somewhat larger than 0.3, and we also derived the eigenvalue of $E_B \simeq 5.5$ GeV, which is is reasonable agreement with $m_B=5.28$ GeV.

hep-ph↗

arXiv1994

New Approach for Measuring $|V_{ub}|$ at Future $B$-Factories

It is suggested that the measurements of hadronic invariant mass ($m_X$) distributons in the inclusive $B \rightarrow X_{c(u)} l ν$ decays can be useful in extracting the CKM matrix element $|V_{ub}|$. We investigated hadronic invariant mass distributions within the various theoretical models of HQET, FAC and chiral lagrangian as well as ACCMM model. It is also emphasized that the $m_X$ distribution even at the region $m_{X} > m_{D}$ in the inclusive $b\rightarrow u$ are effetive in selecting the events, experimentally viable at the future asymmetric $B$ factories, with better theoretical understandings.

hep-ph↗

arXiv1994

Measuring $|V_{ub}|$ at future B-Factories

We calculate the so--called Fermi motion parameter $p_{_F}$ of ACCMM model using the variational method in a potential model approach. We also propose hadronic invariant mass distribution as an alternative experimental observable to measure $V_{ub}$ at future asymmetric $B$ factories.

hep-ph↗