DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Jae-Kwan | - |
dc.contributor.advisor | 김재관 | - |
dc.contributor.author | Choi, Myoung-Taek | - |
dc.contributor.author | 최명택 | - |
dc.date.accessioned | 2011-12-14T07:27:15Z | - |
dc.date.available | 2011-12-14T07:27:15Z | - |
dc.date.issued | 1997 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=112576&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/47557 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 물리학과, 1997.2, [ iii, 73 p. ] | - |
dc.description.abstract | We investigate the decays of $B_c$ meson which is a bound state of $\bar{b}$- and $c$-quark. Quite large number of $B_c$ mesons are expected to be produced in next collider, like LHC. The $B_c$ meson is a source of interesting physics. It will provide unique probe of both strong and weak interactions, and a challenge to understand the effects of strong interactions on the underlying weak decays. Since the hadronic structure is very different from the light-light or heavy-light quarks bound mesons, the system probes different sector of QCD interaction. The electron energy spectra and decay widths of inclusive semileptonic decays of $B_c$ meson are studied in the ACCMM model. We obtain the value of the Fermi motion parameter $p_F$ using quantum mechanical variational method. We find that the decay widths are significantly affected by the bound state effects inside the $B_c$ meson. As a result the semileptonic decay rate of $B_c$ through c-quark decay is about the same as that through b-quark decay. Using the heavy-quark spin symmetry, we study the decay widths of experimentally feasible decay modes of $B_c$ meson. The degree of polarization of the vector particle strongly influences the momentum spectrum of the decay particles as well as the decay rate. We will show that $|V_{cb}|$ quark mixing-matrix element can be determined from the measurement of polarization of vector meson. Especially it is stressed that the measurement of polarization of J/ψ meson in $\bar{B_c}→J/ψ l \bar{ⅴ_l}$ decay process, followed by $J/ψ→l^+ l^-$, will play a special role to extract $|V_{cb}|$ due to experimentally clean signature. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | 무거운 쿼크 | - |
dc.subject | 편극 | - |
dc.subject | Meson | - |
dc.subject | Decay | - |
dc.subject | Heavy quark | - |
dc.subject | Polarization | - |
dc.subject | 메존 | - |
dc.subject | 붕괴 | - |
dc.title | Decays of $B_c$ meson | - |
dc.title.alternative | $B_c$ 메존의 붕괴 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 112576/325007 | - |
dc.description.department | 한국과학기술원 : 물리학과, | - |
dc.identifier.uid | 000925379 | - |
dc.contributor.localauthor | Choi, Myoung-Taek | - |
dc.contributor.localauthor | 최명택 | - |
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