서지주요정보
Decays of $B_c$ meson = $B_c$ 메존의 붕괴
서명 / 저자 Decays of $B_c$ meson = $B_c$ 메존의 붕괴 / Myoung-Taek Choi.
저자명 Choi, Myoung-Taek ; 최명택
발행사항 [대전 : 한국과학기술원, 1997].
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소장정보

등록번호

8007538

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 97008

SMS전송

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초록정보

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.

서지기타정보

서지기타정보
청구기호 {DPH 97008
형태사항 iii, 73 p. : 삽도 ; 26 cm
언어 영어
일반주기 Appendix : A, Quark models. - B, Event and detector
저자명의 한글표기 : 최명택
지도교수의 영문표기 : Jae-Kwan Kim
지도교수의 한글표기 : 김재관
수록잡지명 : "Inclusive semileptonic decays of the Bc meson". Physical Review D. Americal Physical Society, vol. 53, pp. 6670-6673
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 Reference : p. 59-63
주제 메존
붕괴
무거운 쿼크
편극
Meson
Decay
Heavy quark
Polarization
QR CODE qr code