Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Zhen Xing Zhao"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 10, Pp 1-9 (2024)
Abstract In traditional QCD sum rules, the simple hadron spectral density model of the “delta-function-type ground state + theta-function-type continuous spectrum” determines that there is no perfect parameter selection. In recent years, inverse
Externí odkaz:
https://doaj.org/article/a506307bc6624e6f91d874d03a25fb23
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 1, Pp 1-8 (2024)
Abstract Heavy quark expansion can nicely explain the lifetime of $$\Lambda _{b}$$ Λ b . However, there still exist sizable uncertainties from the four-quark operator matrix elements of $$\Lambda _{b}$$ Λ b in $$1/m_{b}^{3}$$ 1 / m b 3 corrections,
Externí odkaz:
https://doaj.org/article/9a822f9b76bc4029b369b09dc6f5402d
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 10, Pp 1-10 (2023)
Abstract In this work, we perform a QCD sum rules analysis on $$\Xi _{Q}-\Xi _{Q}^{\prime }$$ Ξ Q - Ξ Q ′ mixing. Contributions from up to dimension-6 four-quark operators are considered. However, it turns out that only dimension-4 and dimension-
Externí odkaz:
https://doaj.org/article/0648fa4d51ea49349150dff26580f191
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 2, Pp 1-18 (2022)
Abstract In this work, we study the resonance contributions to the decay $$B^-\rightarrow K^+K^-\pi ^-$$ B - → K + K - π - , which is dominated by the scalar $$f_0(980), K_0^*(1430)$$ f 0 ( 980 ) , K 0 ∗ ( 1430 ) , vector $$\rho (1450), \phi (10
Externí odkaz:
https://doaj.org/article/0da5b6f37766442182a9d64bb3b9fba8
Autor:
Zhi-Peng Xing, Zhen-Xing Zhao
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 12, Pp 1-10 (2021)
Abstract A comprehensive study of $$b\rightarrow c$$ b → c weak decays of doubly heavy baryons is presented in this paper. The transition form factors as well as the pole residues of the initial and final states are respectively obtained by investi
Externí odkaz:
https://doaj.org/article/6dd5adc467d6491682c21e7555ad24a2
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 2, Pp 1-26 (2021)
Abstract We perform a SU(3) analysis for both semi-leptonic and non-leptonic heavy meson weak decays into a pseudoscalar meson and a fully-light tetraquark in 10 or 27 representation. A reduction of the SU(3) representation tensor for the fully-light
Externí odkaz:
https://doaj.org/article/fbb0ef7ebfc342748ec349ce2fb98d47
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 12, Pp 1-11 (2020)
Abstract In this work, the full leading order results of the form factors for $$\Xi _{b}\rightarrow \Xi _{c}$$ Ξ b → Ξ c and $$\Lambda _{b}\rightarrow \Lambda _{c}$$ Λ b → Λ c are obtained in QCD sum rules. Contributions from up to dimension-
Externí odkaz:
https://doaj.org/article/1bef9bb95a53438fb5104eb1906e17be
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 6, Pp 1-20 (2020)
Abstract We calculate the weak decay form factors of doubly-heavy baryons using three-point QCD sum rules. The Cutkosky rules are used to derive the double dispersion relations. We include perturbative contributions and condensation contributions up
Externí odkaz:
https://doaj.org/article/fbdccdb44eb145479ce5f5be8e74c9e5
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 5, Pp 1-16 (2020)
Abstract We construct a leading-order effective field theory for both scalar and axial-vector heavy diquarks, and consider its power expansion in the heavy diquark limit. By assuming the transition from QCD to diquark effective theory, we derive the
Externí odkaz:
https://doaj.org/article/767e306ea20d42758f060f62812ca211
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 6, Pp 1-13 (2019)
Abstract We analyze the weak decay of doubly-heavy baryon decays into anti-triplets $$\Lambda _Q$$ ΛQ with light-cone sum rules. To calculate the decay form factors, both bottom and charmed anti-triplets $$\Lambda _b$$ Λb and $$\Lambda _c$$ Λc are
Externí odkaz:
https://doaj.org/article/f92ea604de1743fbbdc702e2cbdb2c4c