Systematic analysis of doubly charmed baryons $$\Xi _{cc}$$ and $$\Omega _{cc}$$
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Cited by 10 publications
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We present updated predictions for lifetimes of doubly charmed baryons, within the heavy quark expansion, including available NLO αs contributions and newly-computed terms in the 1/mc series. Our improved results confirm the expected hierarchy$$ \tau \left({\Xi}_{cc}^{+}\right)<\tau \left({\Omega}_{cc}^{+}\right)<\tau \left({\Xi}_{cc}^{++}\right), $$ τ Ξ cc + < τ Ω cc + < τ Ξ cc + + , while the predicted lifetime $$ \tau \left({\Xi}_{cc}^{++}\right) $$ τ Ξ cc + + = 0.32 ±$$ {0.5}_{-0.7}^{+0.8} $$ 0.5 − 0.7 + 0.8 ps is consistent with the recent LHCb determination. We provide predictions for the lifetime ratios of the $$ {\Xi}_{cc}^{+} $$ Ξ cc + and $$ {\Omega}_{cc}^{+} $$ Ω cc + baryons relative to the $$ {\Xi}_{cc}^{++} $$ Ξ cc + + baryon, namely $$ \tau \left({\Xi}_{cc}^{+}\right)/\tau \left({\Xi}_{cc}^{++}\right) $$ τ Ξ cc + / τ Ξ cc + + = 0.22 ± 0.05 ± 0.04 and $$ \tau \left({\Omega}_{cc}^{+}\right)/\tau \left({\Xi}_{cc}^{++}\right) $$ τ Ω cc + / τ Ξ cc + + = 0.52 ±$$ {0.13}_{-0.02}^{+0.03} $$ 0.13 − 0.02 + 0.03 .
We present updated predictions for lifetimes of doubly charmed baryons, within the heavy quark expansion, including available NLO αs contributions and newly-computed terms in the 1/mc series. Our improved results confirm the expected hierarchy$$ \tau \left({\Xi}_{cc}^{+}\right)<\tau \left({\Omega}_{cc}^{+}\right)<\tau \left({\Xi}_{cc}^{++}\right), $$ τ Ξ cc + < τ Ω cc + < τ Ξ cc + + , while the predicted lifetime $$ \tau \left({\Xi}_{cc}^{++}\right) $$ τ Ξ cc + + = 0.32 ±$$ {0.5}_{-0.7}^{+0.8} $$ 0.5 − 0.7 + 0.8 ps is consistent with the recent LHCb determination. We provide predictions for the lifetime ratios of the $$ {\Xi}_{cc}^{+} $$ Ξ cc + and $$ {\Omega}_{cc}^{+} $$ Ω cc + baryons relative to the $$ {\Xi}_{cc}^{++} $$ Ξ cc + + baryon, namely $$ \tau \left({\Xi}_{cc}^{+}\right)/\tau \left({\Xi}_{cc}^{++}\right) $$ τ Ξ cc + / τ Ξ cc + + = 0.22 ± 0.05 ± 0.04 and $$ \tau \left({\Omega}_{cc}^{+}\right)/\tau \left({\Xi}_{cc}^{++}\right) $$ τ Ω cc + / τ Ξ cc + + = 0.52 ±$$ {0.13}_{-0.02}^{+0.03} $$ 0.13 − 0.02 + 0.03 .
Surveying the mass spectra and the electromagnetic properties of the
Ξ c ( ′ , * ) D ( * )
Motivated by the observed PψsΛ(4459)/PψsΛ(4338) and Tcc(3875)+ states as the ΞcD¯*/ΞcD¯ and DD* molecular candidates, respectively, in this work we investigate the Ξc(′,*)D(*) molecular systems. We obtain the mass spectra and the corresponding spatial wave functions of the Ξc(′,*)D(*)-type double-charm molecular pentaquark candidates with single strangeness, where we utilize the one-boson-exchange model and take into account both the S−D wave-mixing effect and the coupled-channel effect. Our results show that the most promising candidates of the double-charm molecular pentaquarks with single strangeness include the ΞcD state with I(JP)=0(1/2−), the Ξc′D state with I(JP)=0(1/2−), the ΞcD* states with I(JP)=0(1/2−,3/2−), the Ξc*D state with I(JP)=0(3/2−), the Ξc′D* states with I(JP)=0(1/2−,3/2−), and the Ξc*D* states with I(JP)=0(1/2−,3/2−,5/2−). To gain further insight into the inner structures and the properties of the isoscalar Ξc(′,*)D(*) molecular candidates, we utilize the constituent quark model to analyze their M1 radiative decay behaviors and magnetic moments based on the obtained mass spectra and spatial wave functions, which can offer significant information to determine their spin-parity quantum numbers and configurations in the forthcoming experiments. We suggest that our experimental colleagues search for the predicted Ξc(′,*)D(*) molecular states. Published by the American Physical Society 2024
We analyze the two-body nonleptonic weak decays of charmed baryons, employing the pole approximation in tandem with the SU(3)F symmetry. We are able to make novel predictions for decay channels of Ωc0→BnP and Bcc→BcA,SP based on the experimental data of BcA→BnP. Here, Bn, BcA, BcS, and Bcc are the low-lying octet, antitriplet charmed, sextet charmed and doubly charmed baryons, respectively, and P is the pseudoscalar meson. Our findings reveal that the fitted effective Wilson coefficient C+=0.469 is notably smaller than the naïve expectation, and the low-lying pole approximation fails to account for B(Λc+→nπ+,Ξ0K+), despite consistencies with the soft meson limit. We further recommend the decay channel Ξcc+→Ξc0π+→Ξ−π+π+π+π− for exploring evidence of Ξcc+, estimating the branching fraction at (1.1±0.6)×10−3. Published by the American Physical Society 2024
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