Revisiting lifetimes of doubly charmed baryons

Abstract

Abstract 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 .