2024/03/14 by Hu, Xiao-Hui, Jia, Cai-Ping, Xing, Ye +1
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2403.09511
In this study, we examine the non-leptonic weak decays of doubly charmed baryons, denoted as \cal Bcc→\cal BcP, where \cal Bcc represents the doubly charmed baryons, specifically (Ξcc++,Ξcc+,Ωcc+). The notation \cal Bc denotes the singly charmed baryons, specifically (\cal B_3,\cal B6), while P signifies the light pseudoscalar. These terms are pertinent to the non-leptonic decay modes under discussion. While the short-distance contributions can be precisely estimated through theoretical calculations, addressing the long-distance contributions for final-state-interaction effects presents a significant challenge. In order to address this issue, we utilize the rescattering mechanism of final state interaction effects to compute the long-distance contributions. We initially derive the entire hadronic loop contributions for these two-body nonleptonic decays of doubly charmed baryons. In subsequent analyses, we are able to calculate relative strong phases. As a result, we can provide predictions for their decay asymmetry parameters and CP violations. Furthermore, we employ experimental data from the LHCb collaboration, specifically the ratio \(Br(Ξcc++→Ξc′+π+)/Br(Ξcc++→Ξc+π+)=(1.41±0.17±0.10)\), to ascertain the model parameters \(η=0.9±0.2\). Consequently, we present the predictions of branching ratios and decay asymmetry parameters for 67 distinct decay processes and CP violations for the singly Cabibbo suppressed channels. This not only strengthens the validity of our theoretical predictions, but also provides a more comprehensive theoretical framework for the future identification of other doubly charmed baryons.