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Register a new user$boldsymbol{Omega_b^- to (Xi_c^+ , K^-) , pi^-}$ and the $boldsymbol{Omega_c}$ states
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Vinicius Rodrigues Debastiani
Publication date
2018
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English
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We study the weak decay $Omega_b^- to (Xi_c^+ , K^-) , pi^-$, in view of the narrow $Omega_c$ states recently measured by the LHCb collaboration and later confirmed by the Belle collaboration. The $Omega_c(3050)$ and $Omega_c(3090)$ are described as meson-baryon molecular states, using an extension of the local hidden gauge approach in coupled channels. We investigate the $Xi D$, $Xi_c bar K$ and $Xi_c^prime bar K$ invariant mass distributions making predictions that could be confronted with future experiments, providing useful information that could help determine the quantum numbers and nature of these states.
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The first observation of the $Omega_b^-toXi_c^+ K^- pi^-$ decay is reported using proton-proton collision data at centre-of-mass energies of $7$, $8$ and $13,mathrm{TeV}$ collected by the LHCb experiment, corresponding to an integrated luminosity of $9,mathrm{fb}^{-1}$. Four excited $Omega_c^0$ baryons are observed in the $Xi_c^+ K^-$ mass projection of the $Omega_b^-toXi_c^+ K^- pi^-$ decays with significance exceeding five standard deviations. Their relative production rates, masses and natural widths are measured, and a test of spin hypotheses is performed. Moreover, the branching ratio of $Omega_b^-toXi_c^+ K^- pi^-$ is measured relative to the $Omega_b^-to Omega_c^0 pi^-$ decay mode and a precise measurement of the $Omega_b^-$ mass of $6044.3 pm 1.2 pm 1.1^{,+0.19}_{,-0.22},mathrm{MeV}$ is obtained.
A simple analysis of time-dependent $B_sto K^+K^-$ transitions, based on recent results from the LHCb experiment, is presented. The benefits of adopting a fully consistent theoretical description of the $B^0_s$--$bar B^0_s$ mixing are stressed. It is shown that bounds on CPT violation in the $B^0_s$--$bar B^0_s$ system can be consistently obtained and that direct CP violation in $B_sto K^+K^-$ can be robustly established, even in the presence of CPT violation in the mixing.
The $Xi_c^+ K^-$ mass spectrum is studied with a sample of $pp$ collision data corresponding to an integrated luminosity of 3.3 fb$^{-1}$, collected by the LHCb experiment. The $Xi_c^+$ is reconstructed in the decay mode $p K^- pi^+$. Five new, narrow excited $Omega_c^0$ states are observed: the $Omega_c(3000)^0$, $Omega_c(3050)^0$, $Omega_c(3066)^0$, $Omega_c(3090)^0$, and $Omega_c(3119)^0$. Measurements of their masses and widths are reported.
We report on a Rosenbluth separation using previously published data by the CLAS collaboration in Hall B, Jefferson Lab for exclusive $pi^{0}$ deeply virtual electroproduction (DVEP) from the proton at a mean $Q^{2}$ of $approx$ 2 (GeV/c)$^{2}$. The central question we address is the applicability of factorization in $pi^0$ DVEP at these kinematics. The results of our Rosenbluth separation clearly demonstrate the dominance of the longitudinal contribution to the cross section. The extracted longitudinal and transverse contributions are in agreement with previous data from Hall A at Jefferson Lab, but over a much wider $-t$ range (0.12 - 1.8 (GeV/c)$^{2}$). The measured dominance of the longitudinal contribution at $Q^{2} approx$ 2 (GeV/c)$^{2}$ is consistent with the expectation of the handbag factorization theorem. We find that $sigma_L(t) sim 1/(-t)$ for $-t >$ 0.5 (GeV/c)$^2$. Determination of both longitudinal and transverse contributions to the deeply virtual $pi^{0}$ electroproduction cross section allows extraction of additional GPDs.
We report the first measurement of the $T$-odd moments in the decay $D^{0} rightarrow K_{S}^{0} pi^{+} pi^{-} pi^{0}$ from a data sample corresponding to an integrated luminosity of $966,{rm fb}^{-1}$ collected by the Belle experiment at the KEKB asymmetric-energy $e^+ e^-$ collider. From these moments we determine the $CP$-violation-sensitive asymmetry $a_{CP}^{Ttext{-odd}} = left[-0.28 pm 1.38 ~(rm{stat.}) ^{+0.23}_{-0.76} ~(rm{syst.})right] times 10^{-3}$, which is consistent with no $CP$ violation. In addition, we perform $a_{CP}^{Ttext{-odd}}$ measurements in different regions of the $D^{0} rightarrow K_{S}^{0} pi^{+} pi^{-} pi^{0}$ phase space; these are also consistent with no $CP$ violation.
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