Measurements of branching fractions and asymmetry parameters of $${\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}$$, $${\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}$$, and $${\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}$$ decays at Belle
A bstract Using a data sample of 980 fb − 1 collected with the Belle detector at the KEKB asymmetric-energy e + e − collider, we study the processes of $${\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}$$ Ξ c 0 → Λ K ¯ ∗ 0 , $${\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}$$ Ξ c 0 → Σ 0 K ¯ ∗ 0 , and $${\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}$$ Ξ c 0 → Σ + K ∗ − for the first time. The relative branching ratios to the normalization mode of $${\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}$$ Ξ c 0 → Ξ − π + are measured to be $${\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.18\pm 0.02\left(\mathrm{stat}.\right)\pm 0.01\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.69\pm 0.03\left(\mathrm{stat}.\right)\pm 0.03\left(\mathrm{syst}.\right),\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right)/\mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right)=0.34\pm 0.06\left(\mathrm{stat}.\right)\pm 0.02\left(\mathrm{syst}.\right),\end{array}}$$ B Ξ c 0 → Λ K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.18 ± 0.02 stat . ± 0.01 syst . , B Ξ c 0 → Σ 0 K ¯ ∗ 0 / B Ξ c 0 → Ξ − π + = 0.69 ± 0.03 stat . ± 0.03 syst . , B Ξ c 0 → Σ + K ∗ more »
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Award ID(s):
Publication Date:
NSF-PAR ID:
10304420
Journal Name:
Journal of High Energy Physics
Volume:
2021
Issue:
6
ISSN:
1029-8479
1. A bstract We measure the branching fractions and CP asymmetries for the singly Cabibbo-suppressed decays D 0 → π + π − η , D 0 → K + K − η , and D 0 → ϕη , using 980 fb − 1 of data from the Belle experiment at the KEKB e + e − collider. We obtain $${\displaystyle \begin{array}{c}\mathcal{B}\left({D}^0\to {\pi}^{+}{\pi}^{-}\eta \right)=\left[1.22\pm 0.02\left(\mathrm{stat}\right)\pm 0.02\left(\mathrm{syst}\right)\pm 0.03\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-3},\\ {}\mathcal{B}\left({D}^0\to {K}^{+}{K}^{-}\eta \right)=\left[{1.80}_{-0.06}^{+0.07}\left(\mathrm{stat}\right)\pm 0.04\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\\ {}\mathcal{B}\left({D}^0\to \phi \eta \right)=\left[1.84\pm 0.09\left(\mathrm{stat}\right)\pm 0.06\left(\mathrm{syst}\right)\pm 0.05\left({\mathcal{B}}_{\mathrm{ref}}\right)\right]\times {10}^{-4},\end{array}}$$ B D 0 → π + π − η = 1.22 ± 0.02 stat ± 0.02more »
2. A bstract The p T -differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity ( | y | < 0 . 5) in proton-proton collisions at $$\sqrt{s}$$ s = 5 . 02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19 . 3 ± 0 . 4) nb − 1 . D mesons were reconstructed from their decays D 0 → K − π + , D + → K − π + π + , and $${\mathrm{D}}_{\mathrm{s}}^{+}\tomore » 3. Abstract The production of$$\pi ^{\pm }$$π ± ,$$\mathrm{K}^{\pm }$$K ± ,$$\mathrm{K}^{0}_{S}$$K S 0 ,$$\mathrm{K}^{*}(892)^{0}$$K ∗ ( 892 ) 0 ,$$\mathrm{p}$$p ,$$\phi (1020)$$ϕ ( 1020 ) ,$$\Lambda $$Λ ,$$\Xi ^{-}$$Ξ - ,$$\Omega ^{-}$$Ω - , and their antiparticles was measured in inelastic proton–proton (pp) collisions at a center-of-mass energy of$$\sqrt{s}$$s = 13 TeV at midrapidity ($$|y|<0.5$$| y | < 0.5 ) as a function of transverse momentum ($$p_{\mathrm{T}}$$p T ) using the ALICE detector at the CERNmore » 4. Abstract. This work measured  \mathrm{d}\sigma/\mathrm{d}\Omega d σ / d Ω for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the  \gamma p\rightarrow K^0\Sigma^+ γ p → K 0 Σ + ,  \gamma n\rightarrow K^0\Lambda γ n → K 0 Λ , and  \gamma n\rightarrow K^0 \Sigma^0 γ n → K 0 Σ 0 reactions. Our results for  \gamma n\rightarrow K^0 \Sigma^0 γ n → K 0 Σ 0 are the first-ever measurements for that reaction. These data will provide insight into the properties of  N^{\ast} Nmore » 5. A bstract We present a search for the dark photon A ′ in the B 0 → A ′ A ′ decays, where A ′ subsequently decays to e + e − , μ + μ − , and π + π − . The search is performed by analyzing 772 × 10 6$$ B\overline{B}  B B ¯ events collected by the Belle detector at the KEKB e + e − energy-asymmetric collider at the ϒ(4 S ) resonance. No signal is found in the dark photon mass range 0 . 01 GeV /c 2 ≤ m Amore »