Search for ${\Lambda }_c^{+}\to \varphi p{\pi }^0$ and branching fraction measurement of ${\Lambda }_c^{+}\to K^{-}{\pi }^{+}p{\pi }^0$

Abstract

We have searched for the Cabibbo-suppressed decay ${\Lambda }_c^{+}\to \varphi p{\pi }^0$ in $e^{+}{e}^{-}$ collisions using a data sample corresponding to an integrated luminosity of 915 $\mathrm{f}{\mathrm{b}}^{-1}$. The data were collected by the Belle experiment at the KEKB $e^{+}{e}^{-}$ asymmetric-energy collider running at or near the ${\rm Y}(4S)$ and ${\rm Y}(5S)$ resonances. No significant signal is observed, and we set an upper limit on the branching fraction of $\mathcal{B}({\Lambda }_c^{+}\to \varphi p{\pi }^0)<15.3\times 10^{-5}$ at 90% confidence level. The contribution for nonresonant ${\Lambda }_c^{+}\to K^{+}{K}^{-}p{\pi }^0$ decays is found to be consistent with zero and the corresponding upper limit on its branching fraction is set to be $\mathcal{B}({\Lambda }_c^{+}\to K^{+}{K}^{-}p{\pi }^0{)}_{\mathrm{NR}}<6.3\times 10^{-5}$ at 90% confidence level. We also measure the branching fraction for the Cabibbo-favored decay ${\Lambda }_c^{+}\to K^{-}{\pi }^{+}p{\pi }^0$; the result is $\mathcal{B}({\Lambda }_c^{+}\to K^{-}{\pi }^{+}p{\pi }^0)=(4.42\pm 0.05(stat.)\pm 0.12(syst.)\pm 0.16({\mathcal{B}}_{\mathrm{Norm}}))\%$, which is the most precise measurement to date. Finally, we have searched for an intermediate hidden-strangeness pentaquark decay $P_s^{+}\to \varphi p$. We see no evidence for this intermediate decay and set an upper limit on the product branching fraction of $\mathcal{B}({\Lambda }_c^{+}\to P_s^{+}{\pi }^0)\times \mathcal{B}(P_s^{+}\to \varphi p)<8.3\times 10^{-5}$ at 90% confidence level.

8 pages, 5 figures, 1 table, minor text change in version 2

References in corpus (2)

• Diffractive $\varphi$-meson photoproduction on proton near threshold
• Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction $\gamma p\to \varphi p$

Cited by in corpus (11)

• The scalar $f_0(500)$ and $f_0(980)$ resonances and vector mesons in the single Cabibbo-suppressed decays ${\Lambda }_c\to p{K}^{+}{K}^{-}$ and $p{\pi }^{+}{\pi }^{-}$
• Spectrum of the molecular pentaquarks
• Roles of $a_0(980)$, $\Lambda (1670)$, and $\Sigma (1385)$ in the ${\Lambda }_c^{+}\to \eta \Lambda {\pi }^{+}$ decay
• Observation of the Singly Cabibbo-Suppressed Decay ${\Lambda }_c^{+}\to n{\pi }^{+}$
• The $a_0(980)$ in the single Cabibbo-suppressed process ${\Lambda }_c\to {\pi }^0\eta p$
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Observation of ${\Lambda }_c^{+}\to \Lambda a_0(980{)}^{+}$ and Evidence for $\Sigma (1380{)}^{+}$ in ${\Lambda }_c^{+}\to \Lambda {\pi }^{+}\eta$
• Topological amplitudes of charmed baryon decays in the $SU(3{)}_F$ limit
• Measurement of the absolute branching fraction of the singly Cabibbo suppressed decay ${\Lambda }_c^{+}\to p{\eta }^{\prime }$
• The electromagnetic form factors of ${\Lambda }_c$ hyperon in the vector meson dominance model
• QCD sum rule study for hidden-strange pentaquarks