Evidence of a structure in $\bar{K}^{0} \Lambda _{c}^{+}$ consistent with a charged $\Xi _c(2930)^{+}$ , and updated measurement of $\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$ at Belle

Li, Y.B.; Shen, C.P.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D.M.; Aushev, T.; Ayad, R.; Babu, V.; Badhrees, I.

doi:10.1140/epjc/s10052-018-6425-5

Evidence of a structure in $\bar{K}^{0} \Lambda _{c}^{+}$ consistent with a charged $\Xi _c(2930)^{+}$ , and updated measurement of $\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$ at Belle

Belle

Collaboration

•

Y.B. Li
(
- Peking U.
)

Jun 24, 2018

8 pages

Published in:

Eur.Phys.J.C 78 (2018) 11, 928

Published: Nov 13, 2018

e-Print:

1806.09182 [hep-ex]

DOI:

10.1140/epjc/s10052-018-6425-5 (publication)

PDG:

{{\mathit \Xi}_{{{c}}}{(2930)}}

\rightarrow

{{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit K}_S^0}

Report number:

Belle Preprint # 2018-10; KEK Preprint # 2018-16,
BELLE-PREPRINT-2018-10,
KEK-PREPRINT-2018-16

Experiments:

KEK-BF-BELLE

View in:

reference search36 citations

Citations per year

Abstract: (Springer)

We report evidence for the charged charmed-strange baryon

\Xi _{c}(2930)^+

with a signal significance of 3.9

\sigma

with systematic errors included. The charged

\Xi _{c}(2930)^+

is found in its decay to

K_{S}^{0} \Lambda _{c}^+

in the substructure of

\bar{B}^{0} \rightarrow K^{0S} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}

decays. The measured mass and width are

[2942.3 \pm 4.4 ({\mathrm{stat.}}) \pm {1.5}({\mathrm{syst.}})]

MeV/

c^{2}

and

[14.8 \pm 8.8({\mathrm{stat.}}) \pm {2.5}({\mathrm{syst.}})]

MeV, respectively, and the product branching fraction is

\mathcal{B}(\bar{B}^{0} \rightarrow \Xi _c(2930)^{+} \bar{\Lambda }_{c}^{-}) \mathcal{B}(\Xi _c(2930)^{+}\rightarrow \bar{K}^{0} \Lambda _{c}^{+})=[2.37 \pm 0.51 ({\mathrm{stat.}})\pm 0.31({\mathrm{syst.}})]\times 10^{-4}

. We also measure

\mathcal{B}(\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}) = [3.99 \pm 0.76({\mathrm{stat.}}) \pm 0.51({\mathrm{syst.}})] \times 10^{-4}

with greater precision than previous experiments, and present the results of a search for the charmonium-like state Y(4660) and its spin partner,

Y_{\eta }

, in the

\Lambda _{c}^{+}\bar{\Lambda }_{c}^{-}

invariant mass spectrum. No clear signals of the Y(4660) or

Y_{\eta }

are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of

(772\pm 11)\times 10^{6} B\bar{B}

pairs collected at the

\Upsilon (4S)

resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.

Note:

8 pages, 5 figures

electron positron: annihilation
electron positron: colliding beams
B: pair production
Xi/c(2930): electroproduction
Xi/c(2930): hadronic decay
electron positron: energy
energy: asymmetry
Xi/c(2930): mass: measured
mass: width
B0: branching ratio: measured

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