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
Authors:   The Belle collaboration, Jia S. , Tang S. S. , Shen C. P. , Adachi I. , Aihara H. , Al Said S. , Asner D. M. , Aulchenko V. , Aushev T. , Ayad R. , Babu V. , Bahinipati S. , Behera P. , Bennett J. , Bessner M. , Bilka T. , Biswal J. , Bobrov A. , Bonvicini G. , Bozek A. , Bračko M. , Browder T. E. , Campajola M. , Červenkov D. , Chang M.-C. , Chekelian V. , Chen A. , Cheon B. G. , Chilikin K. , Cho H. E. , Cho K. , Cho S.-J. , Choi S.-K. , Choi Y. , Choudhury S. , Cinabro D. , Cunliffe S. , Das S. , De Nardo G. , Dhamija R. , Di Capua F. , Doležal Z. , Dong T. V. , Eidelman S. , Epifanov D. , Ferber T. , Flood K. , Fulsom B. G. , Garg R. , Gaur V. , Gabyshev N. , Garmash A. , Giri A. , Goldenzweig P. , Hartbrich O. , Hayasaka K. , Hayashii H. , Hou W.-S. , Hsu C.-L. , Iijima T. , Inami K. , Ishikawa A. , Itoh R. , Iwasaki M. , Iwasaki Y. , Jacobs W. W. , Jin Y. , Joo K. K. , Karyan G. , Kato Y. , Kichimi H. , Kim C. H. , Kim D. Y. , Kim K.-H. , Kim S. H. , Kim Y.-K. , Kinoshita K. , Kodyš P. , Konno T. , Korobov A. , Korpar S. , Kovalenko E. , Križan P. , Kroeger R. , Krokovny P. , Kuhr T. , Kumara K. , Kuzmin A. , Kwon Y.-J. , Lalwani K. , Lange J. S. , Lee S. C. , Li J. , Li L. K. , Li Y. B. , Gioi L. Li , Libby J. , Lieret K. , Liventsev D. , MacQueen C. , Masuda M. , Matsuda T. , Matvienko D. , McNeil J. T. , Merola M. , Metzner F. , Miyabayashi K. , Miyata H. , Mizuk R. , Mohanty G. B. , Mussa R. , Nakao M. , Natochii A. , Nayak L. , Nayak M. , Niiyama M. , Nisar N. K. , Nishida S. , Nishimura K. , Ogawa K. , Ogawa S. , Ono H. , Onuki Y. , Oskin P. , Pakhlov P. , Pakhlova G. , Pardi S. , Park H. , Park S.-H. , Patra S. , Paul S. , Pestotnik R. , Piilonen L. E. , Podobnik T. , Popov V. , Prencipe E. , Prim M. T. , Rostomyan A. , Rout N. , Russo G. , Sahoo D. , Sandilya S. , Sangal A. , Savinov V. , Schnell G. , Schwanda C. , Seino Y. , Senyo K. , Sevior M. E. , Sharma C. , Shiu J.-G. , Sokolov A. , Solovieva E. , Starič M. , Stottler Z. S. , Sumihama M. , Sumiyoshi T. , Takizawa M. , Tanida K. , Tenchini F. , Trabelsi K. , Uehara S. , Uglov T. , Unno Y. , Uno K. , Uno S. , Urquijo P. , Usov Y. , Van Tonder R. , Varner G. , Waheed E. , Wang C. H. , Wang M.-Z. , Wang P. , Watanabe M. , Werbycka O. , Won E. , Yabsley B. D. , Yan W. , Yang S. B. , Ye H. , Yelton J. , Yin J. H. , Yuan C. Z. , Yusa Y. , Zhang Z. P. , Zhilich V. , Zhukova V. 
Published: July 2021

Abstract
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

∗
−

/
B

Ξ
c
0

→

Ξ
−

π
+

=
0.34
±
0.06

stat
.

±
0.02

syst
.

,

where the uncertainties are statistical and systematic, respectively. We obtain$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right)=\left(3.3\pm 0.3\left(\mathrm{stat}.\right)\pm 0.2\left(\mathrm{syst}.\right)\pm 1.0\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{\overline{K}}^{\ast 0}\right)=\left(12.4\pm 0.5\left(\mathrm{stat}.\right)\pm 0.5\left(\mathrm{syst}.\right)\pm 3.6\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\\ {}\mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast 0}\right)=\left(6.1\pm 1.0\left(\mathrm{stat}.\right)\pm 0.4\left(\mathrm{syst}.\right)\pm 1.8\left(\mathrm{ref}.\right)\right)\times {10}^{-3},\end{array}} $$

B

Ξ
c
0

→
Λ

K
¯

∗
0

=

3.3
±
0.3

stat
.

±
0.2

syst
.

±
1.0

ref
.

×

10

−
3

,

B

Ξ
c
0

→

Σ
0

K
¯

∗
0

=

12.4
±
0.5

stat
.

±
0.5

syst
.

±
3.6

ref
.

×

10

−
3

,

B

Ξ
c
0

→

Σ
+

K

∗
0

=

6.1
±
1.0

stat
.

±
0.4

syst
.

±
1.8

ref
.

×

10

−
3

,

where the uncertainties are statistical, systematic, and from $$ \mathcal{B}\left({\Xi}_c^0\to {\Xi}^{-}{\pi}^{+}\right) $$
B

Ξ
c
0

→

Ξ
−

π
+

, respectively. The asymmetry parameters $$ \alpha \left({\Xi}_c^0\to \Lambda {\overline{K}}^{\ast 0}\right) $$
α

Ξ
c
0

→
Λ

K
¯

∗
0

and $$ \alpha \left({\Xi}_c^0\to {\Sigma}^{+}{K}^{\ast -}\right) $$
α

Ξ
c
0

→

Σ
+

K

∗
−

are 0.15 ± 0.22(stat.) ± 0.04(syst.) and −0.52 ± 0.30(stat.) ± 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic.