Measurement of the Decays $\Lambda_c\to \Sigma\pi\pi$ at Belle
26 Nov 2018 · Belle Collaboration, Berger M., Schwanda C., Suzuki K., Adachi I., Ahn J. K., Aihara H., Said S. Al, Asner D. M., Atmacan H., Aulchenko V., Aushev T., Ayad R., Babu V., Badhrees I., Bakich A. M., Bansal V., Behera P., Bhardwaj V., Bhuyan B., Biswal J., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chen A., Cheon B. G., Chilikin K., Cho K., Choi Y., Cinabro D., Czank T., Dash N., Di Carlo S., Doležal Z., Dutta D., Eidelman S., Epifanov D., Fast J. E., Ferber T., Fulsom B. G., Garg R., Gaur V., Gabyshev N., Garmash A., Gelb M., Giri A., Goldenzweig P., Grzymkowska O., Guan Y., Guido E., Haba J., Hara T., Hayasaka K., Hayashii H., Hedges M. T., Hou W. -S., Iijima T., Inami K., Inguglia G., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Jacobs W. W., Jaegle I., Jia S., Jin Y., Joo K. K., Julius T., Kaliyar A. B., Kang K. H., Karyan G., Kawasaki T., Kichimi H., Kiesling C., Kim D. Y., Kim H. J., Kim J. B., Kim K. T., Kim S. H., Kinoshita K., Kodyš P., Korpar S., Kotchetkov D., Križan P., Kroeger R., Krokovny P., Kuhr T., Kulasiri R., Kuzmin A., Kwon Y. -J., Lee I. S., Lee S. C., Li L. K., Li Y., Gioi L. Li, Libby J., Liventsev D., Lubej M., Luo T., Masuda M., Matsuda T., Matvienko D., Merola M., Miyabayashi K., Miyata H., Mizuk R., Mohanty G. B., Moon H. K., Mori T., Mussa R., Nakano T., Nakao M., Nanut T., Nath K. J., Natkaniec Z., Nayak M., Niiyama M., Nisar N. K., Nishida S., Okuno S., Ono H., Onuki Y., Pakhlov P., Pakhlova G., Pal B., Park H., Paul S., Pavelkin I., Pedlar T. K., Pestotnik R., Piilonen L. E., Popov V., Ritter M., Rostomyan A., Russo G., Sakai Y., Salehi M., Sandilya S., Santelj L., Sanuki T., Savinov V., Schneider O., Schnell G., Schwartz A. J., Seino Y., Senyo K., Seon O., Sevior M. E., Shebalin V., Shen C. P., Shibata T. -A., Shimizu N., Shiu J. -G., Shwartz B., Simon F., Sokolov A., Solovieva E., Starič M., Strube J. F., Sumihama M., Sumiyoshi T., Takizawa M., Tamponi U., Tanida K., Tenchini F., Uchida M., Uglov T., Unno Y., Uno S., Urquijo P., Usov Y., Van Hulse C., Varner G., Varvell K. E., Vinokurova A., Vorobyev V., Vossen A., Wang B., Wang C. H., Wang M. -Z., Wang P., Wang X. L., Watanabe M., Watanabe Y., Widmann E., Won E., Ye H., Yelton J., Yuan C. Z., Yusa Y., Zakharov S., Zhang Z. P., Zhilich V., Zhukova V., Zhulanov V., Zupanc A. ·
We report measurements of the branching fractions of the decays $\Lambda^+_c\to\Sigma^+\pi^-\pi^+$, $\Lambda^+_c\to\Sigma^0\pi^+\pi^0$ and $\Lambda^+_c\to\Sigma^+\pi^0\pi^0$ relative to the reference channel $\Lambda^+_c\to pK^-\pi^+$. The analysis is based on the full data sample collected at and close to $\Upsilon(4S)$ resonance by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider corresponding to the integrated luminosity of 711 fb$^{-1}$. We measure ${\cal B}(\Lambda^+_c\rightarrow\Sigma^+\pi^-\pi^+)/{\cal B}(\Lambda^+_c\to pK^-\pi^+) = 0.706~\pm 0.003~\pm 0.029$, ${\cal B}(\Lambda^+_c\rightarrow\Sigma^0\pi^+\pi^0)/{\cal B}(\Lambda^+_c\to pK^-\pi^+) = 0.491~\pm 0.005~\pm 0.028$ and ${\cal B}(\Lambda^+_c\rightarrow\Sigma^+\pi^0\pi^0)/{\cal B}(\Lambda^+_c\to pK^-\pi^+) = 0.198~\pm 0.006~\pm 0.016$. The listed uncertainties are statistical and systematic, respectively.
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