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Observation of Transverse $Λ/\barΛ$ Hyperon Polarization in $e^+e^-$ Annihilation at Belle

Publication ,  Journal Article
Collaboration, TB; Abdesselam, A; Adachi, I; Adamczyk, K; Aihara, H; Said, SA; Arinstein, K; Arita, Y; Asner, DM; Aso, T; Atmacan, H; Ayad, R ...
November 21, 2016

We report the first observation of the polarization of $\Lambda/\bar{\Lambda}$ hyperons transverse to its production plane in $e^+e^-$ annihilation. We observe a significant polarization that rises with the fractional energy carried by the hyperon as well as its transverse momentum. To define the production plane, we use the direction of the hyperon momentum together with either the thrust axis in the event or the momentum vector of a hadron in the opposite hemisphere. Furthermore, we investigate the contributions to the hyperon polarization from the feed-down from $\Sigma^0/\bar{\Sigma}^0$ and $\Lambda_c^{\pm}$ decays. This measurement uses a dataset of 800.4\~fb$^{-1}$ collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV.

Duke Scholars

Publication Date

November 21, 2016
 

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Collaboration, T. B., Abdesselam, A., Adachi, I., Adamczyk, K., Aihara, H., Said, S. A., … Zwahlen, N. (2016). Observation of Transverse $Λ/\barΛ$ Hyperon Polarization in $e^+e^-$ Annihilation at Belle.
Collaboration, The Belle, A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara, S Al Said, K. Arinstein, et al. “Observation of Transverse $Λ/\barΛ$ Hyperon Polarization in $e^+e^-$ Annihilation at Belle,” November 21, 2016.
Collaboration TB, Abdesselam A, Adachi I, Adamczyk K, Aihara H, Said SA, et al. Observation of Transverse $Λ/\barΛ$ Hyperon Polarization in $e^+e^-$ Annihilation at Belle. 2016 Nov 21;
Collaboration TB, Abdesselam A, Adachi I, Adamczyk K, Aihara H, Said SA, Arinstein K, Arita Y, Asner DM, Aso T, Atmacan H, Aulchenko V, Aushev T, Ayad R, Aziz T, Babu V, Badhrees I, Bahinipati S, Bakich AM, Bala A, Ban Y, Bansal V, Barberio E, Barrett M, Bartel W, Bay A, Behera P, Belhorn M, Belous K, Berger M, Besson D, Bhardwaj V, Bhuyan B, Biswal J, Bloomfield T, Blyth S, Bobrov A, Bondar A, Bonvicini G, Bookwalter C, Boulahouache C, Bozek A, Bračko M, Breibeck F, Brodzicka J, Browder TE, Waheed E, Červenkov D, Chang M-C, Chang P, Chao Y, Chekelian V, Chen A, Chen K-F, Chen P, Cheon BG, Chilikin K, Chistov R, Cho K, Chobanova V, Choi S-K, Choi Y, Cinabro D, Crnkovic J, Dalseno J, Danilov M, Dash N, Carlo SD, Dingfelder J, Doležal Z, Dossett D, Drásal Z, Drutskoy A, Dubey S, Dutta D, Dutta K, Eidelman S, Epifanov D, Farhat H, Fast JE, Feindt M, Ferber T, Frey A, Frost O, Fulsom BG, Gaur V, Gabyshev N, Ganguly S, Garmash A, Getzkow D, Gillard R, Giordano F, Glattauer R, Goh YM, Goldenzweig P, Golob B, Greenwald D, Perdekamp MG, Grygier J, Grzymkowska O, Guan Y, Guo H, Haba J, Hamer P, Han YL, Hara K, Hara T, Hasegawa Y, Hasenbusch J, Hayasaka K, Hayashii H, He XH, Heck M, Hedges MT, Heffernan D, Heider M, Heller A, Higuchi T, Himori S, Hirose S, Horiguchi T, Hoshi Y, Hoshina K, Hou W-S, Hsiung YB, Hsu C-L, Huschle M, Hyun HJ, Igarashi Y, Iijima T, Imamura M, Inami K, Inguglia G, Ishikawa A, Itagaki K, Itoh R, Iwabuchi M, Iwasaki M, Iwasaki Y, Iwata S, Jacobs WW, Jaegle I, Jeon HB, Jin Y, Joffe D, Jones M, Joo KK, Julius T, Kakuno H, Kaliyar AB, Kang JH, Kang KH, Kapusta P, Kataoka SU, Kato E, Kato Y, Katrenko P, Kawai H, Kawasaki T, Keck T, Kichimi H, Kiesling C, Kim BH, Kim DY, Kim HJ, Kim H-J, Kim JB, Kim JH, Kim KT, Kim MJ, Kim SH, Kim SK, Kim YJ, Kinoshita K, Kleinwort C, Klucar J, Ko BR, Kobayashi N, Koblitz S, Kodyš P, Koga Y, Korpar S, Kotchetkov D, Kouzes RT, Križan P, Krokovny P, Kronenbitter B, Kuhr T, Kulasiri R, Kumar R, Kumita T, Kurihara E, Kuroki Y, Kuzmin A, Kvasnička P, Kwon Y-J, Lai Y-T, Lange JS, Lee DH, Lee IS, Lee S-H, Leitgab M, Leitner R, Levit D, Lewis P, Li CH, Li H, Li J, Li L, Li X, Li Y, Gioi LL, Libby J, Limosani A, Liu C, Liu Y, Liu ZQ, Liventsev D, Loos A, Louvot R, Lubej M, Lukin P, Luo T, MacNaughton J, Masuda M, Matsuda T, Matvienko D, Matyja A, McOnie S, Mikami Y, Miyabayashi K, Miyachi Y, Miyake H, Miyata H, Miyazaki Y, Mizuk R, Mohanty GB, Mohanty S, Mohapatra D, Moll A, Moon HK, Mori T, Morii T, Moser H-G, Müller T, Muramatsu N, Mussa R, Nagamine T, Nagasaka Y, Nakahama Y, Nakamura I, Nakamura KR, Nakano E, Nakano H, Nakano T, Nakao M, Nakayama H, Nakazawa H, Nanut T, Nath KJ, Natkaniec Z, Nayak M, Nedelkovska E, Negishi K, Neichi K, Ng C, Niebuhr C, Niiyama M, Nisar NK, Nishida S, Nishimura K, Nitoh O, Nozaki T, Ogawa A, Ogawa S, Ohshima T, Okuno S, Olsen SL, Ono Y, Onuki Y, Ostrowicz W, Oswald C, Ozaki H, Pakhlov P, Pakhlova G, Pal B, Palka H, Panzenböck E, Park C-S, Park CW, Park H, Park KS, Paul S, Peak LS, Pedlar TK, Peng T, Pesántez L, Pestotnik R, Peters M, Petrič M, Piilonen LE, Poluektov A, Prasanth K, Prim M, Prothmann K, Pulvermacher C, Purohit MV, Rauch J, Reisert B, Ribežl E, Ritter M, Rorie J, Rostomyan A, Rozanska M, Rummel S, Ryu S, Sahoo H, Saito T, Sakai K, Sakai Y, Sandilya S, Santel D, Santelj L, Sanuki T, Sasaki J, Sasao N, Sato Y, Savinov V, Schlüter T, Schneider O, Schnell G, Schönmeier P, Schram M, Schwanda C, Schwartz AJ, Schwenker B, Seidl R, Seino Y, Semmler D, Senyo K, Seon O, Seong IS, Sevior ME, Shang L, Shapkin M, Shebalin V, Shen CP, Shibata T-A, Shibuya H, Shimizu N, Shinomiya S, Shiu J-G, Shwartz B, Sibidanov A, Simon F, Singh JB, Sinha R, Smerkol P, Sohn Y-S, Sokolov A, Soloviev Y, Solovieva E, Stanič S, Starič M, Steder M, Strube JF, Stypula J, Sugihara S, Sugiyama A, Sumihama M, Sumisawa K, Sumiyoshi T, Suzuki K, Suzuki S, Suzuki SY, Suzuki Z, Takeichi H, Takizawa M, Tamponi U, Tanaka M, Tanaka S, Tanida K, Taniguchi N, Taylor GN, Tenchini F, Teramoto Y, Tikhomirov I, Trabelsi K, Trusov V, Tsuboyama T, Uchida M, Uchida T, Uehara S, Ueno K, Uglov T, Unno Y, Uno S, Uozumi S, Urquijo P, Ushiroda Y, Usov Y, Vahsen SE, Hulse CV, Vanhoefer P, Varner G, Varvell KE, Vervink K, Vinokurova A, Vorobyev V, Vossen A, Wagner MN, Wang CH, Wang J, Wang M-Z, Wang P, Wang XL, Watanabe M, Watanabe Y, Wedd R, Wehle S, White E, Widmann E, Wiechczynski J, Williams KM, Won E, Yabsley BD, Yamada S, Yamamoto H, Yamaoka J, Yamashita Y, Yamauchi M, Yashchenko S, Ye H, Yelton J, Yook Y, Yuan CZ, Yusa Y, Zhang CC, Zhang LM, Zhang ZP, Zhao L, Zhilich V, Zhukova V, Zhulanov V, Ziegler M, Zivko T, Zupanc A, Zwahlen N. Observation of Transverse $Λ/\barΛ$ Hyperon Polarization in $e^+e^-$ Annihilation at Belle. 2016 Nov 21;

Publication Date

November 21, 2016