Azimuthal asymmetries of back-to-back π±- (π0, η, π±) pairs in e+e- annihilation

(Belle Collaboration)

doi:10.1103/PhysRevD.100.092008

Azimuthal asymmetries of back-to-back π±- (π0, η, π±) pairs in e+e- annihilation

(Belle Collaboration)

Chair of Physics I

Indiana University Bloomington
Duke University
University of Tokyo
Brookhaven National Laboratory
Budker Institute of Nuclear Physics (SB RAS)
Novosibirsk State University
Moscow Institute of Physics and Technology
Deutsches Elektronen-Synchrotron (DESY)
King Abdulaziz City for Science and Technology
University of Tabuk
University of Sydney
University of Mississippi
Indian Institute of Science Education and Research Mohali
Charles University
Jožef Stefan Institute
University of Maribor
INFN Sezione di Napoli
Università di Napoli Federico II
Humanoid Technologies Lab (H2T)
Max-Planck-Institut für Physik
National Central University
Hanyang University
Korea Institute of Science and Technology Information
Sungkyunkwan University
Indian Institute of Technology Hyderabad
Wayne State University
Laboratoire de l'Accélérateur Linéaire
KEK and Graduate University for Advanced Studies (Sokendai)
High Energy Accelerator Research Organization (KEK)
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Pacific Northwest National Laboratory
Virginia Polytechnic Institute and State University
University of Hawaii
Niigata University
Nara Women's University
National Taiwan University
Nagoya University
Osaka Prefecture University
Gyeongsang National University
Beihang University
Kyungpook National University
Soongsil University
Univ. of Ljubljana
Yonsei University
Beijing University
Indian Institute of Technology Madras
University of Munich
Fudan University
School of Physics
University of Miyazaki
INFN Sez. di Torino
Osaka University
Kyoto University
Indian Institute of Technology Guwahati
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
Nippon Dental University
National Research Nuclear University MEPhI
Luther College, Decorah
Forschungszentrum Jülich (FZJ)
Tata Institute of Fundamental Research, Mumbai
Tohoku University
University of Pittsburgh
EPFL
Biodonostia Health Research Institute-CIBERNED-UPV-EHU
Basque Foundation for Science
Österreichische Akademie der Wissenschaften
Riken BNL Research Center
Yamagata University
Riken
Showa Pharmaceutical University
Japan Atomic Energy Agency
Tokyo Institute of Technology
National United University Taiwan
Institute of High Energy Physics Chinese Academy of Science
Korea University
University of Science and Technology of China

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19 Scopus citations

Abstract

This work reports the first observation of azimuthal asymmetries around the thrust axis in e+e- annihilation of pairs of back-to-back charged pions in one hemisphere, and π0 and η mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The π0 and η asymmetries rise with the relative momentum z of the detected hadrons as well as with the transverse momentum with respect to the thrust axis. These asymmetries are sensitive to the Collins fragmentation function H1¥ and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the η final states will provide additional information on the flavor structure of H1¥. This is the first measurement of the explicit transverse-momentum dependence of the Collins fragmentation function from Belle data. It uses a dataset of 980.4 fb-1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV.

Original language	English
Article number	092008
Journal	Physical Review D
Volume	100
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevD.100.092008
State	Published - 27 Nov 2019

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10.1103/PhysRevD.100.092008

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@article{1288ddc18a5046549bd92cc491453e3d,

title = "Azimuthal asymmetries of back-to-back π±- (π0, η, π±) pairs in e+e- annihilation",

abstract = "This work reports the first observation of azimuthal asymmetries around the thrust axis in e+e- annihilation of pairs of back-to-back charged pions in one hemisphere, and π0 and η mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The π0 and η asymmetries rise with the relative momentum z of the detected hadrons as well as with the transverse momentum with respect to the thrust axis. These asymmetries are sensitive to the Collins fragmentation function H1¥ and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the η final states will provide additional information on the flavor structure of H1¥. This is the first measurement of the explicit transverse-momentum dependence of the Collins fragmentation function from Belle data. It uses a dataset of 980.4 fb-1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV.",

author = "\{(Belle Collaboration)\} and H. Li and A. Vossen and H. Aihara and Asner, \{D. M.\} and V. Aulchenko and T. Aushev and V. Babu and I. Badhrees and Bakich, \{A. M.\} and J. Bennett and V. Bhardwaj and T. Bilka and J. Biswal and A. Bobrov and M. Bra{\v c}ko and M. Campajola and L. Cao and D. {\v C}ervenkov and V. Chekelian and A. Chen and Cheon, \{B. G.\} and Cho, \{H. E.\} and K. Cho and Y. Choi and S. Choudhury and D. Cinabro and S. Cunliffe and \{Di Capua\}, F. and \{Di Carlo\}, S. and Dong, \{T. V.\} and S. Eidelman and T. Ferber and Fulsom, \{B. G.\} and V. Gaur and A. Garmash and A. Giri and P. Goldenzweig and O. Hartbrich and K. Hayasaka and H. Hayashii and K. Huang and K. Inami and A. Ishikawa and R. Itoh and M. Iwasaki and Jacobs, \{W. W.\} and Jang, \{E. J.\} and S. Jia and Y. Jin and S. Paul",

note = "Publisher Copyright: {\textcopyright} 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"} Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.",

year = "2019",

month = nov,

day = "27",

doi = "10.1103/PhysRevD.100.092008",

language = "English",

volume = "100",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "9",

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TY - JOUR

T1 - Azimuthal asymmetries of back-to-back π±- (π0, η, π±) pairs in e+e- annihilation

AU - (Belle Collaboration)

AU - Li, H.

AU - Vossen, A.

AU - Aihara, H.

AU - Asner, D. M.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Babu, V.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Bennett, J.

AU - Bhardwaj, V.

AU - Bilka, T.

AU - Biswal, J.

AU - Bobrov, A.

AU - Bračko, M.

AU - Campajola, M.

AU - Cao, L.

AU - Červenkov, D.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Cho, H. E.

AU - Cho, K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - Di Capua, F.

AU - Di Carlo, S.

AU - Dong, T. V.

AU - Eidelman, S.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Garmash, A.

AU - Giri, A.

AU - Goldenzweig, P.

AU - Hartbrich, O.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Huang, K.

AU - Inami, K.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Jacobs, W. W.

AU - Jang, E. J.

AU - Jia, S.

AU - Jin, Y.

AU - Paul, S.

N1 - Publisher Copyright: © 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/" Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.

PY - 2019/11/27

Y1 - 2019/11/27

N2 - This work reports the first observation of azimuthal asymmetries around the thrust axis in e+e- annihilation of pairs of back-to-back charged pions in one hemisphere, and π0 and η mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The π0 and η asymmetries rise with the relative momentum z of the detected hadrons as well as with the transverse momentum with respect to the thrust axis. These asymmetries are sensitive to the Collins fragmentation function H1¥ and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the η final states will provide additional information on the flavor structure of H1¥. This is the first measurement of the explicit transverse-momentum dependence of the Collins fragmentation function from Belle data. It uses a dataset of 980.4 fb-1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV.

AB - This work reports the first observation of azimuthal asymmetries around the thrust axis in e+e- annihilation of pairs of back-to-back charged pions in one hemisphere, and π0 and η mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The π0 and η asymmetries rise with the relative momentum z of the detected hadrons as well as with the transverse momentum with respect to the thrust axis. These asymmetries are sensitive to the Collins fragmentation function H1¥ and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the η final states will provide additional information on the flavor structure of H1¥. This is the first measurement of the explicit transverse-momentum dependence of the Collins fragmentation function from Belle data. It uses a dataset of 980.4 fb-1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV.

UR - https://www.scopus.com/pages/publications/85076352739

U2 - 10.1103/PhysRevD.100.092008

DO - 10.1103/PhysRevD.100.092008

M3 - Article

AN - SCOPUS:85076352739

SN - 2470-0010

VL - 100

JO - Physical Review D

JF - Physical Review D

IS - 9

M1 - 092008

ER -

Azimuthal asymmetries of back-to-back π±- (π0, η, π±) pairs in e+e- annihilation

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