Measurement of η′→π+π-e+ e- and η′→π+π-μ+ μ-

M. Ablikim; M. N. Achasov; O. Albayrak; D. J. Ambrose; F. F. An; Q. An; J. Z. Bai; R. Baldini Ferroli; Y. Ban; J. Becker; J. V. Bennett; M. Bertani; J. M. Bian; E. Boger; O. Bondarenko; I. Boyko; R. A. Briere; V. Bytev; H. Cai; X. Cai; O. Cakir; A. Calcaterra; G. F. Cao; S. A. Cetin; J. F. Chang; G. Chelkov; G. Chen; H. S. Chen; J. C. Chen; M. L. Chen; S. J. Chen; X. Chen; Y. B. Chen; H. P. Cheng; Y. P. Chu; D. Cronin-Hennessy; H. L. Dai; J. P. Dai; D. Dedovich; Z. Y. Deng; A. Denig; I. Denysenko; M. Destefanis; W. M. Ding; Y. Ding; L. Y. Dong; M. Y. Dong; S. X. Du; H. Muramatsu; R. Poling; BESIII Collaboration

doi:10.1103/PhysRevD.87.092011

Measurement of η^′→π+^π-e+ ^e- and η^′→π+^π-μ+ ^μ-

M. Ablikim, M. N. Achasov, O. Albayrak, D. J. Ambrose, F. F. An, Q. An, J. Z. Bai, R. Baldini Ferroli, Y. Ban, J. Becker, J. V. Bennett, M. Bertani, J. M. Bian, E. Boger, O. Bondarenko, I. Boyko, R. A. Briere, V. Bytev, H. Cai, X. CaiO. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. J. Chen, X. Chen, Y. B. Chen, H. P. Cheng, Y. P. Chu, D. Cronin-Hennessy, H. L. Dai, J. P. Dai, D. Dedovich, Z. Y. Deng, A. Denig, I. Denysenko, M. Destefanis, W. M. Ding, Y. Ding, L. Y. Dong, M. Y. Dong, S. X. Du, H. Muramatsu, R. Poling, BESIII Collaboration

Physics and Astronomy (Twin Cities)

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Based on a sample of 225.3 million J/ψ events accumulated with the BESIII detector at the BEPCII, the decays of η^′→π ⁺π^-l⁺l^- are studied via J/ψ→γη^′. A clear η^′ signal is observed in the π⁺π^-e⁺e ^- mass spectrum, and the branching fraction is measured to be B(η^′→π⁺π^-e ⁺e^-)=(2.11±0.12(stat)±0.14(syst)) ×10^-3, which is in good agreement with theoretical predictions and the previous measurement, but is determined with much higher precision. No η^′ signal is found in the π⁺π ^-μ⁺μ^- mass spectrum, and the upper limit is determined to be B(η^′→π⁺π ^-μ⁺μ^-)<2.9×10^-5 at the 90% confidence level.

Original language	English (US)
Article number	092011
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	87
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevD.87.092011
State	Published - May 28 2013

Bibliographical note

Publisher Copyright:
© 2013 American Physical Society.

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10.1103/PhysRevD.87.092011

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Ablikim, M., Achasov, M. N., Albayrak, O., Ambrose, D. J., An, F. F., An, Q., Bai, J. Z., Baldini Ferroli, R., Ban, Y., Becker, J., Bennett, J. V., Bertani, M., Bian, J. M., Boger, E., Bondarenko, O., Boyko, I., Briere, R. A., Bytev, V., Cai, H., ... BESIII Collaboration (2013). Measurement of η^′→π+^π-e+ ^e- and η^′→π+^π-μ+ ^μ- Physical Review D - Particles, Fields, Gravitation and Cosmology, 87(9), Article 092011. https://doi.org/10.1103/PhysRevD.87.092011

Ablikim, M, Achasov, MN, Albayrak, O, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Baldini Ferroli, R, Ban, Y, Becker, J, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Bytev, V, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, YB, Cheng, HP, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, LY, Dong, MY, Du, SX, Muramatsu, H, Poling, R & BESIII Collaboration 2013, 'Measurement of η^′→π+^π-e+ ^e- and η^′→π+^π-μ+ ^μ- ', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 87, no. 9, 092011. https://doi.org/10.1103/PhysRevD.87.092011

@article{c318ab93bb0a4f0aa081c097205387e0,

title = "Measurement of η′→π+π-e+ e- and η′→π+π-μ+ μ- ",

abstract = "Based on a sample of 225.3 million J/ψ events accumulated with the BESIII detector at the BEPCII, the decays of η′→π +π-l+l- are studied via J/ψ→γη′. A clear η′ signal is observed in the π+π-e+e - mass spectrum, and the branching fraction is measured to be B(η′→π+π-e +e-)=(2.11±0.12(stat)±0.14(syst)) ×10-3, which is in good agreement with theoretical predictions and the previous measurement, but is determined with much higher precision. No η′ signal is found in the π+π -μ+μ- mass spectrum, and the upper limit is determined to be B(η′→π+π -μ+μ-)<2.9×10-5 at the 90% confidence level.",

author = "M. Ablikim and Achasov, {M. N.} and O. Albayrak and Ambrose, {D. J.} and An, {F. F.} and Q. An and Bai, {J. Z.} and {Baldini Ferroli}, R. and Y. Ban and J. Becker and Bennett, {J. V.} and M. Bertani and Bian, {J. M.} and E. Boger and O. Bondarenko and I. Boyko and Briere, {R. A.} and V. Bytev and H. Cai and X. Cai and O. Cakir and A. Calcaterra and Cao, {G. F.} and Cetin, {S. A.} and Chang, {J. F.} and G. Chelkov and G. Chen and Chen, {H. S.} and Chen, {J. C.} and Chen, {M. L.} and Chen, {S. J.} and X. Chen and Chen, {Y. B.} and Cheng, {H. P.} and Chu, {Y. P.} and D. Cronin-Hennessy and Dai, {H. L.} and Dai, {J. P.} and D. Dedovich and Deng, {Z. Y.} and A. Denig and I. Denysenko and M. Destefanis and Ding, {W. M.} and Y. Ding and Dong, {L. Y.} and Dong, {M. Y.} and Du, {S. X.} and H. Muramatsu and R. Poling and {BESIII Collaboration}",

note = "Publisher Copyright: {\textcopyright} 2013 American Physical Society.",

year = "2013",

month = may,

day = "28",

doi = "10.1103/PhysRevD.87.092011",

language = "English (US)",

volume = "87",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

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TY - JOUR

T1 - Measurement of η′→π+π-e+ e- and η′→π+π-μ+ μ-

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Albayrak, O.

AU - Ambrose, D. J.

AU - An, F. F.

AU - An, Q.

AU - Bai, J. Z.

AU - Baldini Ferroli, R.

AU - Ban, Y.

AU - Becker, J.

AU - Bennett, J. V.

AU - Bertani, M.

AU - Bian, J. M.

AU - Boger, E.

AU - Bondarenko, O.

AU - Boyko, I.

AU - Briere, R. A.

AU - Bytev, V.

AU - Cai, H.

AU - Cai, X.

AU - Cakir, O.

AU - Calcaterra, A.

AU - Cao, G. F.

AU - Cetin, S. A.

AU - Chang, J. F.

AU - Chelkov, G.

AU - Chen, G.

AU - Chen, H. S.

AU - Chen, J. C.

AU - Chen, M. L.

AU - Chen, S. J.

AU - Chen, X.

AU - Chen, Y. B.

AU - Cheng, H. P.

AU - Chu, Y. P.

AU - Cronin-Hennessy, D.

AU - Dai, H. L.

AU - Dai, J. P.

AU - Dedovich, D.

AU - Deng, Z. Y.

AU - Denig, A.

AU - Denysenko, I.

AU - Destefanis, M.

AU - Ding, W. M.

AU - Ding, Y.

AU - Dong, L. Y.

AU - Dong, M. Y.

AU - Du, S. X.

AU - Muramatsu, H.

AU - Poling, R.

AU - BESIII Collaboration

PY - 2013/5/28

Y1 - 2013/5/28

N2 - Based on a sample of 225.3 million J/ψ events accumulated with the BESIII detector at the BEPCII, the decays of η′→π +π-l+l- are studied via J/ψ→γη′. A clear η′ signal is observed in the π+π-e+e - mass spectrum, and the branching fraction is measured to be B(η′→π+π-e +e-)=(2.11±0.12(stat)±0.14(syst)) ×10-3, which is in good agreement with theoretical predictions and the previous measurement, but is determined with much higher precision. No η′ signal is found in the π+π -μ+μ- mass spectrum, and the upper limit is determined to be B(η′→π+π -μ+μ-)<2.9×10-5 at the 90% confidence level.

AB - Based on a sample of 225.3 million J/ψ events accumulated with the BESIII detector at the BEPCII, the decays of η′→π +π-l+l- are studied via J/ψ→γη′. A clear η′ signal is observed in the π+π-e+e - mass spectrum, and the branching fraction is measured to be B(η′→π+π-e +e-)=(2.11±0.12(stat)±0.14(syst)) ×10-3, which is in good agreement with theoretical predictions and the previous measurement, but is determined with much higher precision. No η′ signal is found in the π+π -μ+μ- mass spectrum, and the upper limit is determined to be B(η′→π+π -μ+μ-)<2.9×10-5 at the 90% confidence level.

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U2 - 10.1103/PhysRevD.87.092011

DO - 10.1103/PhysRevD.87.092011

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VL - 87

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

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