Evidence of Two Resonant Structures in e+e- →π+π-hc

M. Ablikim; M. N. Achasov; S. Ahmed; X. C. Ai; O. Albayrak; M. Albrecht; D. J. Ambrose; A. Amoroso; F. F. An; Q. An; J. Z. Bai; O. Bakina; R. Baldini Ferroli; Y. Ban; D. W. Bennett; J. V. Bennett; N. Berger; M. Bertani; D. Bettoni; J. M. Bian; F. Bianchi; E. Boger; I. Boyko; R. A. Briere; H. Cai; X. Cai; O. Cakir; A. Calcaterra; G. F. Cao; S. A. Cetin; J. Chai; J. F. Chang; G. Chelkov; G. Chen; H. S. Chen; J. C. Chen; M. L. Chen; S. Chen; S. J. Chen; X. Chen; X. R. Chen; Y. B. Chen; X. K. Chu; G. Cibinetto; H. L. Dai; J. P. Dai; A. Dbeyssi; D. Dedovich; H. Muramatsu; R. Poling; (BESIII Collaboration)

doi:10.1103/PhysRevLett.118.092002

Evidence of Two Resonant Structures in e+e- →π+π-hc

M. Ablikim, M. N. Achasov, S. Ahmed, X. C. Ai, O. Albayrak, M. Albrecht, D. J. Ambrose, A. Amoroso, F. F. An, Q. An, J. Z. Bai, O. Bakina, R. Baldini Ferroli, Y. Ban, D. W. Bennett, J. V. Bennett, N. Berger, M. Bertani, D. Bettoni, J. M. BianF. Bianchi, E. Boger, I. Boyko, R. A. Briere, H. Cai, X. Cai, O. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. Chai, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. Chen, S. J. Chen, X. Chen, X. R. Chen, Y. B. Chen, X. K. Chu, G. Cibinetto, H. L. Dai, J. P. Dai, A. Dbeyssi, D. Dedovich, H. Muramatsu, R. Poling, (BESIII Collaboration)

Physics and Astronomy (Twin Cities)

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

148 Scopus citations

Abstract

The cross sections of e+e-→π+π-hc at center-of-mass energies from 3.896 to 4.600 GeV are measured using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The cross sections are found to be of the same order of magnitude as those of e+e-→π+π-J/ψ and e+e-→π+π-ψ(2S), but the line shape is inconsistent with the Y states observed in the latter two modes. Two structures are observed in the e+e-→π+π-hc cross sections around 4.22 and 4.39 GeV/c2, which we call Y(4220) and Y(4390), respectively. A fit with a coherent sum of two Breit-Wigner functions results in a mass of (4218.4-4.5+5.5±0.9) MeV/c2 and a width of (66.0-8.3+12.3±0.4) MeV for the Y(4220), and a mass of (4391.5-6.8+6.3±1.0) MeV/c2 and a width of (139.5-20.6+16.2±0.6) MeV for the Y(4390), where the first uncertainties are statistical and the second ones systematic. The statistical significance of Y(4220) and Y(4390) is 10σ over one structure assumption.

Original language	English (US)
Article number	092002
Journal	Physical review letters
Volume	118
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.118.092002
State	Published - Mar 1 2017

Access

10.1103/PhysRevLett.118.092002

OpenUrl availability

Full text

Cite this

Ablikim, M., Achasov, M. N., Ahmed, S., Ai, X. C., Albayrak, O., Albrecht, M., Ambrose, D. J., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bakina, O., Baldini Ferroli, R., Ban, Y., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., ... (BESIII Collaboration) (2017). Evidence of Two Resonant Structures in e+e- →π+π-hc. Physical review letters, 118(9), Article 092002. https://doi.org/10.1103/PhysRevLett.118.092002

Ablikim, M, Achasov, MN, Ahmed, S, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Bakina, O, Baldini Ferroli, R, Ban, Y, Bennett, DW, Bennett, JV, Berger, N, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chai, J, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, S, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Muramatsu, H, Poling, R & (BESIII Collaboration) 2017, 'Evidence of Two Resonant Structures in e+e- →π+π-hc', Physical review letters, vol. 118, no. 9, 092002. https://doi.org/10.1103/PhysRevLett.118.092002

@article{abaaa69859c648eaa9fa6d2b2b5bd2a9,

title = "Evidence of Two Resonant Structures in e+e- →π+π-hc",

abstract = "The cross sections of e+e-→π+π-hc at center-of-mass energies from 3.896 to 4.600 GeV are measured using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The cross sections are found to be of the same order of magnitude as those of e+e-→π+π-J/ψ and e+e-→π+π-ψ(2S), but the line shape is inconsistent with the Y states observed in the latter two modes. Two structures are observed in the e+e-→π+π-hc cross sections around 4.22 and 4.39 GeV/c2, which we call Y(4220) and Y(4390), respectively. A fit with a coherent sum of two Breit-Wigner functions results in a mass of (4218.4-4.5+5.5±0.9) MeV/c2 and a width of (66.0-8.3+12.3±0.4) MeV for the Y(4220), and a mass of (4391.5-6.8+6.3±1.0) MeV/c2 and a width of (139.5-20.6+16.2±0.6) MeV for the Y(4390), where the first uncertainties are statistical and the second ones systematic. The statistical significance of Y(4220) and Y(4390) is 10σ over one structure assumption.",

author = "M. Ablikim and Achasov, {M. N.} and S. Ahmed and Ai, {X. C.} and O. Albayrak and M. Albrecht and Ambrose, {D. J.} and A. Amoroso and An, {F. F.} and Q. An and Bai, {J. Z.} and O. Bakina and {Baldini Ferroli}, R. and Y. Ban and Bennett, {D. W.} and Bennett, {J. V.} and N. Berger and M. Bertani and D. Bettoni and Bian, {J. M.} and F. Bianchi and E. Boger and I. Boyko and Briere, {R. A.} and H. Cai and X. Cai and O. Cakir and A. Calcaterra and Cao, {G. F.} and Cetin, {S. A.} and J. Chai and Chang, {J. F.} and G. Chelkov and G. Chen and Chen, {H. S.} and Chen, {J. C.} and Chen, {M. L.} and S. Chen and Chen, {S. J.} and X. Chen and Chen, {X. R.} and Chen, {Y. B.} and Chu, {X. K.} and G. Cibinetto and Dai, {H. L.} and Dai, {J. P.} and A. Dbeyssi and D. Dedovich and H. Muramatsu and R. Poling and {(BESIII Collaboration)}",

year = "2017",

month = mar,

day = "1",

doi = "10.1103/PhysRevLett.118.092002",

language = "English (US)",

volume = "118",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "9",

}

TY - JOUR

T1 - Evidence of Two Resonant Structures in e+e- →π+π-hc

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Ahmed, S.

AU - Ai, X. C.

AU - Albayrak, O.

AU - Albrecht, M.

AU - Ambrose, D. J.

AU - Amoroso, A.

AU - An, F. F.

AU - An, Q.

AU - Bai, J. Z.

AU - Bakina, O.

AU - Baldini Ferroli, R.

AU - Ban, Y.

AU - Bennett, D. W.

AU - Bennett, J. V.

AU - Berger, N.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bian, J. M.

AU - Bianchi, F.

AU - Boger, E.

AU - Boyko, I.

AU - Briere, R. A.

AU - Cai, H.

AU - Cai, X.

AU - Cakir, O.

AU - Calcaterra, A.

AU - Cao, G. F.

AU - Cetin, S. A.

AU - Chai, J.

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.

AU - Chen, S. J.

AU - Chen, X.

AU - Chen, X. R.

AU - Chen, Y. B.

AU - Chu, X. K.

AU - Cibinetto, G.

AU - Dai, H. L.

AU - Dai, J. P.

AU - Dbeyssi, A.

AU - Dedovich, D.

AU - Muramatsu, H.

AU - Poling, R.

AU - (BESIII Collaboration)

PY - 2017/3/1

Y1 - 2017/3/1

N2 - The cross sections of e+e-→π+π-hc at center-of-mass energies from 3.896 to 4.600 GeV are measured using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The cross sections are found to be of the same order of magnitude as those of e+e-→π+π-J/ψ and e+e-→π+π-ψ(2S), but the line shape is inconsistent with the Y states observed in the latter two modes. Two structures are observed in the e+e-→π+π-hc cross sections around 4.22 and 4.39 GeV/c2, which we call Y(4220) and Y(4390), respectively. A fit with a coherent sum of two Breit-Wigner functions results in a mass of (4218.4-4.5+5.5±0.9) MeV/c2 and a width of (66.0-8.3+12.3±0.4) MeV for the Y(4220), and a mass of (4391.5-6.8+6.3±1.0) MeV/c2 and a width of (139.5-20.6+16.2±0.6) MeV for the Y(4390), where the first uncertainties are statistical and the second ones systematic. The statistical significance of Y(4220) and Y(4390) is 10σ over one structure assumption.

AB - The cross sections of e+e-→π+π-hc at center-of-mass energies from 3.896 to 4.600 GeV are measured using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The cross sections are found to be of the same order of magnitude as those of e+e-→π+π-J/ψ and e+e-→π+π-ψ(2S), but the line shape is inconsistent with the Y states observed in the latter two modes. Two structures are observed in the e+e-→π+π-hc cross sections around 4.22 and 4.39 GeV/c2, which we call Y(4220) and Y(4390), respectively. A fit with a coherent sum of two Breit-Wigner functions results in a mass of (4218.4-4.5+5.5±0.9) MeV/c2 and a width of (66.0-8.3+12.3±0.4) MeV for the Y(4220), and a mass of (4391.5-6.8+6.3±1.0) MeV/c2 and a width of (139.5-20.6+16.2±0.6) MeV for the Y(4390), where the first uncertainties are statistical and the second ones systematic. The statistical significance of Y(4220) and Y(4390) is 10σ over one structure assumption.

UR - http://www.scopus.com/inward/record.url?scp=85014579664&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85014579664&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.118.092002

DO - 10.1103/PhysRevLett.118.092002

M3 - Article

C2 - 28306302

SN - 0031-9007

VL - 118

JO - Physical review letters

JF - Physical review letters

IS - 9

M1 - 092002

ER -

Evidence of Two Resonant Structures in e+e- →π+π-hc

Abstract

Access

OpenUrl availability

Other files and links

Fingerprint

Cite this