First Observation of the Direct Production of the χc1 in e+e- Annihilation

(BESIII Collaboration)

doi:10.1103/PhysRevLett.129.122001

First Observation of the Direct Production of the χc1 in e+e- Annihilation

(BESIII Collaboration)

Physics and Astronomy (Twin Cities)

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

6 Scopus citations

Abstract

We study the direct production of the JPC=1++ charmonium state χc1(1P) in electron-positron annihilation by carrying out an energy scan around the mass of the χc1(1P). The data were collected with the BESIII detector at the BEPCII collider. An interference pattern between the signal process e+e-→χc1(1P)→γJ/ψ→γμ+μ- and the background processes e+e-→γISRJ/ψ→γISRμ+μ- and e+e-→γISRμ+μ- is observed by combining all the data samples. The χc1(1P) signal is observed with a significance of 5.1σ. This is the first observation of a C-even state directly produced in e+e- annihilation. The electronic width of the χc1(1P) resonance is determined to be Γee=(0.12-0.08+0.13) eV, which is of the same order of magnitude as theoretical calculations.

Original language	English (US)
Article number	122001
Journal	Physical review letters
Volume	129
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.129.122001
State	Published - Sep 16 2022

Bibliographical note

Publisher Copyright:
© 2022 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 SCOAP3.

Access

10.1103/PhysRevLett.129.122001

OpenUrl availability

Full text

Cite this

@article{ffffd5478cf34d4db29dbfe45a5b0eb7,

title = "First Observation of the Direct Production of the χc1 in e+e- Annihilation",

abstract = "We study the direct production of the JPC=1++ charmonium state χc1(1P) in electron-positron annihilation by carrying out an energy scan around the mass of the χc1(1P). The data were collected with the BESIII detector at the BEPCII collider. An interference pattern between the signal process e+e-→χc1(1P)→γJ/ψ→γμ+μ- and the background processes e+e-→γISRJ/ψ→γISRμ+μ- and e+e-→γISRμ+μ- is observed by combining all the data samples. The χc1(1P) signal is observed with a significance of 5.1σ. This is the first observation of a C-even state directly produced in e+e- annihilation. The electronic width of the χc1(1P) resonance is determined to be Γee=(0.12-0.08+0.13) eV, which is of the same order of magnitude as theoretical calculations.",

author = "{(BESIII Collaboration)} and M. Ablikim and Achasov, {M. N.} and P. Adlarson and S. Ahmed and M. Albrecht and R. Aliberti and A. Amoroso and An, {M. R.} and Q. An and Bai, {X. H.} and Y. Bai and O. Bakina and Ferroli, {R. Baldini} and I. Balossino and Y. Ban and V. Batozskaya and D. Becker and K. Begzsuren and N. Berger and M. Bertani and D. Bettoni and F. Bianchi and J. Bloms and A. Bortone and I. Boyko and Briere, {R. A.} and A. Brueggemann and H. Cai and X. Cai and A. Calcaterra and Cao, {G. F.} and N. Cao and Cetin, {S. A.} and Chang, {J. F.} and Chang, {W. L.} and G. Chelkov and C. Chen and G. Chen and Chen, {H. S.} and Chen, {M. L.} and Chen, {S. J.} and T. Chen and Chen, {X. R.} and Chen, {X. T.} and Chen, {Y. B.} and Chen, {Z. J.} and Cheng, {W. S.} and G. Cibinetto and F. Cossio and H. Muramatsu",

note = "Publisher Copyright: {\textcopyright} 2022 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 SCOAP3.",

year = "2022",

month = sep,

day = "16",

doi = "10.1103/PhysRevLett.129.122001",

language = "English (US)",

volume = "129",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "12",

}

TY - JOUR

T1 - First Observation of the Direct Production of the χc1 in e+e- Annihilation

AU - (BESIII Collaboration)

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Ahmed, S.

AU - Albrecht, M.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, M. R.

AU - An, Q.

AU - Bai, X. H.

AU - Bai, Y.

AU - Bakina, O.

AU - Ferroli, R. Baldini

AU - Balossino, I.

AU - Ban, Y.

AU - Batozskaya, V.

AU - Becker, D.

AU - Begzsuren, K.

AU - Berger, N.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bianchi, F.

AU - Bloms, J.

AU - Bortone, A.

AU - Boyko, I.

AU - Briere, R. A.

AU - Brueggemann, A.

AU - Cai, H.

AU - Cai, X.

AU - Calcaterra, A.

AU - Cao, G. F.

AU - Cao, N.

AU - Cetin, S. A.

AU - Chang, J. F.

AU - Chang, W. L.

AU - Chelkov, G.

AU - Chen, C.

AU - Chen, G.

AU - Chen, H. S.

AU - Chen, M. L.

AU - Chen, S. J.

AU - Chen, T.

AU - Chen, X. R.

AU - Chen, X. T.

AU - Chen, Y. B.

AU - Chen, Z. J.

AU - Cheng, W. S.

AU - Cibinetto, G.

AU - Cossio, F.

AU - Muramatsu, H.

N1 - Publisher Copyright: © 2022 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 SCOAP3.

PY - 2022/9/16

Y1 - 2022/9/16

N2 - We study the direct production of the JPC=1++ charmonium state χc1(1P) in electron-positron annihilation by carrying out an energy scan around the mass of the χc1(1P). The data were collected with the BESIII detector at the BEPCII collider. An interference pattern between the signal process e+e-→χc1(1P)→γJ/ψ→γμ+μ- and the background processes e+e-→γISRJ/ψ→γISRμ+μ- and e+e-→γISRμ+μ- is observed by combining all the data samples. The χc1(1P) signal is observed with a significance of 5.1σ. This is the first observation of a C-even state directly produced in e+e- annihilation. The electronic width of the χc1(1P) resonance is determined to be Γee=(0.12-0.08+0.13) eV, which is of the same order of magnitude as theoretical calculations.

AB - We study the direct production of the JPC=1++ charmonium state χc1(1P) in electron-positron annihilation by carrying out an energy scan around the mass of the χc1(1P). The data were collected with the BESIII detector at the BEPCII collider. An interference pattern between the signal process e+e-→χc1(1P)→γJ/ψ→γμ+μ- and the background processes e+e-→γISRJ/ψ→γISRμ+μ- and e+e-→γISRμ+μ- is observed by combining all the data samples. The χc1(1P) signal is observed with a significance of 5.1σ. This is the first observation of a C-even state directly produced in e+e- annihilation. The electronic width of the χc1(1P) resonance is determined to be Γee=(0.12-0.08+0.13) eV, which is of the same order of magnitude as theoretical calculations.

UR - http://www.scopus.com/inward/record.url?scp=85138917856&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85138917856&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.129.122001

DO - 10.1103/PhysRevLett.129.122001

M3 - Article

C2 - 36179210

AN - SCOPUS:85138917856

SN - 0031-9007

VL - 129

JO - Physical review letters

JF - Physical review letters

IS - 12

M1 - 122001

ER -

First Observation of the Direct Production of the χc1 in e+e- Annihilation

Abstract

Bibliographical note

Access

OpenUrl availability

Other files and links

Fingerprint

Cite this