Observation of h1 (1380) in the J/ψ →η′K K ̄ π decay OBSERVATION of h1 (1380) in Jψ ... M. ABLIKIM et al.

BESIII Collaboration

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Abstract

Using 1.31×109 J/ψ events collected by the BESIII detector at the BEPCII e+e- collider, we report the first observation of the h1(1380) in J/ψ→η′h1(1380) with a significance of more than ten standard deviations. The mass and width of the possible axial-vector strangeonium candidate h1(1380) are measured to be M=(1423.2±2.1±7.3) MeV/c2 and Γ=(90.3±9.8±17.5) MeV. The product branching fractions, assuming no interference, are determined to be B(J/ψ→η′h1(1380))×B(h1(1380)→K∗(892)+K-+c.c.)=(1.51±0.09±0.21)×10-4 in η′K+K-π0 mode and B(J/ψ→η′h1(1380))×B(h1(1380)→K∗(892)K̄+c.c.)=(2.16±0.12±0.29)×10-4 in η′KS0K±π mode. The first uncertainties are statistical and the second are systematic. Isospin symmetry violation is observed in the decays h1(1380)→K∗(892)+K-+c.c. and h1(1380)→K∗(892)0K̄0+c.c.. Based on the measured h1(1380) mass, the mixing angle between the states h1(1170) and h1(1380) is determined to be (35.9±2.6)°, consistent with theoretical expectations.

Original languageEnglish (US)
Article number072005
JournalPhysical Review D
Volume98
Issue number7
DOIs
StatePublished - Oct 1 2018

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Observation of h1 (1380) in the J/ψ →η′K K ̄ π decay OBSERVATION of h1 (1380) in Jψ ... M. ABLIKIM et al. / BESIII Collaboration.

In: Physical Review D, Vol. 98, No. 7, 072005, 01.10.2018.

Research output: Contribution to journalArticle

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title = "Observation of h1 (1380) in the J/ψ →η′K K ̄ π decay OBSERVATION of h1 (1380) in Jψ ... M. ABLIKIM et al.",
abstract = "Using 1.31×109 J/ψ events collected by the BESIII detector at the BEPCII e+e- collider, we report the first observation of the h1(1380) in J/ψ→η′h1(1380) with a significance of more than ten standard deviations. The mass and width of the possible axial-vector strangeonium candidate h1(1380) are measured to be M=(1423.2±2.1±7.3) MeV/c2 and Γ=(90.3±9.8±17.5) MeV. The product branching fractions, assuming no interference, are determined to be B(J/ψ→η′h1(1380))×B(h1(1380)→K∗(892)+K-+c.c.)=(1.51±0.09±0.21)×10-4 in η′K+K-π0 mode and B(J/ψ→η′h1(1380))×B(h1(1380)→K∗(892)K̄+c.c.)=(2.16±0.12±0.29)×10-4 in η′KS0K±π mode. The first uncertainties are statistical and the second are systematic. Isospin symmetry violation is observed in the decays h1(1380)→K∗(892)+K-+c.c. and h1(1380)→K∗(892)0K̄0+c.c.. Based on the measured h1(1380) mass, the mixing angle between the states h1(1170) and h1(1380) is determined to be (35.9±2.6)°, consistent with theoretical expectations.",
author = "{BESIII Collaboration} and M. Ablikim and Achasov, {M. N.} and S. Ahmed and M. Albrecht and A. Amoroso and An, {F. F.} and Q. An and Bai, {J. Z.} and Y. Bai 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 Chen, {P. L.} and Chen, {S. J.} 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 Deng, {Z. Y.} and A. Denig and I. Denysenko and Hajime Muramatsu and Ron Poling",
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AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Ahmed, S.

AU - Albrecht, M.

AU - Amoroso, A.

AU - An, F. F.

AU - An, Q.

AU - Bai, J. Z.

AU - Bai, Y.

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, P. L.

AU - Chen, S. J.

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 - Deng, Z. Y.

AU - Denig, A.

AU - Denysenko, I.

AU - Muramatsu, Hajime

AU - Poling, Ron

PY - 2018/10/1

Y1 - 2018/10/1

N2 - Using 1.31×109 J/ψ events collected by the BESIII detector at the BEPCII e+e- collider, we report the first observation of the h1(1380) in J/ψ→η′h1(1380) with a significance of more than ten standard deviations. The mass and width of the possible axial-vector strangeonium candidate h1(1380) are measured to be M=(1423.2±2.1±7.3) MeV/c2 and Γ=(90.3±9.8±17.5) MeV. The product branching fractions, assuming no interference, are determined to be B(J/ψ→η′h1(1380))×B(h1(1380)→K∗(892)+K-+c.c.)=(1.51±0.09±0.21)×10-4 in η′K+K-π0 mode and B(J/ψ→η′h1(1380))×B(h1(1380)→K∗(892)K̄+c.c.)=(2.16±0.12±0.29)×10-4 in η′KS0K±π mode. The first uncertainties are statistical and the second are systematic. Isospin symmetry violation is observed in the decays h1(1380)→K∗(892)+K-+c.c. and h1(1380)→K∗(892)0K̄0+c.c.. Based on the measured h1(1380) mass, the mixing angle between the states h1(1170) and h1(1380) is determined to be (35.9±2.6)°, consistent with theoretical expectations.

AB - Using 1.31×109 J/ψ events collected by the BESIII detector at the BEPCII e+e- collider, we report the first observation of the h1(1380) in J/ψ→η′h1(1380) with a significance of more than ten standard deviations. The mass and width of the possible axial-vector strangeonium candidate h1(1380) are measured to be M=(1423.2±2.1±7.3) MeV/c2 and Γ=(90.3±9.8±17.5) MeV. The product branching fractions, assuming no interference, are determined to be B(J/ψ→η′h1(1380))×B(h1(1380)→K∗(892)+K-+c.c.)=(1.51±0.09±0.21)×10-4 in η′K+K-π0 mode and B(J/ψ→η′h1(1380))×B(h1(1380)→K∗(892)K̄+c.c.)=(2.16±0.12±0.29)×10-4 in η′KS0K±π mode. The first uncertainties are statistical and the second are systematic. Isospin symmetry violation is observed in the decays h1(1380)→K∗(892)+K-+c.c. and h1(1380)→K∗(892)0K̄0+c.c.. Based on the measured h1(1380) mass, the mixing angle between the states h1(1170) and h1(1380) is determined to be (35.9±2.6)°, consistent with theoretical expectations.

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