Measurements of e + e − → η c π + π − π 0 , η c π + π − , and η c π 0 γ at s from 4.18 to 4.60 GeV, and search for a Z c state close to the D D ¯ threshold decaying to η c π at s = 4.23     GeV

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doi:10.1103/PhysRevD.103.032006

Title: Measurements of $e^{+} e^{-} \to η_{c} π^{+} π^{-} π^{0}$ , $η_{c} π^{+} π^{-}$ , and $η_{c} π^{0} γ$ at $\sqrt{s}$ from 4.18 to 4.60 GeV, and search for a $Z_{c}$ state close to the $D \bar{D}$ threshold decaying to $η_{c} π$ at $\sqrt{s} = 4.23 GeV$

Journal Article · Thu Feb 25 00:00:00 EST 2021 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.103.032006· OSTI ID:1767361

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, Q.; Anita,; Bai, X. H.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Balossino, I.; Ban, Y.; Begzsuren, K.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D. more »

We study η_c production at center-of-mass energies √s from 4.18 to 4.60 GeV in e⁺e^– annihilation data collected with the BESIII detector operating at the BEPCII storage ring, corresponding to 7.3 fb^–1 of integrated luminosity. We measure the cross sections of the three different exclusive reactions e⁺e^– → η_cπ⁺π^–π⁰, e⁺e^– → η_cπ⁺π^–, and e⁺e^– → η_cπ⁰γ. We find significant η_c production in e⁺e^– → η_cπ⁺π^–π⁰ at √s of 4.23 GeV and 4.26 GeV and observe a significant energy-dependent Born cross section that we measure to be consistent with the production via the intermediate Y(4260) resonance. In addition, we perform a search for a charmoniumlike Z_c state close to the $$D\bar{D}$$ threshold that decays to η_cπ, involving ground state charmonium, and observe no signal. Corresponding upper limits on the cross section of η_c and Z_c production are provided, where the yields are not found to be significant.

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Research Organization:: Indiana Univ., Bloomington, IN (United States); Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: BESIII Collaboration

Grant/Contract Number:: FG02-05ER41374; SC-0012069; 2015CB856700; DPT2006K-120470; SC0012069

OSTI ID:: 1767361

Alternate ID(s):: OSTI ID: 1849623

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 103 Journal Issue: 3; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Observation of Two Resonant Structures in $e^{+} e^{-} \to π^{+} π^{-} ψ (2 S)$ via Initial-State Radiation at Belle Wang, X. L.; Yuan, C. Z.; Shen, C. P. Physical Review Letters, Vol. 99, Issue 14 https://doi.org/10.1103/PhysRevLett.99.142002	journal	October 2007
Study of the process $e^{+} e^{-} \to π^{0} π^{0} J / ψ$ and neutral charmoniumlike state $Z_{c} (3900)^{0}$ Ablikim, M.; Achasov, M. N.; Adlarson, P. Physical Review D, Vol. 102, Issue 1 https://doi.org/10.1103/PhysRevD.102.012009	journal	July 2020
Trial factors for the look elsewhere effect in high energy physics Gross, Eilam; Vitells, Ofer The European Physical Journal C, Vol. 70, Issue 1-2 https://doi.org/10.1140/epjc/s10052-010-1470-8	journal	October 2010
Determination of the Spin and Parity of the $Z_{c} (3900)$ Ablikim, M.; Achasov, M. N.; Ai, X. C. Physical Review Letters, Vol. 119, Issue 7 https://doi.org/10.1103/PhysRevLett.119.072001	journal	August 2017
Observation of $Z_{c} (3900)^{0}$ in $e^{+} e^{-} \to π^{0} π^{0} J / ψ$ Ablikim, M.; Achasov, M. N.; Ai, X. C. Physical Review Letters, Vol. 115, Issue 11 https://doi.org/10.1103/PhysRevLett.115.112003	journal	September 2015
Development of dipole magnet power supply for BEPC-II energy upgrading project Guo, X. L.; Chen, B.; Han, C. Radiation Detection Technology and Methods, Vol. 3, Issue 2 https://doi.org/10.1007/s41605-018-0089-4	journal	January 2019
Evidence for an $$\eta _c(1S) \pi ^-$$ η c ( 1 S ) π - resonance in $$B^0 \rightarrow \eta _c(1S) K^+\pi ^-$$ B 0 → η c ( 1 S ) K + π - decays Aaij, R.; Beteta, C. Abellán; Adeva, B. The European Physical Journal C, Vol. 78, Issue 12 https://doi.org/10.1140/epjc/s10052-018-6447-z	journal	December 2018
Geant4—a simulation toolkit Agostinelli, S.; Allison, J.; Amako, K. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3 https://doi.org/10.1016/S0168-9002(03)01368-8	journal	July 2003
Multiquark resonances Esposito, A.; Pilloni, A.; Polosa, A. D. Physics Reports, Vol. 668 https://doi.org/10.1016/j.physrep.2016.11.002	journal	January 2017
Charm Physics Asner, D. M.; Bigi, I. I.; Charles, J. International Journal of Modern Physics A, Vol. 24, Issue supp01 https://doi.org/10.1142/S0217751X09046801	journal	May 2009
The hidden-charm pentaquark and tetraquark states Chen, Hua-Xing; Chen, Wei; Liu, Xiang Physics Reports, Vol. 639 https://doi.org/10.1016/j.physrep.2016.05.004	journal	June 2016
QED bremsstrahlung in semileptonic B and leptonic τ decays Richter-Wa̧s, E. Physics Letters B, Vol. 303, Issue 1-2 https://doi.org/10.1016/0370-2693(93)90062-M	journal	April 1993
Design and construction of the BESIII detector Ablikim, M.; An, Z. H.; Bai, J. Z. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 614, Issue 3 https://doi.org/10.1016/j.nima.2009.12.050	journal	March 2010
Measurements of the center-of-mass energies at BESIII via the di-muon process Ablikim, M.; Achasov, M. N.; Ai, X. C. Chinese Physics C, Vol. 40, Issue 6 https://doi.org/10.1088/1674-1137/40/6/063001	journal	June 2016

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Title: Measurements of e + e − → η c π + π − π 0 , η c π + π − , and η c π 0 γ at s from 4.18 to 4.60 GeV, and search for a Z c state close to the D D ¯ threshold decaying to η c π at s = 4.23 GeV

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Title: Measurements of $e^{+} e^{-} \to η_{c} π^{+} π^{-} π^{0}$ , $η_{c} π^{+} π^{-}$ , and $η_{c} π^{0} γ$ at $\sqrt{s}$ from 4.18 to 4.60 GeV, and search for a $Z_{c}$ state close to the $D \bar{D}$ threshold decaying to $η_{c} π$ at $\sqrt{s} = 4.23 GeV$