A measurement of decay widths

Bai, J. Z.; Chen, G. P.; Chen, H. F.; Chen, S. J.; Chen, S. M.; Chen, Y.; Chen, Y. B.; Chen, Y. Q.; Cheng, B. S.; Cheng, Zhengdong; Cui, H.; Cui, X. Z.; Ding, H. L.; Ding, Wanyu; Du, Z. Z.; Fan, X. L.; Fang, J.; Fang, W.; Gao, C. S.; Gao, M.; Gao, S. Q.; Gao, W. X.; Gu, JH; Gu, S.; Gu, W. X.; Gu, Y. F.; Guo, Y. N.; Guo, Ya-Nan; Han, S. W.; Han, Y. L.; He, J.; He, K.; He, M.; Hu, G. Y.; Hu, H.; Hu, T.; Hu, X. Q.; Huang, D. Q.; Huang, Yizhong; Jiang, C. H.; Jin, S.; Jin, Y.; Kang, S. H.; Ke, Z. J.; Lai, Y. F.; Lan, H.; Lang, P. F.; Li, F.; Li, J.; Li, P. Q.; Li, Q.; Li, Q. M.; Li, R. B.; Li, W.; Li, W. D.; Li, W. G.; Li, X. N.; Lin, S. Z.; Liu, H. M.; Liu, J. H.; Liu, Q.; Liu, R. G.; Liu, Y.; Liu, Z. A.; Lu, J. G.; Luo, S.; M., A.; Ma, D. H.; C., E.; M., J.; Mao, H. S.; Mao, Z. P.; Meng, X. C.; Ni, H.; Nie, J.; Lu, Pan; Qi, N. D.; Que, Y. K.; Rong, G.; Shao, Y.; Shen, B. W.; Shen, D. L.; Shen, Hong; Shen, X. Y.; Sheng, H. Y.; Shi, H. Z.; Song, X.; Sun, F.; Sun, H.; Tan, Y. P.; Tang, S. Q.; Tong, G. L.; Wang, L. S.; Wang, L. Z.; Wang, M.; Wang, P.; Wang, P. L.; Wang, S. M.; Wang, T. J.; Wang, Y. Y.; Wei, C.; Xi, D. M.; Xia, X. M.; Xie, P. P.; Xie, X. X.; Xie, Y.; Xu, D.; Xu, R.; Xu, Z.; Xue, S.; Yan, Jun; Yan, W. G.; Yang, C.; Yang, C. Y.; Yang, W. C.; Ye, M. H.; Ye, S. Z.; Chen, Yu; Yu, C. X.; Z, Yu; Yuan, C. Z.; Zhang, B. Y.; Zhang, C. C.; Zhang, D. H.; Zhang, H. L.; Zhang, J.; Zhang, J. W.; Zhang, L. S.; Zhang, S. Q.; Zhang, X. Y.; Zhang, Y.; Zhang, Y. Y.; Zhuang, B. A.; Zhao, Dongxu; Zhao, Jiawei; Zhao, M. G.; Zhao, P. D.; Zhao, W.; Zhao, W. R.; Zheng, J. P.; Zheng, Lei; Zheng, Z. P.; Zhou, B.; Zhou, G. P.; Zhou, H.; Li, Zhou; Zhou, X.; Zhou, Y.; Zhu, Q. M.; Zhu, Y.; Zhu, Y. S.

doi:10.1016/0370-2693(95)00712-t

Cited by 26 publications

(4 citation statements)

References 19 publications

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“…Our result for the Γ hadrons (J/ψ) value is consistent with and four times more precise than the previous direct measurement of the hadronic width by the BES collaboration in 1995 [3]. Figure 1 shows comparison of the measured Γ(J/ψ) and Γ hadrons (J/ψ) values with those obtained in previous experiments.…”

Section: Jhep07(2020)112supporting

confidence: 89%

Addendum to: Measurement of Γee(J/ψ) with KEDR detector

Anashin

Aulchenko

Baldin

et al. 2020

J. High Energ. Phys.

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Section: Jhep07(2020)112supporting

confidence: 89%

Addendum to: Measurement of Γee(J/ψ) with KEDR detector

Anashin

Aulchenko

Baldin

et al. 2020

J. High Energ. Phys.

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“…The MeV mass range for the QCD axion With such large couplings, radiative decays of quarkonia to γa would dominate over leptonic modes, in gross contradiction with observation. In fact, bounds from quarkonia decays alone [38][39][40][41][42] were sufficient to exclude the entire parameter space of the original PQWW axion (see, for instance, [43]). These and other bounds led to much activity during the 1980's in model building QCD axion variants, i.e., variations of the original PQWW axion that could evade existing constraints at the time and remain viable.…”

Section: A Constraints Amenable To Model-buildingmentioning

confidence: 99%

A viable QCD axion in the MeV mass range

Alves

Weiner

2018

J. High Energ. Phys.

102

120

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The QCD axion is one of the most compelling solutions of the strong CP problem. There are major current efforts into searching for an ultralight, invisible axion, which is believed to be the only phenomenologically viable realization of the QCD axion. Visible axions with decay constants at or below the electroweak scale are believed to have been long excluded by laboratory searches.Considering the significance of the axion solution to the strong CP problem, we revisit experimental constraints on QCD axions in the O(10 MeV) mass window. In particular, we find a variant axion model that remains compatible with existing constraints. This model predicts new states at the GeV scale coupled hadronically, and a variety of low-energy axion signatures, such as rare meson decays, nuclear de-excitations via axion emission, and production in e + e − annihilation and fixed target experiments. This reopens the possibility of solving the strong CP problem at the GeV scale.

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“…An interference pattern was observed in an earlier stage and in leptonic final states by SPEAR [8] and BESII [9]. In both scenarios inclusive set of final states provided no indication of an interference, but, as soon as exclusive final states were considered, the dips in the cross sections could be detected.…”

Section: Relative Phase Measurementmentioning

confidence: 99%

Measuring the phase between strong and EM J/psi decay amplitudes

Stefanis¹

2013

Proceedings of XXI International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXI)

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QCD is certainly a well established theory describing strong interactions. Yet several physics topics which could be investigated with modern facilities can still offer various test of this theory. The investigation of the kinematic region near J/ψ production can provide a check of the QCD perturbative approach. In this energy range, an interference between the resonant e + e − → J/ψ → hadrons and the non-resonant e + e − → hadrons amplitudes can in principle occur. A perturbative approach suggests that those amplitudes are expected to be all almost real, i.e. the relative phase between the above cited amplitudes is expected to be 0 • /180 • , depicting hence the full interference scenario. Nevertheless, data available in the literature concordantly suggest a relative phase of 90 • and, hence, the no interference scenario. An experimental approach able to provide a measurement of the relative phase in a model independent way, and in particular its deployment in the BESIII scenario, will be discussed in details.

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A measurement of decay widths

Cited by 26 publications

References 19 publications

Addendum to: Measurement of Γee(J/ψ) with KEDR detector

Addendum to: Measurement of Γee(J/ψ) with KEDR detector

A viable QCD axion in the MeV mass range

Measuring the phase between strong and EM J/psi decay amplitudes

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