Measurements of the Cross Section for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi /><mml:mo>→</mml:mo><mml:mi /><mml:mi>Hadrons</mml:mi></mml:math>at Center-of-Mass Energies from 2 to 5 GeV

Bai, J. Z.; Ban, Y.; Bian, J. G.; Chen, Aoqing; Chen, H. F.; Chen, H. S.; Chen, J. C.; Chen, X. D.; Chen, Y. B.; Cheng, B.; P., S.; Chu, Y. P.; Choi, J.; Cui, X. Z.; Dai, Y. S.; Liu, Dong; Du, Z. Z.; Dunwoodie, W.; Fu, Hai-Bing; Fu, L. P.; Gao, C. S.; Gu, S.; Guo, Y. N.; Guo, Z. J.; Han, S. W.; Han, Y. L.; Harris, F. A.; He, J.; He, K. L.; He, M.; He, X. Q.; Hong, T. M.; Heng, Y. K.; Hu, G. Y.; Hu, H.; Hu, Qin; Hu, T.; Huang, G. S.; Huang, X. P.; Huang, Yizhong; Izen, J. M.; Ji, Xiangdong; Jiang, C. H.; Jin, Y.; Jones, B. D.; Kang, J. S.; Ke, Z. J.; Kim, H. J.; Kim, S. K.; Kim, T. Y.; Kong, D.; Lai, Y. F.; Li, D.; Li, H. B.; Li, H. H.; Li, J.; Li, J. C.; Li, P. Q.; Li, Q. J.; Li, R. Y.; Li, W.; Li, W. G.; Li, X. N.; Li, X. Q.; Liu, B.; Liu, F.; Liu, Feng; Liu, H. M.; Liu, J.; Liu, J. P.; Liu, T. R.; Liu, R. G.; Liu, Y.; Liu, Z. X.; Lou, X. C.; Lu, G. R.; Lu, F. X.; Lu, J. G.; Lu, Z. J.; Luo, X. L.; C., E.; M., J.; Malchow, R.; Mao, H. S.; Mao, Z. P.; Meng, X. C.; Mo, X. H.; Nie, J.; Nie, Z. D.; Olsen, S. L.; Paluselli, D.; Park, H.; Qi, N. D.; Qi, X. R.; Qian, C. D.; Qiu, J. F.; Que, Y. K.; Rong, G.; Shao, Y.; Shen, B. W.; Shen, D. L.; Shen, H. F.; Shen, X. Y.; Sheng, H. Y.; Shi, Feng; Shi, H. Z.; Song, X.; Suh, Jung-Min; Sun, H.; Sun, Liang; Sun, Y. Z.; Tang, S. Q.; Toki, W. H.; Tong, G. L.; Varner, G.; Wang, J.; Wang, J. Z.; Wang, L.; Wang, L. S.; Wang, P.; Wang, P. L.; Wang, S. M.; Wang, Y. Y.; Wang, Z. Y.; Wei, C.; Wu, N.; Xi, D. M.; Xia, X. M.; Xie, X. X.; Xu, G. F.; Yin, Xuefeng; Xue, S.; Yan, W. B.; Yan, W. G.; Yang, C.; Yang, C. Y.; Yang, G.; Yang, H. X.; Yang, W. C.; Yang, Xiaofei; Ye, M. H.; Ye, Shudan; Ye, Y. X.; Chen, Yu; Yu, C. X.; Yu, G.; Yuan, Y.; Zhang, B. Y.; Zhang, C.; Zhang, C. C.; Zhang, D. H.; Zhang, H. L.; Zhang, H. Y.; Zhang, J.; Zhang, J. W.; Zhang, L.; Zhang, L. S.; Zhang, P.; Zhang, Q. J.; Zhang, S. Q.; Zhang, X. Y.; Zhang, Y. Y.; Zhang, Ziping; Zhao, Dongxu; Zhao, H. W.; Zhao, Jiawei; Zhao, M. G.; Zhao, P. P.; Zhao, W. R.; Zhao, Y. B.; Zhao, Z.; Zheng, J. P.; Zheng, Lei; Zheng, Z. P.; Zhou, B.; Zhou, G. M.; Li, Zhou; Zhu, K. J.; Zhu, Q. M.; Zhu, Y.; Zhu, Y. S.; Zhu, Z. A.; Zhuang, B. A.; Zou, B. S.

doi:10.1103/physrevlett.88.101802

Cited by 224 publications

(45 citation statements)

References 17 publications

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“…The leptonic decay widths of c ð4160Þ obtained here with the mixing configuration of ð3 3 S 1 ; 3 3 D 1 Þ and ð4 3 S 1 ; 2 3 D 1 Þ are in agreement with the experimental value 0:48 AE 0:22 and lie within the error bar reported by the Belle and BES collaborations [39,52] but are completely in disagreement with the value of 0:83 AE 0:07 reported by [4]. Though Yð4260Þ can be obtained by 4S À 2D admixture state with mixing angle ¼ 14:44 that predicts its leptonic decay width 0.588 keV, the mixing may not be possible as the 4S and 2D masses differ by more than 200 MeV.…”

supporting

confidence: 89%

Leptonic and digamma decay properties ofS-wave quarkonia states

2012

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Based on Martin-like potential, the masses of quarkonia states and their leptonic decay widths have been reviewed. The hyperfine, spin orbit and tensor interactions are employed to compute the spin splitting of the nS states and the fine splittings of the P and D states. The analysis based on the predicted masses and leptonic decay widths clearly indicates that c ð3686Þ is a mixed state with a 50%-50% admixture of c " c ð2SÞ and the hybrid c " cg in accordance with the suggestion that resolves the À puzzle related to c ð2SÞ. And Çð10355Þ as similar admixture of b " b ð3SÞ with b " bg in accordance with the resolution of Vogel puzzle related to Çð3SÞ state. Analyses on the level differences of S-wave excited states of quantum mechanical bound systems show a systematic behavior as n increases. In view of such systematic behavior expected for quarkonia, we observe that Yð4260Þ and Zð4430Þ 1 ÀÀ states are closer to the 4S and 5S states with leptonic decay widths predicted as 0.65 keV and 0.49 keV, respectively. The c " c ð6SÞ 1 ÀÀ state is predicted to be around 4600 MeV and its leptonic decay width 0.39 keV. The present study also favors other charmonialike states, Yð4360Þ and Yð4660Þ, as admixtures of charmonia S À D states. Similarly we find Çð10865Þ does not fit either the 5S state or an admixture of S À D states of a b " b system. We identify Y b ð10888Þ observed by Belle as the 6S state of bottonia whose leptonic width is predicted as 0.158 keV. Our predicted leptonic width, 0.242 keV of Çð10575; 4SÞ, is in good agreement with the experimental value of 0:272 AE 0:029 keV. We predict the pure Çð5SÞ state at about 100 MeV lower than 10865 MeV and its leptonic width 0.191 keV. The upsilon state Çð11019Þ seems to be the right candidate for the 7S state, with 0.134 keV as its predicted leptonic width, which is in very good agreement with the experimental value of 0:13 AE 0:03 keV.

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supporting

confidence: 89%

Leptonic and digamma decay properties ofS-wave quarkonia states

2012

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“…[47], which are collected in Table 5. 4 There are three main contributions to the moments: narrow resonances (which appear below threshold); threshold (with data collected by different experimental collaborations [52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] up to energies of 10.538 GeV); and continuum, from 10.538 GeV to infinity, with no experimental data available. In Ref.…”

Section: Charm Vector Correlatormentioning

confidence: 99%

Precise determination of αs from relativistic quarkonium sum rules

Boito

Mateu

2020

J. High Energ. Phys.

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We determine the strong coupling α s (m Z ) from dimensionless ratios of roots of moments of the charm-and bottom-quark vector and charm pseudo-scalar correlators, dubbed R X,n q ≡ (M X,n q ) 1 n /(M X,n+1 q ) 1 n+1 , with X = V, P , as well as from the 0-th moment of the charm pseudo-scalar correlator, M P,0 c . In the quantities we use, the mass dependence is very weak, entering only logarithmically, starting at O(α 2 s ). We carefully study all sources of uncertainties, paying special attention to truncation errors, and making sure that orderby-order convergence is maintained by our choice of renormalization scale variation. In the computation of the experimental uncertainty for the moment ratios, the correlations among individual moments are properly taken into account. Additionally, in the perturbative contributions to experimental vector-current moments, α s (m Z ) is kept as a free parameter such that our extraction of the strong coupling is unbiased and based only on experimental data. The most precise extraction of α s from vector correlators comes from the ratio of the charm-quark moments R V,2 c and reads α s (m Z ) = 0.1168 ± 0.0019, as we have recently discussed in a companion letter. From bottom moments, using the ratio R V,2 b , we find α s (m Z ) = 0.1186 ± 0.0048. Our results from the lattice pseudo-scalar charm correlator agree with the central values of previous determinations, but have larger uncertainties due to our more conservative study of the perturbative error. Averaging the results obtained from various lattice inputs for the n = 0 moment we find α s (m Z ) = 0.1177 ± 0.0020. Combining experimental and lattice information on charm correlators into a single fit we obtain α s (m Z ) = 0.1170 ± 0.0014, which is the main result of this article.

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“…The Yð4260Þ and Yð4360Þ did not show up in inclusive hadronic cross section (R) measurements (Bai et al, 2002), as would be expected of such states [there is no fine-grained R-scan data near Yð4660Þ].…”

Section: B New Charmoniumlike Statesmentioning

confidence: 97%

“…Even such basic parameters of the c mesons as mass, width, and leptonic width were known with large uncertainties mainly determined by low statistics of the old experiments. Seth (2005) made an attempt to use the updated information on the R values from Crystal Ball (Osterheld et al, 1986) and BES (Bai et al, 2002) to improve these parameters. Finally, the BES Collaboration performed a global fit of the data on R collected by BES in the energy range from 3.7 to 5 GeV (Ablikim et al, 2008).…”

Section: Isr Studies In the Charmonium Regionmentioning

confidence: 99%

Hadron production viae+e−collisions with initial state radiation

et al. 2011

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A novel method of studying e þ e À annihilation into hadrons using initial state radiation at e þ e À colliders is described. After a brief history of the method, its theoretical foundations are considered. Numerous experiments in which exclusive cross sections of e þ e À annihilation into hadrons below the center-of-mass energy of 5 GeV have been measured are presented. Some applications of the experimental results to fundamental tests of the standard model are listed.

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Measurements of the Cross Section fore+e−→Hadronsat Center-of-Mass Energies from 2 to 5 GeV

Abstract: We report values of R = sigma(e(+)e(-)-->hadrons)/sigma(e(+)e(-)-->mu(+)mu(-)) for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider.

Cited by 224 publications

References 17 publications

Leptonic and digamma decay properties ofS-wave quarkonia states

Leptonic and digamma decay properties ofS-wave quarkonia states

Precise determination of αs from relativistic quarkonium sum rules

Hadron production viae+e−collisions with initial state radiation

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