Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>η</mml:mi><mml:mi>c</mml:mi><mml:mo>′</mml:mo></mml:msubsup></mml:math>decays into vector meson pairs

Ablikim, M.; Ачасов, М. Н.; Alberto, Diego; An, F. F.; An, Q.; An, Zhongfu; Bai, J. Z.; Baldini, R.; Ban, Y.; Becker, J.; Berger, N.; Bertani, M.; Bian, J. M.; Boger, E.; Bondarenko, O.; Boyko, I.; Briere, R. A.; Bytev, V.; Cai, Xinxia; Calcaterra, A.; Cao, G. F.; Chang, J. F.; Chelkov, G. A.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, S. J.; Chen, Y.; Chen, Y. B.; Cheng, H. P.; Chu, Y. P.; Cronin-Hennessy, D.; Dai, H. L.; Dai, J. P.; Dedovich, D. V.; Deng, Z. Y.; Denysenko, I.; Destefanis, M.; Ding, Y.; Dong, L. Y.; Dong, M. Y.; Du, S. X.; Fang, J.; Su, Fang; Feng, C. Q.; Fu, C. D.; Fu, J.; Gao, Y.; Geng, C.; Goetzen, K.; Gong, W. X.; Greco, M.; Gu, M. H.; Gu, Y. T.; Guan, Y. H.; Guo, A. Q.; Guo, L. B.; Guo, Y. P.; Han, Y. L.; Hao, X. Q.; Harris, F. A.; He, K. L.; He, M.; He, Z. Y.; Heng, Y. K.; Hou, Z. L.; Hu, H. M.; Hu, J. F.; Hu, T.; Huang, Bin; Huang, G. M.; Huang, J. S.; Huang, X. T.; Huang, Y.; Hussain, T.; Ji, C. S.; Ji, Q.; Ji, X. B.; Ji, X. L.; Jia, L. K.; Jiang, L. L.; Jiang, X. S.; Jiao, J. B.; Jiao, Z.; Jin, D. P.; Jin, S.; Jing, F.; Kalantar‐Nayestanaki, N.; Kavatsyuk, M.; Kuehn, W.; Lai, W.; Lange, J. S.; Leung, J. K. C.; Li, C. H.; Li, Cheng; Li, Cui; Li, D. M.; Li, F.; Li, G.; Li, H. B.; Li, J. C.; Li, K.; Li, Lei; Li, N. B.; Li, Q. J.; Li, S. L.; Li, W. D.; Li, W. G.; Li, X. L.; Li, X. N.; Li, X. Q.; Li, X. R.; Li, Z. B.; Liang, H.; Liang, Y. F.; Liang, Y. T.; Liao, X. T.; Liu, B. J.; Liu, C. L.; Liu, C. X.; Liu, C. Y.; Liu, F. H.; Liu, Fang; Liu, Feng; Liu, H.; Liu, H. B.; Liu, H. H.; Liu, H. M.; Liu, H. W.; Liu, J. P.; Liu, K.; Liu, K. Y.; Liu, Q.; Liu, S. B.; Liu, X.; Liu, X. H.; Liu, Y. B.; Liu, Y. W.; Liu, Yong; Liu, Z. A.; Liu, Zhiqiang; Liu, Zhiqing; Loehner, H.; Lu, G. R.; Lü, H. J.; Lu, J. G.; Lü, Q. W.; Lü, X. R.; Lu, Y. P.; Luo, C. L.; Luo, M. X.; Luo, T.; Luo, X. L.; Lv, M.; L., C.; C., F.; L., H.; M., Q.; Ma, Songde; Ma, Tengfei; Ma, Xiaoyan; Y., X.; Maggiora, M.; Malik, Q. A.; Mao, H. S.; Mao, Y.; Mao, Z. P.; Messchendorp, J. G.; Jiang, Min; Min, T. J.; Mitchell, R. E.; Mo, X. H.; Muchnoi, N. Yu.; Nefedov, Y.; Nikolaev, I. B.; Ning, Z.; Olsen, S. L.; Ouyang, Q.; Pacetti, S.; Park, J. W.; Pelizaeus, M.; Peters, K.; Ping, J. L.; Ping, R. G.; Poling, R.; Pun, C. S. J.; Qi, M.; Qian, S. J.; Qiao, C. F.; Qin, X. S.; Qiu, J. F.; Rashid, K. H.; Rong, G.; Ruan, X. D.; Sarantsev, A.; Schulze, J.; Shao, M.; Shen, C. P.; Shen, X. Y.; Sheng, H. Y.; Shepherd, M. R.; Song, X. Y.; Spataro, S.; Spruck, B.; Sun, D. H.; Sun, G. X.; Sun, J. F.; Sun, S. S.; Sun, X.; Sun, Y. J.; Sun, Y. Z.; Sun, Z. J.; Sun, Z. T.; Tang, C. J.; Tang, X.; Tian, H. L.; Toth, D.; Varner, G.; Wang, B.; Wang, B. Q.; Wang, K.; Wang, L. L.; Wang, L. S.; Wang, M.; Wang, P.; Wang, P. L.; Wang, Q.; Wang, Q. J.; Wang, S. G.; Wang, X. L.; Wang, Y. D.; Wang, Y. F.; Wang, Y. Q.; Wang, Z.; Wang, Z. G.; Wang, Z. Y.; Wei, D. H.; Wen, Q. G.; Wen, S. P.; Wiedner, U.; Wu, L. H.; Wu, N.; Wu, W.; Wang, Zhi; Xiao, Z. J.; Xie, Y.; Xiu, Q. L.; Xu, G. F.; Xu, G.; Xu, H. Y.; Xu, Q. J.; Xu, X. P.; Xu, Y.; Xu, Z.; Xu, Z. Z.; Xue, Z.; Yan, L.; Yan, W. B.; Yan, Y. H.; Yang, H. X.; Yang, Tao; Yang, Y.; Yang, Yifan; Ye, H.; Ye, M.; Ye, M. H.; Yu, B. X.; Yu, C. X.; Yu, Shiqi; Yuan, C. Z.; Yuan, W. L.; Yuan, Y.; Zafar, A. A.; Zallo, A.; Zeng, Y.; Zhang, B. X.; Zhang, B. Y.; Zhang, C.; Zhang, C. C.; Zhang, D. H.; Zhang, H. H.; Zhang, H. Y.; Zhang, J.; Zhang, J. Q.; Zhang, J. W.; Zhang, J. Y.; Zhang, J. Z.; Zhang, L.; Zhang, S. H.; Zhang, T. R.; Zhang, X. J.; Zhang, X. Y.; Zhang, Y.; Zhang, Y. H.; Zhang, Y. S.; Zhang, Z. P.; Zhang, Z. Y.; Zhao, G.; Zhao, H. S.; Zhao, J. Z.; Zhao, J. Z.; Liu, Zhao; Zhao, Ling; Zhao, M. G.; Zhao, Q.; Zhao, S. J.; Zhao, T. C.; Zhao, X.; Zhao, Y. B.; Zhao, Z.; Zhao, Z.; Zhemchugov, A.; Zheng, B.; Zheng, J. P.; Zheng, Y. H.; Zheng, Z. P.; Zhong, B.; Zhong, J.; Zhong, L.; Li, Zhou; Zhou, X. K.; Zhou, X. R.; Zhu, C.; Zhu, K.; Zhu, S. H.; Zhu, Xiaoyu; Zhu, X.; Zhu, Y. S.; Zhu, Z. A.; Zhuang, J.; Zou, B. S.; Zou, J. H.; Zuo, J. X.

doi:10.1103/physrevd.84.091102

“…Experimentally, this transition has been searched for by Crystal Ball [13], BES [14], CLEO [15] and most recently by BESIII through c ð2SÞ ! VV [16]. No convincing signal was observed in any of these searches.…”

mentioning

confidence: 94%

“…In the case of a fake photon, the momentum tends to zero, which improves the background separation with minimal distortion of the signal line shape [16].…”

Section: H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 99%

First Observation of theM1Transitionψ(3686)→γηc(2S
Ablikim¹,
Ачасов²,
Ambrose³
et al. 2012
Phys. Rev. Lett.
Self Cite
37
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8
0
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Using a sample of 106 Â 10 6 c ð3686Þ events collected with the BESIII detector at the BEPCII storage ring, we have made the first measurement of the M1 transition between the radially excited charmonium S-wave spin-triplet and the radially excited S-wave spin-singlet states: c ð3686Þ ! c ð2SÞ. Analyses of the processes c ð3686Þ ! c ð2SÞ with c ð2SÞ ! K The quarkonium states play an important role in understanding the strong interaction between quarks. The charmonium states below the open-charm production threshold are relatively well understood, with the notable exception of the spin singlets [1], which include the P-wave state h c and the S-wave ground state c and its first radial excitation c ð2SÞ [2]. These are experimentally challenging because of the low production rates and spin-parity quantum numbers that are inaccessible in direct e þ e À annihilations. The c ð2SÞ was first observed by the Belle collaboration in the processIt was confirmed in the two-photon production of 6,7]. In this Letter, we report the first observation of c ð3686Þ ! c ð2SÞ,,5], and in the double-charmonium production process e þ e À ! J=c c " c [The data sample for this analysis consists of an integrated luminosity of 156 pb À1 (106 Â 10 6 events) produced at the peak of the c ð3686Þ resonance [17] and collected in the BESIII detector [18]. An additional 42 pb À1 of data were collected at a center-of-mass energy of ffiffi ffi s p ¼ 3:65 GeV to determine nonresonant continuum background contributions.The BESIII detector, described in detail in Ref. [18], has an effective geometrical acceptance of 93% of 4. A small-cell, helium-based main drift chamber in a 1-T magnetic field provides a charged-particle momentum resolution of 0.5% at 1 GeV=c, and specific-ionization (dE=dx) measurements for particle identification with a resolution better than 6% for electrons from Bhabha scattering. The cesium iodide electromagnetic calorimeter (EMC) measures photon energies with resolutions at 1.0 GeV of 2.5% and 5% in the detector's barrel (j cosj < 0:8, where is the polar angle with respect to the e þ direction) and end caps (0:86 < j cosj < 0:92), respectively. Additional particle identification is provided by a time-of-flight system with a time resolution of 80 ps (110 ps) for the barrel (end caps).Reconstructed charged tracks other than daughters of K

show abstract

“…This program of BESIII resulted so far in a variety of papers that can be found in Refs. [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]. The bulk of the activities below the open-charm threshold focuses on precision measurements of the properties of charmonium states, such as their masses, total widths, line shapes, and partial decay rates.…”

Section: Highlights In Charmonium Spectroscopy and Decaysmentioning

confidence: 99%

Physics with Charmonium -- A few recent highlights of BESIII

Messchendorp¹

2013

Preprint

1

0

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Despite the successes of the standard model, the non-perturbative dynamics of the strong interaction are not fully understood yet. Charmonium spectroscopy serves as an ideal tool to shed light on the dynamics of the strong interaction such as quark confinement and the generation of hadron masses. The BESIII collaboration studies extensively the strong interaction and various aspects that could shed light on physics beyond the standard model via copious e + e − collisions at the BESIII/BEPCII facility in Beijing, China, in the charmonium mass regime. I present a few of the recent results with the emphasis on charmonium spectroscopy and decay studies using 106×10 6 ψ(3686) events.

show abstract

“…This program of BESIII resulted so far in a variety of papers that can be found in Refs. [3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29]. The bulk of the activities below the open-charm threshold focuses on precision measurements of the properties of charmonium states, such as their masses, total widths, line shapes, and partial decay rates.…”

Section: Highlights In Charmonium Spectroscopy and Decaysmentioning

confidence: 99%

Recent results from BESIII

Messchendorp¹

2013

Proceedings of 51st International Winter Meeting on Nuclear Physics — PoS(Bormio 2013)

0

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Despite the successes of the standard model, the non-perturbative dynamics of the strong interaction are not fully understood yet. Charmonium spectroscopy serves as an ideal tool to shed light on the dynamics of the strong interaction such as quark confinement and the generation of hadron masses. The BESIII collaboration studies extensively the strong interaction and various aspects that could shed light on physics beyond the standard model via copious e + e − collisions at the BESIII/BEPCII facility in Beijing, China, in the charmonium mass regime. I present a few of the recent results with the emphasis on charmonium spectroscopy and decay studies using 106×10 6 ψ(3686) events.International Winter Meeting on Nuclear Physics, 21-25 January 2013 Bormio, Italy * Speaker. PoS(Bormio 2013)043Physics with Charmonium at BESIII Johan Messchendorp Figure 1: The strong coupling constant, α S , as a function of the distance scale. Towards larger distances, QCD becomes non-perturbative, and gives rise to spectacular phenomena such as the generation of hadron masses and quark confinement.

show abstract

Search forηc′decays into vector meson pairs

Cited by 13 publications

References 24 publications

First Observation of theM1Transitionψ(3686)→γηc(2S
Ablikim¹,
Ачасов²,
Ambrose³
et al. 2012
Phys. Rev. Lett.
Self Cite
37
1
8
0
View full text Add to dashboard Cite

First Observation of theM1Transitionψ(3686)→γηc(2S
Ablikim¹,
Ачасов²,
Ambrose³
et al. 2012
Phys. Rev. Lett.
Self Cite
37
1
8
0
View full text Add to dashboard Cite

Physics with Charmonium -- A few recent highlights of BESIII

Recent results from BESIII

Contact Info

Product

Resources

About

Search forηc′decays into vector meson pairs

Cited by 13 publications

References 24 publications

First Observation of theM1Transitionψ(3686)→γηc(2SAblikim1, Ачасов2, Ambrose3 et al. 2012Phys. Rev. Lett.Self Cite37180View full textAdd to dashboardCite

First Observation of theM1Transitionψ(3686)→γηc(2SAblikim1, Ачасов2, Ambrose3 et al. 2012Phys. Rev. Lett.Self Cite37180View full textAdd to dashboardCite

Physics with Charmonium -- A few recent highlights of BESIII

Recent results from BESIII

Contact Info

Product

Resources

About

First Observation of theM1Transitionψ(3686)→γηc(2S
Ablikim¹,
Ачасов²,
Ambrose³
et al. 2012
Phys. Rev. Lett.
Self Cite
37
1
8
0
View full text Add to dashboard Cite

First Observation of theM1Transitionψ(3686)→γηc(2S
Ablikim¹,
Ачасов²,
Ambrose³
et al. 2012
Phys. Rev. Lett.
Self Cite
37
1
8
0
View full text Add to dashboard Cite