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Zhu, K. J.; Yuan, C. Z.; Ping, Rong-Gang

doi:10.1103/physrevd.78.036004

“…Other possible background sources not included in the sidebands are found to be small from MC simulation [7]; these include (1) π + π − J/ψ with J/ψ decays into final states other than lepton pairs and (2) XJ/ψ, with X not being a π + π − pair, such as K + K − or π + π − π 0 . Non-ISR production of e + e − → π + π − J/ψ final states, such as e + e − → γγ * γ * → γρ 0 J/ψ, is also estimated to be small [15]. Systematic uncertainties of the cross section measurement are found to be 7.9% and 7.3% for the e + e − and µ + µ − modes, respectively.…”

mentioning

confidence: 95%

Study ofe+e−→π+π−J/ψand Observation of a Charged Charmoniumlik

Liu¹,

Shen²,

Yuan³

et al. 2013

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The cross section for ee+ e- → π+ π- J/ψ between 3.8 and 5.5 GeV is measured with a 967 fb(-1) data sample collected by the Belle detector at or near the Υ(nS) (n = 1,2,…,5) resonances. The Y(4260) state is observed, and its resonance parameters are determined. In addition, an excess of π+ π- J/ψ production around 4 GeV is observed. This feature can be described by a Breit-Wigner parametrization with properties that are consistent with the Y(4008) state that was previously reported by Belle. In a study of Y(4260) → π+ π- J/ψ decays, a structure is observed in the M(π(±)J/ψ) mass spectrum with 5.2σ significance, with mass M = (3894.5 ± 6.6 ± 4.5) MeV/c2 and width Γ = (63 ± 24 ± 26) MeV/c2, where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmoniumlike state.

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“…Non-ISR production of the e + e − → K + K − J/ψ process, such as e + e − → γγ * γ * → γφJ/ψ, is calculated to be small [24] and is neglected. For the M(K 0 S K 0 S J/ψ) distribution, there are only 10 signal candidate events between 4.6 and 5.5 GeV/c 2 with 4 background events estimated from the J/ψ mass sidebands.…”

Section: Event Selectionmentioning

confidence: 99%

Updated cross section measurement ofe+e−→K+K

Shen

¹

,

Yuan²,

Wang³

et al. 2014

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The cross sections of the processes e + e − → K + K − J/ψ and K 0 S K 0 S J/ψ are measured via initial state radiation at center-of-mass energies between the threshold and 6.0 GeV using a data sample of 980 fb −1 collected with the Belle detector on or near the Υ(nS) resonances, where n =1, 2, ..., 5. The cross sections for e + e − → K + K − J/ψ are at a few pb level and the average cross section for e + e − → K 0 S K 0 S J/ψ is 1.8 ± 0.6(stat.) ± 0.3(syst.) pb between 4.4 and 5.2 GeV. All of them are consistent with previously published results with improved precision. A search for resonant structures and associated intermediate states in the cross section of the process e + e − → K + K − J/ψ is performed.

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“…The number of these background events is found to be small from MC simulation and thus they are neglected. Non-ISR production of the e + e − → K + K − J/ψ process, such as e + e − → γγ * γ * → γφJ/ψ, is calculated to be small [24] and is neglected. For the M(K 0 S K 0 S J/ψ) distribution, there are only 10 signal candidate events between 4.6 and 5.5 GeV/c 2 with 4 background events estimated from the J/ψ mass sidebands.…”

Section: Event Selectionmentioning

confidence: 99%

Updated Cross Section Measurement of $e^+ e^- \to K^+ K^- J/ψ$ and $K_S^0K_S^0J/ψ$ via Initial State Radiation at Belle

Shen,

Yuan,

Wang

et al. 2014

Preprint

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The cross sections of the processes e + e − → K + K − J/ψ and K 0 S K 0 S J/ψ are measured via initial state radiation at center-of-mass energies between the threshold and 6.0 GeV using a data sample of 980 fb −1 collected with the Belle detector on or near the Υ(nS) resonances, where n =1, 2, ..., 5. The cross sections for e + e − → K + K − J/ψ are at a few pb level and the average cross section for e + e − → K 0 S K 0 S J/ψ is 1.8 ± 0.6(stat.) ± 0.3(syst.) pb between 4.4 and 5.2 GeV. All of them are consistent with previously published results with improved precision. A search for resonant structures and associated intermediate states in the cross section of the process e + e − → K + K − J/ψ is performed.

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Cross sections ofe+e−→γVVande+e−→γ

Cited by 3 publications

References 31 publications

Study ofe+e−→π+π−J/ψand Observation of a Charged Charmoniumlik

Study ofe+e−→π+π−J/ψand Observation of a Charged Charmoniumlik

Updated cross section measurement ofe+e−→K+K

Updated Cross Section Measurement of $e^+ e^- \to K^+ K^- J/ψ$ and $K_S^0K_S^0J/ψ$ via Initial State Radiation at Belle

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