Measurement of the mass and full width of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>η</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>meson

Bai, J. Z.; Ban, Y.; Bian, J. G.; Blum, I.; Chen, A.D.; Chen, G.P.; Chen, H.F.; Chen, H.S.; Chen, J.; Chen, J.C.

doi:10.1103/physrevd.62.072001

Cited by 14 publications

(4 citation statements)

References 12 publications

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“…M (K ± K 0 S ⇡ ⌥ ) GeV/c 2 Events / 10 MeV/c 2 BESIII Figure 6 Evolution of measurements of the ηc(1S) mass. (left) Measurement of the ηc(1S) mass at BESI (56) in the process J/ψ → γηc(1S); ηc(1S) → K ± K 0 S π ∓ using 7.8 million J/ψ decays. (middle) Measurement of the ηc(1S) mass at BESII (57) in the same process using 58 million J/ψ decays.…”

Section: -4mentioning

confidence: 99%

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Physics Accomplishments and Future Prospects of the BES Experiments at the Beijing Electron--Positron Collider

Briere

Harris

Mitchell

2016

Annu. Rev. Nucl. Part. Sci.

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The cornerstone of the Chinese experimental particle physics program consists of a series of experiments performed in the tau-charm energy region. China began building e + e − colliders at the Institute for High Energy Physics in Beijing more than three decades ago. Beijing Electron Spectrometer, BES, is the common root name for the particle physics detectors operated at these machines. The development of the BES program is summarized and highlights of the physics results across several topical areas are presented.

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Section: -4mentioning

confidence: 99%

“…Notice the obvious distortion in the lineshape at BESIII and hints of the same distortion at BESII. Modified from References (56,57,59) with permission. events in which the photon converted in the detector to an e + e − pair were used.…”

Section: -4mentioning

confidence: 99%

Physics Accomplishments and Future Prospects of the BES Experiments at the Beijing Electron--Positron Collider

Briere

Harris

Mitchell

2016

Annu. Rev. Nucl. Part. Sci.

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“…B → η b X (blue points): f) BaBar [53], g) Belle [54]. M1 transitions J/ψ → γη c (1S ) and ψ → γη c (1S ) (black dots): h) i) BES [55], l) BES [56], m) CLEO [47]. E1 transition h c (1P) → γη c (1S ) (green dot): n) [57].…”

Section: New Hadronic Transitionsmentioning

confidence: 99%

Bottomonium physics above BB¯ thresholds with the Belle experiment

Tamponi

2016

AIP Conference Proceedings

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Abstract. The structure of heavy mesons located above the thresholds for the open flavor production has been largely discussed in the recent years. Their conventional description as pure BB bound state has been called into question by the study of the hadronic transitions to the lower states, and the observation of charged exotic states has highlighted the importance of the light quark degrees of freedom in the description of both charmonia and bottomonia. We will report the most recent experimental measurements performed by the Belle collaboration in the Y(4S), Y(5S) and Y(6S) regions, including the measurement of the ratio, the search for neutral states near the B 0B0 threshold, the first observation of the transition Υ(4S ) → ηh b (1P) and the study of the η transitions at the Υ(5S ) energy. The contribution to the study of the structure of these states coming from the measurement of hadronic transitions will be discussed.

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“…The role of the feed-down from heavier S states (responsible, for example, for about 8% of J/ψ production at low p T [7]) is rather well understood. Data of the BES [8] and CLEO [9] experiments in e + e − collisions indicate that in the decays ψ → J/ψππ and Υ(2S) → Υ(1S)ππ the dipion system is produced predominantly in the spatially isotropic (S-wave) configuration, meaning that no angular momentum is transferred to it. Consequently, the angular momentum alignment is preserved in the transition from the 2S to the 1S state.…”

Section: Polarization Contributions From Feed-down Decaysmentioning

confidence: 99%

Observation ofχcandχbnuclear suppression via dilepton polarization measurements

Faccioli

Seixas

2012

Phys. Rev. D

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We demonstrate that it is possible to use the polarization of vector quarkonia, measured from dilepton event samples, as an instrument to study the suppression of χc and χ b in heavy-ion collisions, where a direct determination of signal yields involving the identification of low-energy photons is essentially impossible. A change of the observed J/ψ and Υ(1S) polarizations from proton-proton to central nucleus-nucleus collisions would directly reflect differences in the nuclear dissociation patterns of S and P states and may provide a strong indication for quarkonium sequential suppression in the quark-gluon plasma.

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Measurement of the mass and full width of theηcmeson

Cited by 14 publications

References 12 publications

Physics Accomplishments and Future Prospects of the BES Experiments at the Beijing Electron--Positron Collider

Physics Accomplishments and Future Prospects of the BES Experiments at the Beijing Electron--Positron Collider

Bottomonium physics above BB¯ thresholds with the Belle experiment

Observation ofχcandχbnuclear suppression via dilepton polarization measurements

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