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

Briere, R. A.; Harris, F. A.; Mitchell, R. E.

doi:10.1146/annurev-nucl-102115-044802

Cited by 7 publications

(9 citation statements)

References 146 publications

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“…The fit quality is estimated using a χ 2 -test method, with χ 2 /ndf = 93.6/110. Fit methods taken from previous experiments [1][2][3][4][5] are also tried and found to be not able to describe data. TABLE I: The measured masses and widths of the resonances from the fit to the e + e − → π + π − J/ψ cross section with three coherent Breit-Wigner functions.…”

Section: Results On the "Y" Statesmentioning

confidence: 99%

“…In the charmonium region, a large sample of ψ decays can be used to measure new decay modes of charmonium states. And at higher energies, BESIII is uniquely situated to explore questions concerning the still-unexplained XY Z states.BESIII has collected a variety of data sets for e + e − collisions with center-of-mass energies between 2.0 and 4.6 GeV [1]. A few of the highlights, from low to high energy, include: a scan of the region between 2.0 and 3.0 GeV; 1.3 billion J/ψ decays; 450 million ψ decays; 2.9 fb −1 of data at the ψ(3770) mass; about 3 fb −1 at 4.18 GeV (primarily for studies of the D s meson); 0.8 fb −1 in a scan of the region between 3.85 and 4.59 GeV (spread over 104 points); and over 4 fb −1 collected between 3.81 and 4.60 GeV (in sets ranging from 50 pb −1 to 1.1 fb −1 ) for studies of the XY Z states.…”

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confidence: 99%

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Results from Electron-Positron Collisions at BESIII

Mitchell¹

2017

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)

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A selection of results from electron-positron collisions at BESIII are reviewed. The results presented here illustrate the wide range of physics topics that can be studied using the Beijing Electron Positron Collider (BEPC). At low collision energies, the cross section for e + e − → π + π − provides much-needed input into theoretical calculations of the anomalous magnetic moment of the muon, and the reaction e + e − → pp provides access to the electromagnetic form factors of the proton. In the charmonium region, a large sample of ψ decays can be used to measure new decay modes of charmonium states. And at higher energies, BESIII is uniquely situated to explore questions concerning the still-unexplained XY Z states. PoS(ICHEP2016)600Results from BESIII Ryan E. Mitchell BESIII has collected a variety of data sets for e + e − collisions with center-of-mass energies between 2.0 and 4.6 GeV [1]. A few of the highlights, from low to high energy, include: a scan of the region between 2.0 and 3.0 GeV; 1.3 billion J/ψ decays; 450 million ψ decays; 2.9 fb −1 of data at the ψ(3770) mass; about 3 fb −1 at 4.18 GeV (primarily for studies of the D s meson); 0.8 fb −1 in a scan of the region between 3.85 and 4.59 GeV (spread over 104 points); and over 4 fb −1 collected between 3.81 and 4.60 GeV (in sets ranging from 50 pb −1 to 1.1 fb −1 ) for studies of the XY Z states. In addition to these fixed energies, one can also study e + e − collisions at any lower center-of-mass energy using the Initial State Radiation (ISR) technique, where photons are radiated from the primary e + or e − before the collision. The following represents a small selection of the recent results that have been derived from these data sets. Anomalous Magnetic Moment of the MuonThe difference between the Standard Model (SM) and the experimental (E821) values for the anomalous magnetic moment of the muon, a µ ≡ (g µ − 2)/2, is currently larger than 3σ :The error in the SM calculation is dominated by the Hadronic Vacuum Polarization (HVP) contribution, which is estimated using experimental input from e + e − collisions to hadrons. The cross section for e + e − collisions to hadrons, in turn, is dominated by the reaction e + e → π + π − in the region of the ρ meson, corresponding to collision energies between 600 and 900 MeV. But here there are experimental differences between BaBar and KLOE, as shown in Figure 1b, on the order of several sigma. If only the BaBar measurement is used in a SM µ , the difference between SM and experiment drops below 3σ . It is thus crucial to provide more experimental input. Letters B 753 (2016) 629-638 635 ed due to this efmoved by applying lgorithm. Here, the a MC sample that ter τ is determined rections for the raof 2%, one obtains is found to be ry and agree with as systematic unmethod (1) is used rection thin the Phokhara ry precise descrip-.5% [16]. polarization effects dressed cross secis adjusted for the and dressed cross (7) n the investigated ces are: ncertainty is student sources. Firstly, e data samples are n ...

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Section: Results On the "Y" Statesmentioning

confidence: 99%

mentioning

confidence: 99%

Results from Electron-Positron Collisions at BESIII

Mitchell¹

2017

Proceedings of 38th International Conference on High Energy Physics — PoS(ICHEP2016)

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“…More likely, the near-light-speed electron can induce spherical-shell-like negative and positive polarization charges that rotate contrarily to maintain the spin magnetic moment. Since near-lightspeed electron collisions can also produce the mesons and hadrons generated in high-energy proton collisions [2] (which certainly will eventually be fully verified), measuring the magnetostatic fields around polar particles has the equal experimental value as large collider experiments.…”

Section: Spin-related Conceptsmentioning

confidence: 98%

New Physics II: Spin Picture, Particle Structure, and Fundamental Interactions

Kang¹

2021

Preprint

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Experimental data sometimes fails to render the expected truth, such as high-speed bullets smashing into pieces on a water surface cannot verify the water's hardness. By re-examining the essence underneath quantum phenomena and analyzing their relevance to universal classical theory, this study has thoroughly revealed the classical counterpart of spin. From now on, almost all quantum concepts (e.g., wave particle duality, quantum entanglement, and magnetic moment anomaly) can be understood classically, just as prominent physicists such as Planck, Einstein, and Schrödinger longed for back then.

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“…More likely, the spin-vortex of a near-light-speed electron can pairwise induce negative-positive polarization charges (see §3.6) that spin contrarily to maintain the spin magnetic moment. Since near-light-speed electron collisions can produce the mesons and hadrons generated in highenergy proton collisions [2] (which will eventually be fully verified), measuring the magnetostatic fields around polar particles has the equivalent experimental value as large collider experiments.…”

Section: Spin-related Conceptsmentioning

confidence: 99%