Observation of 
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doi:10.1103/physrevlett.118.112001

Cited by 46 publications

(47 citation statements)

References 22 publications

(4 reference statements)

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“…the so-called X,Y,Z states, like the X(3872) state [3] or the P c pentaquark candidates [4]. More exciting experimental data are expected from the B-factories Belle II [5] and BESIII [6], the LHCb experiment [7], the PANDA experiment at FAIR [8] and at a future Super-c-τ Factory [9].…”

Section: Introductionmentioning

confidence: 99%

How much do charm sea quarks affect the charmonium spectrum?

2019

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The properties of charmonium states are or will be intensively studied by the B-factories Belle II and BESIII, the LHCb and PANDA experiments and at a future Super-c-τ Factory. Precise lattice calculations provide valuable input and several results have been obtained by simulating up, down and strange quarks in the sea. We investigate the impact of a charm quark in the sea on the charmonium spectrum, the renormalization group invariant charm-quark mass M c and the scalar charm-quark content of charmonium. The latter is obtained by the direct computation of the mass-derivatives of the charmonium masses. We do this investigation in a model, QCD with two degenerate charm quarks. The absence of light quarks allows us to reach very small lattice spacings down to 0.023 fm. By comparing to pure gauge theory we find that charm quarks in the sea affect the hyperfine splitting at a level below 2%. The most significant effects are 5% in M c and 3% in the value of the charm quark content of the η c meson. Given that we simulate two charm quarks these estimates are upper bounds for the contribution of a single charm quark. We show that lattice spacings < 0.06 fm are needed for safe continuum extrapolations of the charmonium spectrum with O(a) improved Wilson quarks. A useful relation for the projection to the desired parity of operators in two-point functions computed with twisted mass fermions is proven.

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Section: Introductionmentioning

confidence: 99%

How much do charm sea quarks affect the charmonium spectrum?

2019

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“…Notable achievements of the BES and BESII phases of this program include: BES's first result, which was a five-fold improvement in the precision of the τ -lepton's measured mass that was two standard deviations lower than the previous world average value at that time and cleared up a discrepancy with SM expectations [21]; the first observation of the purely leptonic D + s → µ + ν decay process [22]; precision measurements of the annihilation cross section for e + e − → hadrons that provided essential inputs to the SM predictions for the Higgs boson mass and the anomalous magnetic moment of the muon, (g − 2) µ [23]; the discoveries of the σ(500) [24] and κ(700) [25] scalar mesons; and a comprehensive study of the so-called ρπ puzzle in vector charmonium decays [26].…”

Section: Introductionmentioning

confidence: 99%

The BESIII physics programme

Yuan

Olsen

2019

Nat Rev Phys

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The standard model of particle physics is a well-tested theoretical framework, but there are still a number of issues that deserve further experimental and theoretical investigation. For quark physics, such questions include: the nature of quark confinement, the mechanism that connects the quarks and gluons of the standard model theory to the strongly interacting particles; and the weak decays of quarks, which may provide insights into new physics mechanisms responsible for the matter-antimatter asymmetry of the Universe. These issues are addressed by the Beijing Spectrometer III (BESIII) experiment at the Beijing Electron-Positron Collider II (BEPCII) storage ring, which for the past decade has been studying particles produced in electron-positron collisions in the tau-charm energy-threshold region, and has by now accumulated the world's largest datasets that enables searches for nonstandard hadrons, weak decays of the charmed particles, and new physics phenomena beyond the standard model. Here, we review the contributions of BESIII to such studies and discuss future prospects for BESIII and other experiments.

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“…We can take a S-wave and a P-wave diquark-antidiquark pair to construct the vector tetraquark states, or introduce an explicit P-wave in the S-wave diquark-antidiquark pair to construct the vector tetraquark states [15]. Experimentally, the Y (4260) observed by the BaBar collaboration [6], the Y (4220), Y (4390) and Y (4320) observed by the BESIII collaboration [7,8], the Y (4360), Y (4660), Y (4630) observed by the Belle collaboration [9,10] are excellent candidates for the vector tetraquark states. According to the analogous masses and widths, the Y (4260) and Y (4220) maybe the same particle, the Y (4360) and Y (4320) maybe the same particle, the Y (4660) and Y (4630) maybe the same particle.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the vector tetraquark states with P-waves between the diquarks and antidiquarks via the QCD sum rules

Wang

2019

Eur. Phys. J. C

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In this article, we introduce a P-wave between the diquark and antidiquark explicitly to construct the vector tetraquark currents, and study the vector tetraquark states with the QCD sum rules systematically, and obtain the lowest vector tetraquark masses up to now. The present predictions support assigning the Y (4220/4260), Y (4320/4360), Y (4390) and Z(4250) to be the vector tetraquark states with a relative P-wave between the diquark and antidiquark pair.

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Observation of Λc+→nKS0π

Cited by 46 publications

References 22 publications

How much do charm sea quarks affect the charmonium spectrum?

How much do charm sea quarks affect the charmonium spectrum?

The BESIII physics programme

Analysis of the vector tetraquark states with P-waves between the diquarks and antidiquarks via the QCD sum rules

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