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Future Physics Programme of BESIII *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [weitere]

IOP Publishing ; 2020

In: Chinese Physics C Vol. 44, No. 4 ( 2020-04-01), p. 040001-

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In: Chinese Physics C, IOP Publishing, Vol. 44, No. 4 ( 2020-04-01), p. 040001-

Kurzfassung: There has recently been a dramatic renewal of interest in hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plethora of charmonium-like XYZ states at BESIII and B factories, and the observation of an intriguing proton-antiproton threshold enhancement and the possibly related X (1835) meson state at BESIII, as well as the threshold measurements of charm mesons and charm baryons. We present a detailed survey of the important topics in tau-charm physics and hadron physics that can be further explored at BESIII during the remaining operation period of BEPCII. This survey will help in the optimization of the data-taking plan over the coming years, and provides physics motivation for the possible upgrade of BEPCII to higher luminosity.

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/44/4/040001

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2020

ZDB Id: 2491278-5

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2

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Evidence for the decays of and *

Ablikim, M. ; Achasov, M. N. ; Ahmed, S. ; [weitere]

IOP Publishing ; 2019

In: Chinese Physics C Vol. 43, No. 8 ( 2019-08-01), p. 083002-

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In: Chinese Physics C, IOP Publishing, Vol. 43, No. 8 ( 2019-08-01), p. 083002-

Kurzfassung: We study the hadronic decays of to the final states and , using an annihilation data sample of 567 pb -1 taken at a center-of-mass energy of 4.6 GeV with the BESIII detector at the BEPCII collider. We find evidence for the decays and with statistical significance of and , respectively. Normalizing to the reference decays and , we obtain the ratios of the branching fractions and to be and , respectively. The upper limits at the 90% confidence level are set to be and . Using BESIII measurements of the branching fractions of the reference decays, we determine % ( 〈 0.68%) and % ( 〈 1.9%). Here, the first uncertainties are statistical and the second systematic. The obtained branching fraction of is consistent with the previous measurement, and the branching fraction of is measured for the first time.

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/43/8/083002

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2019

ZDB Id: 2491278-5

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3

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Observation of ${{e^+e^- \rightarrow D_s^+} \overline{ D}^{\bf (*)0} {K^-}}$ and study of the P -wave ${{D_s}}$ mesons

Ablikim, M. ; Achasov, M. N. ; Ahmed, S. ; [weitere]

IOP Publishing ; 2019

In: Chinese Physics C Vol. 43, No. 3 ( 2019-03), p. 031001-

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In: Chinese Physics C, IOP Publishing, Vol. 43, No. 3 ( 2019-03), p. 031001-

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/43/3/031001

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2019

ZDB Id: 2491278-5

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4

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Observation of the Y(4230) and a new structure in *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [weitere]

IOP Publishing ; 2022

In: Chinese Physics C Vol. 46, No. 11 ( 2022-11-01), p. 111002-

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In: Chinese Physics C, IOP Publishing, Vol. 46, No. 11 ( 2022-11-01), p. 111002-

Kurzfassung: The cross sections of at center-of-mass energies from 4.127 to 4.600 GeV are measured based on 15.6 fb data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in the line shape of the cross sections. The mass and width of the first structure are measured to be ( ) MeV and ( ) MeV, respectively. They are consistent with those of the established . The second structure is observed for the first time with a statistical significance greater than 8 σ , denoted as . Its mass and width are determined to be ( ) MeV and ( ) MeV, respectively. The first presented uncertainties are statistical and the second ones are systematic. The product of the electronic partial width with the decay branching fraction is reported.

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac945c

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2022

ZDB Id: 2491278-5

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5

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Search for the weak decay *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [weitere]

IOP Publishing ; 2023

In: Chinese Physics C Vol. 47, No. 1 ( 2023-01-01), p. 013002-

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In: Chinese Physics C, IOP Publishing, Vol. 47, No. 1 ( 2023-01-01), p. 013002-

Kurzfassung: Using events collected with the BESIII detector, we perform the first search for the weak baryonic decay . The analysis procedure is optimized using a blinded method. No significant signal is observed, and the upper limit on the branching fraction ( ) of is set as at the 90% confidence level.

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac9895

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2023

ZDB Id: 2491278-5

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6

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Observations of the Cabibbo-Suppressed decays , and the Cabibbo-Favored decay *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [weitere]

IOP Publishing ; 2023

In: Chinese Physics C Vol. 47, No. 2 ( 2023-02-01), p. 023001-

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In: Chinese Physics C, IOP Publishing, Vol. 47, No. 2 ( 2023-02-01), p. 023001-

Kurzfassung: Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb , collected by the BESIII detector in the energy region between and , we report the first observations of the Cabibbo-suppressed decays , , and the Cabibbo-favored decay with statistical significances of , , and , respectively. The branching fractions of these decays are measured to be %, %, and %, where the first uncertainties are statistical and the second are systematic. We find that the branching fraction of the decay is about one order of magnitude higher than that of .

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac9d29

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2023

ZDB Id: 2491278-5

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7

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Observation of *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [weitere]

IOP Publishing ; 2023

In: Chinese Physics C Vol. 47, No. 4 ( 2023-04-01), p. 043001-

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In: Chinese Physics C, IOP Publishing, Vol. 47, No. 4 ( 2023-04-01), p. 043001-

Kurzfassung: Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESIII detector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 , the process is observed for the first time with a statistical significance of . The average Born cross sections in the energy ranges of (4.160, 4.380) GeV, (4.400, 4.600) GeV and (4.610, 4.700) GeV are measured to be fb, fb and fb, respectively, where the first uncertainties are statistical and the second are systematic. The line shapes of the and invariant mass spectra are consistent with phase space distributions, indicating that no hexaquark or di-baryon state is observed.

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/acb6eb

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2023

ZDB Id: 2491278-5

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8

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Search for hidden-charm tetraquark with strangeness in *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [weitere]

IOP Publishing ; 2023

In: Chinese Physics C Vol. 47, No. 3 ( 2023-03-01), p. 033001-

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In: Chinese Physics C, IOP Publishing, Vol. 47, No. 3 ( 2023-03-01), p. 033001-

Kurzfassung: We report a search for a heavier partner of the recently observed state, denoted as , in the process , based on collision data collected at the center-of-mass energies of , 4.682 and 4.699 GeV with the BESIII detector. The is of interest as it is expected to be a candidate for a hidden-charm and open-strange tetraquark. A partial-reconstruction technique is used to isolate recoil-mass spectra, which are probed for a potential contribution from ( ). We find an excess of ( ) candidates with a significance of , after considering systematic uncertainties, at a mass of . As the data set is limited in size, the upper limits are evaluated at the 90% confidence level on the product of the Born cross sections ( ) and the branching fraction ( ) of , under different assumptions of the mass from 4.120 to 4.140 MeV and of the width from 10 to 50 MeV at the three center-of-mass energies. The upper limits of are found to be at the level of pb at each energy. Larger data samples are needed to confirm the state and clarify its nature in the coming years.

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/acac69

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2023

ZDB Id: 2491278-5

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9

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Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV*

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [weitere]

IOP Publishing ; 2022

In: Chinese Physics C Vol. 46, No. 11 ( 2022-11-01), p. 113002-

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In: Chinese Physics C, IOP Publishing, Vol. 46, No. 11 ( 2022-11-01), p. 113002-

Kurzfassung: The integrated luminosities of data samples collected in the BESIII experiment in 2016–2017 at center-of-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhabha scattering events. The integrated luminosities of old datasets collected in 2010–2014 are updated by considering corrections related to detector performance, offsetting the effect of newly discovered readout errors in the electromagnetic calorimeter, which can haphazardly occur.

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac80b4

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2022

ZDB Id: 2491278-5

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10

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Luminosities and energies of e + e − collision data taken between =4.61 GeV and 4.95 GeV at BESIII*

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [weitere]

IOP Publishing ; 2022

In: Chinese Physics C Vol. 46, No. 11 ( 2022-11-01), p. 113003-

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In: Chinese Physics C, IOP Publishing, Vol. 46, No. 11 ( 2022-11-01), p. 113003-

Kurzfassung: From December 2019 to June 2021, the BESIII experiment collected approximately 5.85 fb −1 of data at center-of-mass energies between 4.61 and 4.95 GeV. This is the highest collision energy BEPCII has reached to date. The accumulated annihilation data samples are useful for studying charmonium(-like) states and charmed-hadron decays. By adopting a novel method of analyzing the production of pairs in annihilation, the center-of-mass energies are measured with a precision of 0.6 MeV. Integrated luminosities are measured with a precision of better than 1% by analyzing the events of large-angle Bhabha scattering. These measurements provide important inputs to analyses based on these data samples.

Materialart: Online-Ressource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac84cc

Sprache: Unbekannt

Verlag: IOP Publishing

Publikationsdatum: 2022

ZDB Id: 2491278-5

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