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1

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Measurements of the center-of-mass energies of collisions at BESIII *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [et al.]

IOP Publishing ; 2021

In: Chinese Physics C Vol. 45, No. 10 ( 2021-10-01), p. 103001-

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In: Chinese Physics C, IOP Publishing, Vol. 45, No. 10 ( 2021-10-01), p. 103001-

Type of Medium: Online Resource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac1575

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2021

detail.hit.zdb_id: 2491278-5

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2

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Study of BESIII trigger efficiencies with the 2018 J/ψ data *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [et al.]

IOP Publishing ; 2021

In: Chinese Physics C Vol. 45, No. 2 ( 2021-02-01), p. 023002-

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In: Chinese Physics C, IOP Publishing, Vol. 45, No. 2 ( 2021-02-01), p. 023002-

Abstract: Using a dedicated data sample taken in 2018 on the J / ψ peak, we perform a detailed study of the trigger efficiencies of the BESIII detector. The efficiencies are determined from three representative physics processes, namely Bhabha scattering, dimuon production and generic hadronic events with charged particles. The combined efficiency of all active triggers approaches 100% in most cases, with uncertainties small enough not to affect most physics analyses.

Type of Medium: Online Resource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/abcfab

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2021

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3

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Measurements of sensor radiation damage in the ATLAS inner detector using leakage currents

Aad, G. ; Abbott, B. ; Abbott, D.C. ; [et al.]

IOP Publishing ; 2021

In: Journal of Instrumentation Vol. 16, No. 08 ( 2021-08-01), p. P08025-

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In: Journal of Instrumentation, IOP Publishing, Vol. 16, No. 08 ( 2021-08-01), p. P08025-

Abstract: Non-ionizing energy loss causes bulk damage to the silicon sensors of the ATLAS pixel and strip detectors. This damage has important implications for data-taking operations, charged-particle track reconstruction, detector simulations, and physics analysis. This paper presents simulations and measurements of the leakage current in the ATLAS pixel detector and semiconductor tracker as a function of location in the detector and time, using data collected in Run 1 (2010–2012) and Run 2 (2015–2018) of the Large Hadron Collider. The extracted fluence shows a much stronger | z |-dependence in the innermost layers than is seen in simulation. Furthermore, the overall fluence on the second innermost layer is significantly higher than in simulation, with better agreement in layers at higher radii. These measurements are important for validating the simulation models and can be used in part to justify safety factors for future detector designs and interventions.

Type of Medium: Online Resource

ISSN: 1748-0221

URL: Article

DOI: 10.1088/1748-0221/16/08/P08025

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2021

detail.hit.zdb_id: 2235672-1

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4

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Performance of the ATLAS RPC detector and Level-1 muon barrel trigger at √(s)=13 TeV

Aad, G. ; Abbott, B. ; Abbott, D.C. ; [et al.]

IOP Publishing ; 2021

In: Journal of Instrumentation Vol. 16, No. 07 ( 2021-07-01), p. P07029-

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In: Journal of Instrumentation, IOP Publishing, Vol. 16, No. 07 ( 2021-07-01), p. P07029-

Abstract: The ATLAS experiment at the Large Hadron Collider (LHC) employs a trigger system consisting of a first-level hardware trigger (L1) and a software-based high-level trigger. The L1 muon trigger system selects muon candidates, assigns them to the correct LHC bunch crossing and classifies them into one of six transverse-momentum threshold classes. The L1 muon trigger system uses resistive-plate chambers (RPCs) to generate the muon-induced trigger signals in the central (barrel) region of the ATLAS detector. The ATLAS RPCs are arranged in six concentric layers and operate in a toroidal magnetic field with a bending power of 1.5 to 5.5 Tm. The RPC detector consists of about 3700 gas volumes with a total surface area of more than 4000 m 2 . This paper reports on the performance of the RPC detector and L1 muon barrel trigger using 60.8 fb -1 of proton-proton collision data recorded by the ATLAS experiment in 2018 at a centre-of-mass energy of 13 TeV. Detector and trigger performance are studied using Z boson decays into a muon pair. Measurements of the RPC detector response, efficiency, and time resolution are reported. Measurements of the L1 muon barrel trigger efficiencies and rates are presented, along with measurements of the properties of the selected sample of muon candidates. Measurements of the RPC currents, counting rates and mean avalanche charge are performed using zero-bias collisions. Finally, RPC detector response and efficiency are studied at different high voltage and front-end discriminator threshold settings in order to extrapolate detector response to the higher luminosity expected for the High Luminosity LHC.

Type of Medium: Online Resource

ISSN: 1748-0221

URL: Article

DOI: 10.1088/1748-0221/16/07/P07029

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2021

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5

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The ATLAS Fast TracKer system

Aad, G. ; Abbott, B. ; Abbott, D.C. ; [et al.]

IOP Publishing ; 2021

In: Journal of Instrumentation Vol. 16, No. 07 ( 2021-07-01), p. P07006-

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In: Journal of Instrumentation, IOP Publishing, Vol. 16, No. 07 ( 2021-07-01), p. P07006-

Abstract: The ATLAS Fast TracKer (FTK) was designed to provide full tracking for the ATLAS high-level trigger by using pattern recognition based on Associative Memory (AM) chips and fitting in high-speed field programmable gate arrays. The tracks found by the FTK are based on inputs from all modules of the pixel and silicon microstrip trackers. The as-built FTK system and components are described, as is the online software used to control them while running in the ATLAS data acquisition system. Also described is the simulation of the FTK hardware and the optimization of the AM pattern banks. An optimization for long-lived particles with large impact parameter values is included. A test of the FTK system with the data playback facility that allowed the FTK to be commissioned during the shutdown between Run 2 and Run 3 of the LHC is reported. The resulting tracks from part of the FTK system covering a limited η–ϕ region of the detector are compared with the output from the FTK simulation. It is shown that FTK performance is in good agreement with the simulation.

Type of Medium: Online Resource

ISSN: 1748-0221

URL: Article

DOI: 10.1088/1748-0221/16/07/P07006

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2021

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6

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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. ; [et al.]

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-

Abstract: 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.

Type of Medium: Online Resource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac80b4

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2022

detail.hit.zdb_id: 2491278-5

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7

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Number of J/ψ events at BESIII *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [et al.]

IOP Publishing ; 2022

In: Chinese Physics C Vol. 46, No. 7 ( 2022-07-01), p. 074001-

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In: Chinese Physics C, IOP Publishing, Vol. 46, No. 7 ( 2022-07-01), p. 074001-

Abstract: Using inclusive decays of , a precise determination of the number of events collected with the BESIII detector was performed. For the two data sets taken in 2009 and 2012, the numbers of events were recalculated to be and , respectively; these numbers are in good agreement with the previous measurements. For the sample taken in 2017–2019, the number of events was determined to be . The total number of events collected with the BESIII detector was determined to be , where the uncertainty is dominated by systematic effects, and the statistical uncertainty is negligible.

Type of Medium: Online Resource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac5c2e

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2022

detail.hit.zdb_id: 2491278-5

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8

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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. ; [et al.]

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-

Abstract: 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.

Type of Medium: Online Resource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac84cc

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2022

detail.hit.zdb_id: 2491278-5

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9

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Search for the weak decay *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [et al.]

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-

Abstract: 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.

Type of Medium: Online Resource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ac9895

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2023

detail.hit.zdb_id: 2491278-5

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10

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Observation of *

Ablikim, M. ; Achasov, M. N. ; Adlarson, P. ; [et al.]

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-

Abstract: 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.

Type of Medium: Online Resource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/acb6eb

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2023

detail.hit.zdb_id: 2491278-5

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