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Measurement of muon-induced neutron yield at the China Jinping Underground Laboratory

Chinese Physics C 2022年第8期46卷 211-219页

作者： Lin Zhao Wentai Luo Lars Bathe-Peters Shaomin Chen Mourad Chouaki Wei Dou Lei Guo Ziyi Guo Ghulam Hussain Jinjing Li Ye Liang Qian Liu Guang Luo Ming Qi Wenhui Shao Jian Tang Linyan Wan Zhe Wang Yiyang Wu Benda Xu Tong Xu Weiran Xu Yuzi Yang Minfang Yeh Aiqiang Zhang Bin Zhang jne collaboration Department of Engineering Physics Tsinghua UniversityBeijing 100084China Center for High Energy Physics Tsinghua UniversityBeijing 100084China Key Laboratory of Particle&Radiation Imaging(Tsinghua University) Ministry of EducationChina Institut für Physik Technische Universität BerlinBerlin 10623Germany École Polytechnique Fédérale de Lausanne Lausanne 1015Switzerland School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China School of Physics Nanjing UniversityNanjing 210093China Brookhaven National Laboratory UptonNew York 11973USA 不详

Solar,terrestrial,and supernova neutrino experiments are subject to muon-induced radioactive *** China Jinping Underground Laboratory(CJPL),with its unique advantage of a 2400 m rock coverage and long distance from nuclear power plants,is ideal for MeV-scale neutrino *** a 1-ton prototype detector of the Jinping Neutrino Experiment(jne),we detected 3 43 high-energy cosmic-ray muons and(7.86±3.97)muon-induced neutrons from an 820.28-day dataset at the first phase of CJPL(CJPL-I).Based on the muon-induced neutrons,we measured the corresponding muon-induced neutron yield in a liquid scintillator to be(3.44±1.86_(stat.)±0.76_(syst.))×10^(-4) μ^(-1)g^(-1)cm^(2) at an average muon energy of 340 *** provided the first study for such neutron background at CJPL.A global fit including this measurement shows a power-law coefficient of(0.75±0.02) for the dependence of the neutron yield at the liquid scintillator on muon energy.

关键词： Underground laboratory neutrino detector cosmic-ray muon neutron yield liquid scintillator

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Amplitude analysis of the decays D0→π+π-π+π- and D0→π+π-π0π0

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Chinese Physics C 2024年第8期 9-36页

作者： BESⅢ collaboration

Using e+e-annihilation data corresponding to an integrated luminosity of 2.93 fb-1taken at the centerof-mass energy s1/2=3.773 GeV with the BESⅢ detector,a joint amplitude analysis is performed on the decays D0→π+π-π+π-and D0→π+π-π0π0（non-η）.The fit fractions of individual components are obtained,and large interferences among the dominant components of the decays D0→a1（1260）π,D0→π（1300）π,D0→ρ（770）ρ（770）,and D0→2（ππ）S are observed in both *** the obtained amplitude model,the CP-even fractions of D0→π+π-π+π-and D0→π+π-π0π0（non-η） are determined to be(75.2±1.1stat.±1.5syst.) % and(68.9±1.5stat.±2.4syst.)%,*** branching fractions of D0→π+π-π+π-and D0→π+π-π0π0（non-η）are measured to be(0.688±0.010stat.±0.010syst.)% and(0.951±0.025stat.±0.021syst.)%,*** amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D0→4π when used to determine the CKM angle γ（φ3） via the B-→DK-decay.

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Performance and calibration of quark/gluon-jet taggers using 140 fb-1 of pp collisions at s1/2=13 TeV with the ATLAS detector

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Chinese Physics C 2024年第2期 5-29页

作者： The ATLAS collaboration

The identification of jets originating from quarks and gluons, often referred to as quark/gluon tagging,plays an important role in various analyses performed at the Large Hadron Collider, as Standard Model measurements and searches for new particles decaying to quarks often rely on suppressing a large gluon-induced background. This paper describes the measurement of the efficiencies of quark/gluon taggers developed within the ATLAS collaboration, using s1/2=13 TeV proton–proton collision data with an integrated luminosity of 140 fb-1collected by the ATLAS experiment. Two taggers with high performances in rejecting jets from gluon over jets from quarks are studied: one tagger is based on requirements on the number of inner-detector tracks associated with the jet, and the other combines several jet substructure observables using a boosted decision tree. A method is established to determine the quark/gluon fraction in data, by using quark/gluon-enriched subsamples defined by the jet pseudorapidity. Differences in tagging efficiency between data and simulation are provided for jets with transverse momentum between 500 GeV and 2 TeV and for multiple tagger working points.

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Determination of the number of ψ(3686) events taken at BESⅢ

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Chinese Physics C 2024年第9期 12-24页

作者： BESⅢ collaboration

The number of ψ(3686) events collected by the BESⅢ detector during the 2021 run period is determined to be(2259.3±11.1)×10～6 by counting inclusive ψ(3686) hadronic *** uncertainty is systematic and the statistical uncertainty is ***,the numbers of ψ(3686) events collected during the 2009 and 2012run periods are updated to be(107.7±0.6)×10～6 and(345.4±2.6)×10～6,*** numbers are consistent with the previous measurements within one standard *** total number of ψ(3686) events in the three data samples is(2712.4±14.3)×10～6.

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Measurement of solar pp neutrino flux using electron recoil data from PandaX-4T commissioning run

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Chinese Physics C 2024年第9期 5-11页

作者： PandaX collaboration

The proton-proton（pp） fusion chain dominates the neutrino production in the *** uncertainty of the predicted pp neutrino flux is at the sub-percent level,whereas that of the best measurement is O（10%）.In this study,for the first time,we measure solar pp neutrinos in the electron recoil energy range from 24 to 144 keV using the PandaX-4T commissioning data with 0.63 tonne × year *** pp neutrino flux is determined as(8.0±3.9（stat）±10.0（syst）)×1010 s-1cm-2,which is consistent with the Standard Solar Model and existing measurements,corresponding to an upper flux limit of 23.3×1010s-1cm-2at 90% C.L..

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The FAST all sky HI survey(FASHI):The first release of catalog

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 112-133页

作者： Chuan-Peng Zhang Ming Zhu Peng Jiang Cheng Cheng Jing Wang Jie Wang Jin-Long Xu Xiao-Lan Liu Nai-Ping Yu Lei Qian Haiyang Yu Mei Ai Yingjie Jing Chen Xu Ziming Liu Xin Guan Chun Sun Qingliang Yang Menglin Huang Qiaoli Hao FAST collaboration Guizhou Radio Astronomical Observatory Guizhou UniversityGuiyang 550000China National Astronomical Observatories Chinese Academy of Sciences(CAS)Beijing 100101China Chinese Academy of Sciences South America Center for Astronomy National Astronomical ObservatoriesCASBeijing 100101China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China

The FAST All Sky HI survey(FASHI)was designed to cover the entire sky observable by the Five-hundred-meter Aperture Spherical radio Telescope(FAST),spanning approximately 22000 square degrees of declination between-14°and+66°,and in the frequency range of 1050-1450 MHz,with the expectation of eventually detecting more than 100000 HI *** August 2020 and June 2023,FASHI had covered more than 7600 square degrees,which is approximately 35%of the total sky observable by *** has a median detection sensitivity of around 0.76 m Jy beam-1and a spectral line velocity resolution of~6.4 km s-1at a frequency of~1.4 *** of now,a total of 41741 extragalactic HI sources have been detected in the frequency range 1305.5-1419.5 MHz,corresponding to a redshift limit of z■*** cross-matching FASHI sources with the Siena Galaxy Atlas(SGA)and the Sloan Digital Sky Survey(SDSS)catalogs,we found that 16972(40.7%)sources have spectroscopic redshifts and 10975(26.3%)sources have only photometric *** of the remaining 13794(33.0%)HI sources are located in the direction of the Galactic plane,making their optical counterparts difficult to identify due to high extinction or high contamination of Galactic stellar *** on current survey results,the FASHI survey is an unprecedented blind extragalactic H I *** has higher spectral and spatial resolution and broader coverage than the Arecibo Legacy Fast ALFA Survey(ALFALFA).When completed,FASHI will provide the largest extragalactic HI catalog and an objective view of HI content and large-scale structure in the local universe.

关键词： surveys redshifts galaxies telescope radio lines HI line

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Probing the internal structure of baryons

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National Science Review 2021年第11期8卷 54-61页

作者： Guangshun Huang Rinaldo Baldini Ferroli BESⅢ collaboration Department of Modern Physics University of Science and Technology of China State Key Laboratory of Particle Detection and Electronics INFN Laboratori Nazionali di Frascati Institute of High Energy Physics Chinese Academy of Sciences

Electromagnetic form factors are fundamental observables that describe the electric and magnetic structure of hadrons and provide keys to understand the strong interaction. At the Beijing Spectrometer(BESⅢ),form factors have been measured for different baryons in the time-like region for the first time or with the best precision. The results are presented with examples focused on but not limited to the proton/neutron,the, with a strange quark, and the c, with a charm quark.

关键词： baryon structure form factor threshold effect abnormal production

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Low-power SiPM readout BETA ASIC for space applications

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Nuclear Science and Techniques 2024年第3期35卷 153-169页

作者： Anand Sanmukh Sergio Gómez Albert Comerma Joan Mauricio Rafel Manera Andreu Sanuy Daniel Guberman Roger Catala Albert Espinya Marina Orta Oscar de la Torre David Gascon Departament de Física Quàntica i Astrofísica(FQA) Institut de Ciències del Cosmos(ICCUB)Universitat de Barcelona(UB)08028 BarcelonaSpain Institut d’Estudis Espacials de Catalunya(IEEC) 08034 BarcelonaSpain Electronics Department Serra Hunter fellow at Polytechnic University of Catalonia(UPC)08019 BarcelonaSpain

The BETA application-specific integrated circuit(ASIC)is a fully programmable chip designed to amplify,shape and digitize the signal of up to 64 Silicon photomultiplier(SiPM)channels,with a power consumption of approximately~1 mW/*** to its dual-path gain,the BETA chip is capable of resolving single photoelectrons(phes)with a signal-to-noise ratio(SNR)>5 while simultaneously achieving a dynamic range of~4000 ***,BETA can provide a cost-effective solution for the readout of SiPMs in space missions and other applications with a maximum rate below 10 *** this study,we describe the key characteristics of the BETA ASIC and present an evaluation of the performance of its 16-channel version,which is implemented using 130 nm *** ASIC also contains two discriminators that can provide trigger signals with a time jitter down to 400 ps FWHM for 10 *** linearity error of the charge gain measurement was less than 2%for a dynamic range as large as 15 bits.

关键词： Radiation detectors Silicon photomultipliers Photon sensors Front-end electronics Mixed-mode ASICs Space technology

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Search for the rare decays W+→ Ds+γ and Z → Dγ0 at LHCb

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Chinese Physics C 2023年第9期 18-30页

作者： LHCb collaboration

A search for the rare decays W+→ Ds+γ and Z → Dγ0is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 2.0 fb-1. No significant signal is observed for either decay mode and upper limits on their branching fractions are set using W+→ μ+ν and Z → μ+μ-decays as normalization channels. The upper limits are 6.5 × 10-4and2.1 × 10-3at 95% confidence level for the W+→ Ds+γ and Z → Dγ0decay modes, respectively. This is the first reported search for the Z → Dγ0decay, while the upper limit on the W+→ Ds+γ branching fraction improves upon the previous best limit.

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Search for the doubly heavy baryon ■ decaying to ■

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Chinese Physics C 2023年第9期 5-17页

作者： LHCb collaboration

A first search for the ■decay is performed by the LHCb experiment with a data sample of proton-proton collisions, corresponding to an integrated luminosity of 9 fb-1recorded at centre-of-mass energies of 7, 8, and 13 TeV. Two peaking structures are seen with a local(global) significance of 4.3(2.8) and 4.1(2.4) standard deviations at masses of 6571 and 6694 MeV/c2, respectively. Upper limits are set on the ■ baryon production cross-section times the branching fraction relative to that of the ■ decay at centre-of-mass energies of 8 and 13 TeV, in the ■ and in the Bc+rapidity and transverse-momentum ranges from 2.0 to 4.5 and 0 to 20 GeV/c,respectively. Upper limits are presented as a function of the ■ mass and lifetime.

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