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Lepton-portal dark matter in hidden valley model and the dampe recent results

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Science China(Physics,Mechanics & Astronomy) 2018年第10期61卷 14-18页

作者： Yi-Lei Tang Lei Wu Mengchao Zhang Rui Zheng School of Physics Korea Institute for Advanced Study (KIAS) Department of Physics and Institute of Theoretical Physics Nanjing Normal University Center for Theoretical Physics of the Universe Institute for Basic Science (IBS) Department of Physics University of California

We study the recent e±cosmic ray excess reported by dampe in a Hidden Valley Model with lepton-portal dark matter. We find the electron-portal can account for the excess well and satisfy the DM relic density and direct detection bounds, while electron+muon/electron+muon+tau-portal suffers from strong constraints from lepton flavor violating observables, such as μ→3 e. We also discuss possible collider signatures of our model, both at the LHC and a future 100 Te V hadron collider.

关键词： dark matter dampe LHC

Design of the readout electronics for the dampe Silicon Tracker detector

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Chinese Physics C 2016年第11期40卷 143-151页

作者：张飞彭文溪龚轲吴帝董亦凡乔锐樊瑞睿汪锦州王焕玉 Xin Wu Daniel La Marra Philipp Azzarello Valentina Gallo Giovanni Ambrosi Andrea,Nardinocchi Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049China Département de Physique Nucleaire et Corpusculaire University of GenevaGeneva 1211Switzerland Istituto Nazionale di Fisica Nucleare Sezione di Perugia Perugia 06100Italy Universitaa di Perugia Perugia 06100Italy

The Silicon Tracker （STK） is one of the detectors of the dampe satellite used to measure the incidence direction of high energy cosmic rays. It consists of 6 X-Y double layers of silicon micro-strip detectors with 73728 readout channels. It is a great challenge to read out the channels and process the huge volume of data in the harsh environment of space. 1152 Application Specific Integrated Circuits （ASIC） and 384 ADCs are used to read out the detector channels. 192 Tracker Front-end Hybrid （TFH） modules and 8 identical Tracker Readout Board （TRB） modules are designed to control and digitalize the front signals. In this paper, the design of the readout electronics for the STK and its performance are presented in detail.

关键词： dampe readout electronics silicon strip detector VA140

Nearby dark matter subhalo that accounts for the dampe excess

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Chinese Physics C 2019年第8期43卷 124-129页

作者： Yi Zhao Xiao-Jun Bi Su-Jie Lin Peng-Fei Yin College of Physics and Materials Science Tianjin Normal UniversityTianjin 300387China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

The precise spectrum of electrons and positrons at high energies plays an important role in understanding their origin. DArk Matter Particle Explorer has reported their first measurement of the e^+e^- spectrum from 25 GeV to 4.6 TeV. This spectrum reveals a tentative peak at ~1.4 TeV, which requires a nearby source of e^+e^-. In this work, we study the properties of a large nearby dark matter subhalo that accouns for this spectral peak, such as its mass and distance from Earth, for different concentration models. We compare spectra of the sources in 3FGL with that from DM annihilation in the subhalo, and find ten candidates that have comparable gamma-ray spectra. However, according to the N-body simulation, the probability that such a large subhalo is close enough to Earth is less than 0.1%.

关键词： dark matter dampe

Calibration of the dampe Plastic Scintillator Detector and its on-orbit performance

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Research in Astronomy and Astrophysics 2019年第3期19卷 145-154页

作者： Meng Ding Ya-Peng Zhang Yong-Jie Zhang Yuan-Peng Wang Tie-Kuang Dong Antonio De Benedittis Paolo Bernardini Fang Fang Yao Li Jie Liu Peng-Xiong Ma Zhi-Yu Sun Valentina Gallo Stefania Vitillo Zhao-Min Wang Yu-Hong Yu Chuan Yue Qiang Yuan Yong Zhou Yun-Long Zhang Institute of Modern Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences School of Astronomy and Space Science University of Science and Technology of China Istituto Nazionale di Fisica Nucleare (INFN) - Sezione di Lecce Dipartimento di Matematica e Fisica E.De Giorgi Universit`a del Salento Department of Nuclear and Particle Physics University of Geneva Gran Sasso Science Institute INFN Laboratori Nazionali del Gran Sasso Department of Modern Physics University of Science and Technology of China

The DArk Matter Particle Explorer(dampe) is a space-borne apparatus for detecting the highenergy cosmic-ray-like electrons, γ-rays, protons and heavy ions. The Plastic Scintillator Detector(PSD)is the top-most sub-detector of the dampe. The PSD is designed to measure the charge of incident highenergy particles and it also serves as a veto detector for discriminating γ-rays from charged particles. In this paper, a PSD on-orbit calibration procedure is described, which includes the five steps of pedestal, dynode correlation, response to minimum-ionizing particles, light attenuation function and energy reconstruction.A method for reconstructing the charge of incident high energy cosmic-ray particles is introduced. The detection efficiency of each PSD strip is verified to be above 99.5%; the total efficiency of the PSD for charged particles is above 99.99%.

关键词： cosmic ray instrumentation: dampe charge measurement plastic scintillator detector calibration

Onboard calibration circuit for the dampe BGO calorimeter front-end electronics

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Chinese Physics C 2016年第5期40卷 51-57页

作者：张德良封常青张俊斌王奇马思源沈仲弢蒋荻高山山张云龙郭建华刘树彬安琪 Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Sta te Key Laboratory of Particle Detection and Electronics(IHEP-USTC)Hefei 230026China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210008China

dampe （DArk Matter Particle Explorer） is a scientific satellite which is mainly aimed at indirectly searching for clark matter in st）ace. One critical sub-detector of the dampe payload is the BGO （bismuth germanium oxide） calorimeter, which contains 1848 PMT （photomultiplier tube） dynodes and 16 FEE （Front-End Electronics） boards. VA160 and VATA160, two 32-channel low power ASICs （Application Specific Integrated Circuits）, are adopted as the key components on the FEEs to perform charge measurement for the PMT signals. In order to inonitor the parameter drift which may be caused by temperature variation, aging, or other environmental factors, an onboard calibration circuit is designed for the VA160 and VATA160 ASICs. It is mainly composed of a 12-bit DAC （Digital to Analog Converter）, an operatioual amplifier and an analog switch. Test results showed that a dynamic range of 0- 30 pC with a precision of 5 fC （Root Meam Square, RMS） was achieved, which covers the VA160＇s input range. It can be used to compensate for the teinperature drift and test the trigger function of the FEEs. The calibration circuit has been implemented for the front-end electronics of the BGO Calorimeter and verified by all the environmental tests for both Qualification Model and Flight Model of dampe. The dampe satellite was launched at the end of 2015 and the calibration circuit will operate periodically in space.

关键词： dampe BGO calorimeter front-end electronics calibration circuit VA160

Off line software for the dampe experiment

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Chinese Physics C 2017年第10期41卷 123-130页

作者：王驰刘栋魏逸丰张志永张云龙汪晓莲许咨宗黄光顺 Andrii Tykhonov 吴欣藏京京刘杨蒋维文思成伍健常进 State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Department of Modern Physics University of Science and Technology of China DPNC Université de Genève Purple Mountain Observatory Chinese Academy of Sciences

A software system has been developed for the DArk Matter Particle Explorer（dampe） mission, a satellite-based experiment. The dampe software is mainly written in C＋＋ and steered using a Python script. This article presents an overview of the dampe offline software, including the major architecture design and specific implementation for simulation, calibration and reconstruction. The whole system has been successfully applied to dampe data analysis. Some results obtained using the system, from simulation and beam test experiments, are presented.

关键词： software architecture dampe abstract interface C++

Explaining dampe results by dark matter with hierarchical lepton-specific Yukawa interactions

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Chinese Physics C 2018年第3期42卷 87-93页

作者：柳国丽王飞王雯宇杨金民 School of Physics Zhengzhou University CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences College of Applied Science Beijing University of Technology School of Physics University of Chinese Academy of Sciences Department of Physics Tohoku University

We propose to interpret the dampe electron excess at 1.5 TeV through scalar or Dirac fermion dark matter （DM） annihilation with doubly charged scalar mediators that have lepton-specific Yukawa couplings. The hierarchy of such lepton-specific Yukawa couplings is generated through the Froggatt-Nielsen mechanism, so that the dark matter annihilation products can be dominantly electrons. Stringent constraints from LEP2 on intermediate vector boson production can be evaded in our scenarios. In the case of scalar DM, we discuss one scenario with DM annihilating directly to leptons and another scenario with DM annihilating to scalar mediators followed by their decays. We also discuss the Breit-Wigner resonant enhancement and the Sommerfeld enhancement in the case where the s-wave annihilation process is small or helicity-suppressed. With both types of enhancement, constraints on the parameters can be relaxed and new ways for model building can be opened in explaining the dampe results.

关键词： dampe dark matter Froggatt-Nielsen mechanism Sommerfeld enhancement

Energy correction based on fluorescence attenuation of dampe

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Research in Astronomy and Astrophysics 2020年第8期20卷 163-168页

作者： Li-Bo Wu Yun-Long Zhang Zhi-Yong Zhang Yi-Feng Wei Si-Cheng Wen Hao-Ting Dai Cheng-Ming Liu Xiao-Lian Wang Zi-Zong Xu Guang-Shun Huang State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China

The major scientific goals of the DArk Matter Particle Explorer(dampe)are to study cosmicray electrons(including positrons)and gamma rays from 5 GeV to 10 TeV and nuclei from Z=1 to 26 up to 100 *** deposited energy measured by the Bismuth Germanate Oxide(BGO)calorimeter of dampe is affected by fluorescence attenuation in BGO crystals that are 600 mm *** this work,an in-orbit attenuation calibration method is reported,and energy correction of the sensitive detector unit of the BGO calorimeter is also presented.

关键词： dampe BGO calorimeter fluorescence attenuation dark matter

Recent Progresses of the dampe Mission

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空间科学学报 2024年第4期44卷 633-642页

作者： CHANG Jin Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210033 School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026

The DArk Matter Particle Explorer(dampe)is a space high-energy particle andγ-ray detector whose major scientific goals are the indirect detection of dark matter particles,the origin of cosmic rays and highenergyγ-ray *** its successful launch in December 2015,the dampe has been operated smoothly in orbit for more than 8 *** direct measurements of the boron-to-carbon and boron-to-oxygen flux ratios,and the proton+Helium spectrum up to 316 TeV have been obtained,revealing new spectral features with very high *** search results ofγ-ray spectral line and fractionally charged particles indicate a good potential of dampe for indirect dark matter detection and new physical discovery in *** dampe measurements are expected to significantly advance our understanding of the fundamental problems in astroparticle physics.

关键词： dampe Dark matter Indirect detection Cosmic rays