Proceedings of 40th International Conference on High Energy physics

Supersymmetric theories and graphene 超对称理论与石墨烯

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-04-15 DOI: 10.22323/1.390.0662

A. Gallerati

引用次数: 11

Search for long range flow-like correlation in hadronic $e^{+}e^{-}$ collisions with Belle 在强子$e^{+}e^{-}$与Belle的碰撞中寻找长程流状关联

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-04-02 DOI: 10.22323/1.390.0541

Yu-Chen Chen, Chengjian Lin, Yen-Jie Lee, P. Chang

{"title":"Search for long range flow-like correlation in hadronic $e^{+}e^{-}$ collisions with Belle","authors":"Yu-Chen Chen, Chengjian Lin, Yen-Jie Lee, P. Chang","doi":"10.22323/1.390.0541","DOIUrl":"https://doi.org/10.22323/1.390.0541","url":null,"abstract":"The enhancement of charged-particle pairs with large pseudorapidity difference and small azimuthal angle difference, often referred to as the “ridge signal”, is a phenomenon widely observed in high multiplicity proton-proton, proton-ion and deutron-ion collisions, which is not yet fully understood. In heavy-ion collisions, the hydrodynamic expansion of the Quark-Gluon Plasma is the most popular explanation of the ridge signal. Measurements in the 4+4− collision system, without the complexities introduced by hadron structure in the initial state, can be a new opportunity to examine the formation of a ridge signal. The first measurement of two-particle angular correlation functions in high multiplicity 4+4− collisions at √ B = 10.52 GeV is reported. About 31.5 fb−1 hadronic 4+4− annihilation data collected by the Belle detector at KEKB are used in this study. Two-particle angular correlation functions are measured over the full azimuth and large pseudorapidity intervals which are defined by either the electron beam axis or the event thrust as a function of charged particle multiplicity. The measurement in the event thrust analysis, with mostly quark and anti-quark pairs determining the reference axis, is sensitive to soft gluon emissions associated with the outgoing (anti-)quarks. No significant ridge signal is observed with analyses performed in either coordinate system. Near-side jet correlations appear to be absent in the thrust axis analysis. The measurements are compared to predictions from various 4+4− event generators and expected to provide new constraints to the phenomenological models in the low collision energy regime.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81156232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Status and progress of the JUNO detector 朱诺探测器的现状和进展

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-04-01 DOI: 10.22323/1.390.0882

Jilei Xu

引用次数: 1

The status of the R&D of Ultra Fast 8 times 8 Readout MCP-PMTs in IHEP IHEP超快速8倍8读出MCP-PMTs的研究现状

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-04-01 DOI: 10.22323/1.390.0867

S. Qian, Lishuang Ma, Hao Guo, Guorui Huang, Q. Hu, Li Zhen, Shulin Liu, Z. Ning, S. Peng, Ren Ling, Detan Su, Su Jianning, Si Shuguang, Qi Wu, Wang Xingchao, Wang Ning, Wu Kai, Zhigang Wang, Zhile Wang, M. Yan, Yao Zhu, Lingfeng Zhang, Yinhong Zhang

引用次数: 3

Characterization of ALPIDE silicon sensors with inclined tracks 倾斜轨迹ALPIDE硅传感器的表征

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-03-11 DOI: 10.22323/1.390.0805

S. Kushpil

{"title":"Characterization of ALPIDE silicon sensors with inclined tracks","authors":"S. Kushpil","doi":"10.22323/1.390.0805","DOIUrl":"https://doi.org/10.22323/1.390.0805","url":null,"abstract":"The upgrade of the ALICE Inner Tracking System (ITS) aims at improving the capabilities of ALICE in terms of read-out rate as well as track pointing resolution and track finding efficiency, especially for particles with low transverse momenta. The new ITS will be a low material budget detector with high granularity and read-out speed. It comprises seven concentric layers of Monolithic Active Pixel Sensors (MAPS) with a total active surface of about 10 m2. The developed MAPS are based on the TowerJazz 180 nm CMOS technology. The sensor is called ALPIDE. In this paper we present the setup used for measurements with inclined tracks and we discuss the sensor efficiency obtained using π beams with a momentum of 6 GeV/c at the Proton Synchrotron (PS) at CERN. Some sensors were irradiated before the beam test using the cyclotron facility of the Nuclear Physics Institute of the Czech Academy of Sciences (NPI CAS) to induce radation damage to the sensor. Measurements at different operating points (thresholds, bias voltages) provide important information about cluster-shape frequencies, needed to tune the ALICE Monte-Carlo generators. Very good agreement between test-beam data and simulations is obtained.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77059851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The JUNO Calibration Strategy and Simulation JUNO标定策略与仿真

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-03-09 DOI: 10.22323/1.390.0817

Kangfu Zhu, Qingmin Zhang

引用次数: 0

Erratic server behavior detection using machine learning on basic monitoring metrics 在基本监控指标上使用机器学习进行不稳定服务器行为检测

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-03-09 DOI: 10.22323/1.390.0899

M. Adam, L. Magnoni, D. Adamová

引用次数: 0

Probing the prospective FCC-he sensitivities on the electromagnetic dipole moments of the top-quark 探讨顶夸克电磁偶极矩的未来fcc - e灵敏度

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-03-08 DOI: 10.22323/1.390.0353

M. A. Hernandez-ruiz, Muhammet Köksal, A. Billur, A. Gutiérrez-Rodríguez

引用次数: 0

Latest Results from the AMS Experiment on the International Space Station 国际空间站AMS实验的最新结果

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-03-06 DOI: 10.22323/1.390.0045

Z. Weng

{"title":"Latest Results from the AMS Experiment on the International Space Station","authors":"Z. Weng","doi":"10.22323/1.390.0045","DOIUrl":"https://doi.org/10.22323/1.390.0045","url":null,"abstract":"The Alpha Magnetic Spectrometer is a general-purpose particle physics detector operating on the International Space Station. Precision measurements by AMS of the cosmic-ray elementary particle fluxes and nuclei fluxes reveal new unexpected phenomena. The positron flux exhibits a significant excess starting from 25.2 ± 1.8GeV followed by a sharp drop-off above 284+91 −64 GeV, consistent with a primary source of cosmic-ray positrons from either dark matter collisions or new astrophysical sources. The different behavior of the cosmic-ray electron flux and positron flux shows that most high energy electrons originate from different sources than high energy positrons. Intriguingly, the positron flux and the antiproton flux have strikingly similar behavior at high energies. New observations from AMS on cosmic nuclei show that primary cosmic-ray He, C, and O have an identical rigidity dependence above 60 GV and deviate from a single powerlaw above 200 GV. Unexpectedly, the primary Ne, Mg, and Si also have an identical rigidity dependence above 86.5 GV, but they are different from that of He, C, and O. This shows that primary cosmic rays have at least two distinct classes of rigidity dependence. Above 30 GV, secondary cosmic nuclei Li, Be, and B have identical rigidity dependence which is distinctly different from those of primary cosmic rays. The results from AMS on many different types of cosmic rays are not explained by the current theoretical models and provide unique input to the understanding of the origins and evolution of cosmic rays in the galaxy.","PeriodicalId":20428,"journal":{"name":"Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91225831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Automated selection of particle-jet features for data analysis in High Energy Physics experiments 高能物理实验数据分析中粒子射流特征的自动选择

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020) Pub Date : 2021-03-05 DOI: 10.22323/1.390.0907

A. Luca, F. Follega, M. Cristoforetti, R. Iuppa

引用次数: 1

Proceedings of 40th International Conference on High Energy physics — PoS(ICHEP2020)最新文献