DOCSLIB.ORG

Status of BES-III Experiment

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Status of BES-III Experiment Status of BES-III Experiment Hai-Bo Li for BES-III Collaboration IHEP, Beijing HQkdLtHeavy Quarks and Leptons, 5 June-9 June 2008 School of Physics, The University of Melbourne Australia 2008－6－5Hai-Bo Li (李海波） 1 Outline ¾ BEPC-II/BES-III detectors ¾ Physics program at BESIII ¾ Summary 2008－6－5Hai-Bo Li (李海波） 2 Status of BEPC -II and BES -III 2008－6－5Hai-Bo Li (李海波） 3 BEPC II Storage ring: Large angle, double-ring RF SR RF Beam energy: 1.0-2.3 GeV Luminosity: 1×1033 cm-2s-1 Optimum beam energy: 1.89 GeV 0 . 1 Energy spread: c m 5.16 ×10-4 d 8ns ra No. of bunches: 1 2 m .5c 2 m 93 2.5m Bunch length: 1.5 cm Total current: 0.91 A SR mode: 0.25A @ 2.5 GeV 2008－6－5Hai-Bo Li (李海波） 4 IP Milestone of BEPCII storage ring commissioning Nov. 2006 Beam stored in the storage ring Dec. 2006 Start to provide SR beams for users Mar. 2007 First e+e− collision, Lumi ~ 1030 cm-2 s-1 June 2007 Provide SR beams for users at 2.5GeV, 200mAwithalifetimeof55hr200 mA with a lifetime of 5.5 hr Aug. 2007 Beam current reached 500 mA Sep. 2007 SCQ moved to the interaction region Jan. 2008 BEPCII: collision with 500mA×500mA and 93 bunches in each ring，the luminosity is about 1110*1032cm-2s-1 June 20 2008 First physics collision 2008－6－5Hai-Bo Li (李海波） 5 Charm productions per year at BEPCII Average Lum: L = 0.5×Peak Lum.; One year data taking time: T = 107s σ × × Nevent/year = exp L T Resonance Mass(GeV) Peak Lum. Physics Cross #Nevents/year CMS (1033cm-2s-1) Section (b)(nb) J/ψ 3.097 0.6 3400 10 × 109 τ+τ− 3.670 1.0 2.4 12 × 106 ψ(2S) 3.686 1.0 640 3.2 × 109 D0D0bar 3.770 1.0 3.6 18 × 106 D+D- 3. 770 101.0 282.8 14 × 106 DsDs 4.030 0.6 0.32 1.0 × 106 DsDs 4.170 0.6 1.0 2.0 × 106 2008－6－5Hai-Bo Li (李海波） 6 BES-III Magnet: 1 T Super conducting current 3400 Amp MDC: small cell & Gas: He/C3H8 (60/40) σ =130 μm σxy p/p = 0.5% @1GeV dE/dx=6% TOF: σ T = 100 ps Barrel 110 ps Endcap Muon ID: 9 layers RPC 8 layypers for endcap EMC: CsI crystal Data Acquisition: ΔE/E = 2.5% @1 GeV Event rate = 4 kHz σz = 0.6 cm/√E Total data volume ~ 50 MB/s The detector is hermetic for neutral and charged particle with excellent resolution , PID, and large coverage. 2008－6－5Hai-Bo Li (李海波） 7 2008－6－5Hai-Bo Li (李海波） 8 BESIII Status 9 Finish the installation of all the detector components . Beam pipe, MDC, Barrel and endcap TOF, barrel and endcap EMC, all muon chambers. 9 Cosmic ray data from Dec. 2007 to March 15 2008, with DAQ, Trigger, and Slow control, fixing problems. 9 BESIII de deecotector into obe beam-line o n Ma y 6, 2 008 9 Starting another cosmic run on May 28, 2008 9 Physics run on July 20, 2008 9 Luminosity of BEPCII is expected to reach ~ 3 x 1032cm-2s-1 in the end of 2008. [The design Lum is 1 x 1033cm-2s-1] 9 Software and physics preparation in good shape. 2008－6－5Hai-Bo Li (李海波） 9 Totally 37 institutions now Europe (5) USA (7) GSI, Germany University of Hawaii University of Bochum, Germany University of Washington University of Giessen, Germany Carnegie Mellon University Univ. of Florida JINR, Dubna, Russia Univ. of Minnesota Rensselaer Polytechnic Institute BdkiBudker ins titttitute o fNf Nuc lear PhiPhysics Japan (1) University of Rochester Russia China (24) Tokyo University IHEP, CCAST, GUCAS， Univ. of Sci. and Tech. of China Shandong Univ., Zhejiang Univ. Huazhong Normal Univ., Wuhan Univ. “Spectators”: Zhengzhou Univ., Henan Normal Univ. Peking Univ., Tsinghua Univ. , four institutes Zhongshan Univ.,Nankai Univ. Shanxi Univ., Sichuan Univ from Italy Hunan Univ., Liaoning Univ. Nanjing Univ., Nanjing Normal Univ. Guangxi Normal Univ., Guangxi Univ. HKUiitHong Kong University Chinese Univ. of Hong Kong 2008－6－5Hai-Bo Li (李海波） 10 Hot ppyhysics top ics at BES-III 2008－6－5Hai-Bo Li (李海波） 11 Hot topics at BES-III ¾ Light hadron spectroscopy: meson, baryon, hybrid, glueball and other exotics in J/ψ and ψ(2S) decays. η η ψ ψ χ ¾ Charmonium states: c((),1S), c((),2S), J/ , ((),2S), c, hc , ψ(3770), new ccbar states above 4.0 GeV ¾ Energy scan: R values, new resonances … ¾ Tau physics: precision tau mass ¾ Charm physics: D, Ds mesons Leptonic Charm Decays D→l+ν SilidSemileptonic decay rates &f& form-factors Charm Dalitz Decays, …… Charm Mixing. CP Violation and Rare charm decays … ¾ Rare charmonium decays: LFV, invisible decays , …… many more unexpected itiinnovations 2008－6－5Hai-Bo Li (李海波） 12 Light hadron spectroscopy With 1010 J/ψ events with the state of art detector , we expect to learn more on: • Baryon spectroscopy • Glueballs • Non-qqbar states 2008－6－5Hai-BoSpectrum of glueballs fromLi (李海波） LQCD 13 0++ resonances at BESIII σ κ , , f0(980), f0(1370), f0(1500) and f0(1710) are well established in PDG. B.S.Zou arXiv 0804.2756 J/ψ radiative decays J/ψ hadronic decays χ c02 hadronic decays 2008－6－5Hai-Bo Li (李海波） 14 States with Exotic quantum number Hybrid mesons and glueballs are always mixing with normal mesons with the same quantum numbers. It is hard to us to separate them from normal mesons . However: Quantum numbers offf ferm ion-antiferm ion EtiExotic 1−+ : quantum numbers 2s+1L JPC Meson J π η 1S (s-wave0-+ ) a 0 π JPC 0 πη π 3S (p-wave)1-- 1 ρ 0+- 1 πη 1 (d-wave)+- a2 -- P1 1 b1 0 3P 0++ a 1-+ 0 πρ (p-wave) π1 0 3 ++ +- P1 πf (s-wave)1 π a1 2 3 1 ++ 1 -+ P2 π 2 π a2 3 b1 (s-wave) 1 2008－6－5Hai-Bo Li (李海波） 15 Example + − + − X(1835) at BESIII via J /ψ → γη'π π ,η'→ηπ π 58M J/ψ data Phys.Rev.Lett.95:262001,2005 at BESIII at BESII 3×109 J/psi events (50 times of BESII) 2 years’ data taking 5.0σ >10σ η ππ 2 M( ’ ) GeV/c 2 2008－6－5Hai-Bo Li (李海波） M(η’ππ) GeV/c16 Charmonium states below open charm What can we do with 3 billion ψ(2S)? χ sample Ψ(2S) Æ π+π−J/ψ (31%) c,0,1,2 useful to understand really “pure” J/ψ sample 1977 thdhe decay dynam ics o f cc bar a complementary of and light hadrons J/ψ peak data! 1974 Q. Zhao, hep-ph/0508086 2002 η ′ ψ γ π 2004 1975 c in (2S) Æ KSK ψ γπ+π−η (2S) Æ C with untagged gamma M. Voloshin hep-ph/0206240 “ρπ”l” puzzle η π+π−η B( C(2S) Æ C ) = 5-10% Kuang et al. J. Rosner PRD 64 (094002) 2001 Detail study of hC at BESIII P. Wang et al PRD70(114014)2004 Non-DD decay o f ψ(3770): 1980 N. Achasov hep-ph/0505146 η ψ ψ) γη The productions of D0D0, D+D− C(1S) sample from (2S) (J/ Æ C(1S) 1974 used to study the light spectrum M. Voloshin hep-ph/0402171 2008－6－5Hai-Bo Li (李海波） 17 Scan will be crucial at BES-BES-III:III: ECM = 37733773--46004600 MeV Opportunity at BESIII to look for new states above the op en charm region. ) * CLEO-c Preliminary Ron Poling talk at Charm2006 CLEO-c PRL 96, 162003 (2006) 2008－6－5Hai-Bo Li (李海波） 18 Rare and forbidden quarkonium decays No any evidence beyond SM is found on the accelerators. No any indication beyond SM in Quarkonium decays. Rare and forbidden Charmonium decays : (1) Lepton Flavor/baryon number violating decays; (2) Invisible decays . 2008－6－5Hai-Bo Li (李海波） 19 Lepton flavor violating processes in J/ψ decays Lepton flavor violating (LFV) processes are strongly suppressed in the Standard Model by power of (small) neutrino masses. Such decays signal new physics. PRD63, 016003, S. Nussinov, R.D. Peccei and X.M. Zhang ψ → μτ τ → ν ν ψ → τ τ → μν ν J / , e e τ J / e , μ τ BESII upper limit BR(J/ψ Æ eμ)<11) < 1.1×10−6 BR(J/ψ Æ eτ) < 8.3×10−6 BR(J/ψ Æ μτ) < 2.0×10−6 with 58M J/ ψ sample BESII PLB561,,( 49 (2003) μ momentum distribution PLB598, 172(2004) J/ψ Æ eμ, eτ, τμ, the sensitivity can be 10−8 –10−9 at BES-III with 1010 J/ψ events per year J/ψ Æ e− pp,roton +c.c, J/ψ Æ μ− proton +c.c can also be searched for. 2008－6－5Hai-Bo Li (李海波） 20 Invisible quarkonium decays WithiWith in SMthiSM, the inv iiblisible quar kon ium decays are pre ditdbdicted by: hep-ph/9806487, L.N Chang, O.Lebedlev and J. N. Ng With 2-3% uncertainty! One get: Br(Y(1S) Æνν) = 1.0×10−5 Theoretical clean process can be used to test model Br(J/ψ Æ νν) = 2.69 ×10−8 and probe new physics! New physics may enhance the production rate of the invisible dfkiFlMVdkttdidtdecays of quarkonia. For example, MeV dark matter candidates.
Load more

Recommended publications
  • Design and Construction of the BESIII Detector
    Design and Construction of the BESIII Detector M. Ablikim, Z.H. An, J.Z. Bai, Niklaus Berger, J.M. Bian, X. Cai, G.F. Cao, X.X. Cao, J.F. Chang, C. Chen, G. Chen, H.C. Chen, H.X. Chen, J. Chen, J.C. Chen, L.P. Chen, P. Chen. X.H. Chen, Y.B. Chen, M.L. Chen, Y.P. Chu,X.Z. Cui, H.L. Dai, Z.Y. Deng, M.Y. Dong, S.X. Du, Z.Z. Du, J. Fang, C.D. Fu, C.S. Gao, M.Y. Gong, W.X. Gong, S.D. Gu, B.J. Guan, J. Guan, Y.N. Guo, J.F. Han, K.L. He, M. He, X. He, Y.K. Heng, Z.L. Hou, H.M. Hu, T. Hu, B. Huang, J. Huang, S.K. Huang, Y.P. Huang, Q. Ji, X.B. Ji, X.L. Ji, L.K. Jia, L.L. Jiang, X.S. Jiang, D.P. Jin, S. Jin, Y. Jin, Y.F. Lai, G.K. Lei, F. Li, G. Li, H.B. Li, H.S. Li, J. Li, J. Li, J.C. Li, J.Q. Li, L. Li, L. Li, R.B. Li, R.Y. Li, W.D. Li, W.G. Li, X.N. Li, X.P. Li, X.R. Li, Y.R. Li, W. Li, D.X. Lin, B.J. Liu, C.X. Li u, F. Li u, G.M. Li u, H. Li u, H.M. Li u, H.W. Li u, J.B. Li u, L.F. Li u, Q. Li u, Q.G. Li u, S.D.
    [Show full text]
  • Prospect of Particle Physics in China
    Outline Prospect of Particle Physics in China • Introduction • BEPC and its results • BEPCII • Non-Accelerator Physics Experiments Hesheng Chen • Medium and long term plan of particle physics in China. Institute of High Energy Physics Beijing 100049, China 2 1 Particle Physics in China Prof. Sanqiang Qian, • Chinese Nuclear physics and Particle physics researches the founder of Chinese have long tradition: – Zhongyao Zhao : discovery of Positron Nuclear Physics and – Ganchang Wang: neutrino search Particle Physics, was a – Sanqiang Qian and Zehui He: students of Curie student of Mr and – …… • Institute of Modern Physics established 1950. Madam Curie . He was • JINR Dubna: the director of the Inst. – Jointed 1956 of Modern Physics – Discovery of anti-Σ by the group led by Ganchang since March 1951. Wang – Withdraw 1965 • Chinese Government deided to use the money to build the Prof. Sanqiang Qian Chinese HEP center 4 2 Particle Physics in China Institute of High Energy Physics • Independent Institute for High Energy Physics: Feb. 1973 • OfOpen door after cultural revolut ion: sent phys iiicists to Comprehensive and largest fundamental research Mark-J @ DESY 1978 center in China • HE physicists worked at DESY,CERN and US Major research fields : • China –US HEP agreement – Particle physics: Charm physics @ BEPC, LHC exp., • Beijing Electron Positron Collider (BEPC): milestone . ν constructed 1984-1988 cosmic ray, particle astrophysics, physics … • Provide big scientific platforms: – Accelerator technology and applications – Synchrotron Radiation Light Sources: – Synchrotron radiation technologies and applications • Beijing synchrotron radiation facility (2.5GeV) 1030 emppyloyees, ~ 670 p pyhysicists and eng ineers, • Hefei national synchrotron radiation light source (800MeV) 400 PhD Students and postdoctors • Shanghai Light source(3.5GeV, underconstruction) – Chinese Spallation Neutron Source 3 Particle physics experiment group Particle Physics Experiments in China • Univ.
    [Show full text]
  • Doubly Charmed Tetraquarks in a Diquark-Antidiquark Model
    Doubly charmed tetraquarks in a diquark-antidiquark model Xiaojun Yan, Bin Zhong and Ruilin Zhu ∗ Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, Jiangsu 210023, China We study the spectra of the doubly charmed tetraquark states in a diquark-antidiquark model. The doubly charmed tetraquark states form an antitriplet and a sextet configurations according to flavor SU(3) symmetry. For the tetraquark state [qq0][¯cc¯], we show the mass for both bound and excited states. The two-body decays of tetraquark states T cc[0+] and T cc[1−−] to charmed mesons have also been studied. In the end,the doubly charmed tetraquarks decays to a charmed baryon and a light baryon have been studied in the SU(3) flavor symmetry. Keywords: Exotic states, tetraquark, diquark I. INTRODUCTION may give an interpretation to such XYZ states [44]. A tetraquark state can also be represented with four quark configuration [qq0][¯cc¯](two charm antiquarksc ¯'s and two Since last decade, Belle, BABAR, BESIII, LHCb and light quarks with up, down and strange quarks u, d and other experimental data have indicated a considerable s), which is called as doubly charmed (C=2) tetraquark number of exotic hadronic resonances with charm or T cc. From a theoretical point of view, T cc may be a more beauty, the so-called XYZ and Pc particles including interesting hadronic state because the two heavy charm tetraquark states and pentaquark states [1{17]. All of quark are more likely to form a lower energy diquark these exotic states have many unexpected properties, and two light quarks will rotate round the charmed di- such as masses, decay widths and cross-sections, which quark.
    [Show full text]
  • Perspectives in Hadron Physics ICISE, Quy Nhon, Vietnam September 22-28, 2019 Booklet of Abstracts
    15th Rencontres du Vietnam Perspectives in Hadron Physics ICISE, Quy Nhon, Vietnam September 22-28, 2019 Booklet of abstracts Version of September 13, 2019 1 1 Kaonic hydrogen and deuterium from SIDDHARTA Claude AMSLER Stefan Meyer Institute for Subatomic Physics, Vienna [email protected] Data on the KN interaction very close to threshold (e.g., from kaonic atoms) pro- vides information on the interplay between spontaneous and explicit chiral symmetry breaking in low energy QCD. Kaonic hydrogen was investigated with unprecedented precision by the SIDDHARTA experiment at the DAφNE electron-positron collider of LNF (Frascati), which delivers very low energy charged kaons from the decay of the φ resonance. The strong interaction shift and broadening of the ground state were mea- − sured, from which the s-wave K p scattering length a = 1=2(a0+a1) was derived, where a0 (a1) are the two isoscalar (isovector) components. To determine the two contributions separately, measurements of the shift and width of the 1s kaonic deuterium atom are re- quired. This is one of the most important missing information on the low-energy KN interaction. The approved experiment SIDDHARTA-2 at LNF intends to measure the transition X-rays to the ground state of kaonic deuterium. Challenging are the very small X-ray yields, the even larger widths compared to hydrogen, and the high radiation environ- ment. Data are not available so far (apart from an exploratory experiment performed at DAφNE in 2013). We are developing large area X-ray detectors by optimizing the signal-over-noise ratio, improving on the timing capability and implementing charge particle tracking and veto devices.
    [Show full text]
  • Author: Halimeh Vaheid Supervisor: Karin Schönning Subject Reader
    + ¯ 0 ¯ 0 0 Monte Carlo Simulation of e e− Σ Λ=Σ Σ Reaction ! Uppsla University Department Of Physics and Astronomy Master Thesis Author: Halimeh Vaheid Supervisor: Karin Sch¨onning Subject reader: Magnus Wolke i Contents 1 Introduction 2 1.1 Aim .............................................2 1.2 The Standard Model . .3 1.3 The Strong Interaction . .3 1.4 Hadrons . .4 1.4.1 Quantum Numbers . .4 1.4.2 Mesons . .7 1.5 Baryons . .8 1.5.1 Hyperon . .9 2 Formalism 10 2.1 Cross section . 10 2.2 Relativistic Kinematics . 11 2.2.1 Electromagnetic Form Factor . 13 3 Hyperon Production in e+e− Annihilation 16 3.1 The e+e− ΛΣ¯ 0 reaction . 16 ! 3.2 The e+e− Σ0Σ¯ 0 reaction . 18 ! 3.3 Previous studies . 19 4 The BESIII Experiment 20 4.1 BEPC-II . 20 4.1.1 The BES III Detector . 21 5 Software Tools 26 5.1 Jupyter . 26 5.2 BOSS . 27 ii 5.2.1 Event generation . 27 5.2.2 Particle transport and detector response . 28 5.2.3 Digitalization . 28 5.2.4 Reconstruction . 28 5.2.5 Analysis . 28 6 Parameter Estimation Using Monte Carlo method 29 6.1 The Method of Moments . 29 6.1.1 Extracting the ratio R from an angular distribution by applying MM . 30 6.2 The Least Squares Fit . 32 6.3 Hit-or-Miss Generator . 32 6.4 Simulating angular distributions . 33 6.4.1 The Results . 33 6.5 Results and Discussion . 35 7 Full Simulation Study with BES III 36 7.1 The pre-selection criteria .
    [Show full text]
  • A Cylindrical GEM Detector for BES III
    University of Ferrara Physics and Earth Sciences Department Master’s Degree in Physics A cylindrical GEM detector for BES III Supervisor: Dott. Diego Bettoni Additional Supervisor: Dott. Gianluigi Cibinetto Examiner: Dott. Massimiliano Fiorini Candidate Riccardo Farinelli arXiv:1808.01929v1 [physics.ins-det] 6 Aug 2018 Academic year 2013-2014 ii Contents Contents 1 The BESIII experiment 3 1.1 The Physics program . 3 1.1.1 Charmonium spectroscopy . 4 1.1.2 Light-quark spectroscopy . 5 1.1.3 D physics . 6 1.1.4 τ physics . 6 1.2 BEPC II . 7 1.3 The BES III detector . 9 1.3.1 The Multilayer Drift Chamber . 10 1.3.2 Time-of-flight (TOF) . 13 1.3.3 Electro-Magnetic Calorimeter . 14 1.3.4 Superconducting Solenoid Magnet . 14 1.3.5 Muon Chamber . 15 1.3.6 MDC ageing issues . 15 2 Cylindrical GEM based Inner Tracker 19 2.1 Requirements . 20 2.2 State of art . 21 2.3 BESIII innovations . 24 2.3.1 Rohacell . 24 2.3.2 Anode design . 26 2.3.3 Analog readout . 28 2.4 Mechanical design . 28 2.4.1 Detector elements . 28 2.4.2 Assembly technique . 30 2.5 Cathode’s structure construction at Ferrara . 30 2.6 Front-end electronics . 32 iv Contents 3 Background studies 35 3.1 BESIII Offline Software . 35 3.2 Present and expected backgrounds . 36 4 CGEM Monte Carlo simulations 41 4.1 Garfield modeling of the detector . 41 4.2 Gas properties calculation . 42 4.3 Triplegem simulations with Garfield++ . 45 4.3.1 Ansys cell .
    [Show full text]
  • Sandbox Studio
    Illustrations: Sandbox Studio Illustrations: Sandbox Studio 14 Chasing charm inCHINA symmetry | volume 06 | issue 02 may 09 American scientists are flocking to the Beijing Electron Positron Collider, whose recent upgrades make it the premier place to study charm quarks and their kin. By Kelen Tuttle 15 The flight plan of today’s particle physicist can be “This was a good deal for all,” says University of a dizzying thing. Like migratory creatures, research- Minnesota Professor Ron Poling, whose group ers circle the globe in search of the best data, was one of the first in this new wave of American working on one experiment for several years and collaborators. “Beijing had an upgraded acceler- then moving on to the next, all in the hope of ator and a new detector, and we had physics answering fundamental questions about the way we wanted to do on just such a machine—but the world works. nowhere to do it. We couldn’t have made this One of particle physics’ most recent migrations transition more seamless if we had planned it from involves researchers from the United States. For the beginning.” several years, scientists with Cornell University’s CLEO-c experiment in New York studied charm Cranking out the charm quarks produced in collisions of electrons with About 200 miles northwest of the buzz of New positrons. Yet just as they began to find intriguing York City, the CLEO-c detector operated at a hints of the unexpected, CLEO-c reached the low hum from 2005 to 2008. The machine’s energy end of its allotted funding and shut down.
    [Show full text]
  • Simulation and Reconstruction of the BESIII EMC
    XIV International Conference on Calorimetry in High Energy Physics (CALOR 2010) IOP Publishing Journal of Physics: Conference Series 293 (2011) 012025 doi:10.1088/1742-6596/293/1/012025 Simulation and reconstruction of the BESIII EMC Miao He Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China E-mail: [email protected] Abstract. The simulation and reconstruction software of the BES III Electromagnetic Calorimeter (EMC), are developed based on the object-oriented language C++, in the framework of Gaudi[1]. Performance of EMC are studied with data and compared with Monte Carlo samples. 1. Introduction The Beijing Spectrometer (BES) III [2][3] is a multi-purpose detector operated at the Beijing electron-positron collider (BEPC) II for physics at tau-charm energy region. The BES III detector consists of four sub-detectors: the Drift Chamber (DC), Time-Of-Fight counters(TOF), the Electromagnetic Calorimeter (EMC), and Muon Counters(MUC). EMC is used to measure energies and positions of electrons and photons with high detection efficiency and good resolutions. The simulation software of EMC shall implement detector simulation and digitization, and reconstruction software shall process the raw data, correct all possible bias and reconstruct the energy and position of incident particle. This paper introduces the design and the implementation of the EMC simulation and reconstruction software package, developed in the framework of BES III Offline Software System(BOSS)[4]. The configuration of the EMC is described firstly, followed by the discussion of basic simulation and reconstruction algorithms. The performance of EMC and comparison between data and simulation is shown at the end.
    [Show full text]
  • Development of a CMOS Pixel Based Inner Tracker for the BES-III Experiment at BEPC-II Qingyuan Liu
    Development of a CMOS pixel based inner tracker for the BES-III experiment at BEPC-II Qingyuan Liu To cite this version: Qingyuan Liu. Development of a CMOS pixel based inner tracker for the BES-III experiment at BEPC-II. Instrumentation and Detectors [physics.ins-det]. Université de Strasbourg, 2017. English. NNT : 2017STRAE021. tel-01725127 HAL Id: tel-01725127 https://tel.archives-ouvertes.fr/tel-01725127 Submitted on 7 Mar 2018 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. UNIVERSITÈ DE STRASBOURG ÈCOLE DOCTORALE DE PHYSIQUE ET CHIMIE-PHYSIQUE Institut Pluridisciplinaire Hubert CURIEN (IPHC) THÈSE présentée par: Qingyuan LIU soutenue le: 19 Septembre 2017 pour obtenir le grade de: Docteur de l’Université de Strasbourg Discipline/Spécialité : Physique des particules èlèmentaires Development of a CMOS Pixel Based Inner Tracker For the BES-III Experiment at BEPC-II Directeur de thèse: Marc WINTER Directeur de recherche, IPHC-UMR 7178, Strasbourg Meng WANG Professeur, Shandong University, China Rapporteur externe: Eric KAJFASZ Directeur de recherche, CPPM-UMR 7346, Marseille Imad LAKTINEH Professeur, IPNL-UMR 5822, Lyon Examinateur: Sandrine COURTIN Professeur, IPHC-UMR 7178, Strasbourg Acknowledgements This thesis would not have been possible without the inspiration and support of many people.
    [Show full text]
  • Pos(ICHEP2020)498 Λ ∗ 0, [email protected] Speaker ∗ Dept
    Polarised and entangled hyperon-antihyperon pairs in BESIII PoS(ICHEP2020)498 Karin Schönning for the BESIII collaboration0,∗ 0Dept. of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden E-mail: [email protected] Polarised and entangled hyperons provide a powerful diagnostic tool to study non-perturbative QCD and to search for physics beyond the Standard Model at the precision frontier. The BESIII experiment in China offer unique possibilities to study strange hyperon-antihyperon final states under particle-antiparticle-symmetric conditions. Recent results include the first complete mea- surement of the time-like structure of any baryon, as well as a precise CP symmetry test for the Λ hyperon. Both analyses exploit the self-analysing weak decay of hyperons, giving access to spin polarization and entanglement of the hyperon-antihyperon pair. Using a similar approach, new information of production and decay of a number of single- and multi-strange as well as charmed hyperons. These proceedings present a summary of the most recent findings and give a glimpse of ongoing studies where new results are expected in the near future. 40th International Conference on High Energy physics - ICHEP2020 July 28 - August 6, 2020 Prague, Czech Republic (virtual meeting) ∗Speaker © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). https://pos.sissa.it/ Polarised and entangled hyperon-antihyperon pairs in BESIII Karin Schönning for the BESIII collaboration 1. Introduction The Standard Model of particle physics has proven immensely successful in describing the funda- mental particles and their short-range interactions.
    [Show full text]
  • Tetraquarks, Pentaquarks and Dibaryons
    IL NUOVO CIMENTO 39 C (2016) 319 DOI 10.1393/ncc/i2016-16319-5 Colloquia: La Thuile 2016 Tetraquarks, pentaquarks and dibaryons L. Maiani(1),(2) (1) INFN, Sezione di Roma - Roma, Italy (2) Dipartimento di Fisica, Universit`a di Roma La Sapienza - Roma, Italy received 26 July 2016 Summary. — The discovery of two pentaquarks by LHCb has reinforced the case of exotic hadrons, which have diquarks and antidiquarks as basic units. I review i) the cases studied until know, the so-called XYZ and pentaquark states, ii) the theoretical basis for this concept and iii) the implications for the existence of further states, in particular with baryon number equal to two (dibaryons). DedicatedtoGuidoAltarelli,afriendforalifetime. We shared the privilege to see the unfolding of the Standard Theory. 1. – Introduction For long, we lived with the simplest paradigm [1] (1) mesons = (qq¯); baryons = (qqq). This paradigm rested on the absence of I =2,ππ resonances and of S>0 baryons. The case had to be revisited because the lowest-lying octet of scalar mesons f0(980), a0(980), κ(800) and σ(600) does not fit in the picture. Later, in 2003, the X(3872), a narrow width resonance, which decays into J/Ψ+2π/3π, was discovered by Belle [2] and it was recognised that it does not fit into the charmonium sequence of states. Since then, BaBar [3], CDF [4], D0 [5], CMS [6] and LHCb [7] have confirmed the X(3872) and reported many other states that do not fit the charmonium picture, called X(J PC =1++)andY (J PC =1−−) states.
    [Show full text]
  • XYZ in the Future at BESIII
    BES III future prospects in exotic hadron spectroscopy Kai ZHU (IHEP) on behalf of BESIII 6th International conference on New Frontiers in Physics (ICNFP 2017) Workshop on exotic hadrons 17-29 August 2017, Kolymbari, Crete, Greece BEPCII: Beijing Electron-Positron Collider II 北京 电子 - 正电子 对撞机 II CMS energy：ퟐ. ퟎ ∼ ퟒ. ퟔ GeV； Luminosity: ퟏ × ퟏퟎퟑퟑ풄풎−ퟐ풔−ퟏ MESON 2010 Kai Zhu 2 BESIII: BEijing Spectrometer III 北京 谱仪 III Physics: light hadron, charmonium, charm, R-value & QCD, new physics 2017-4-19 XYZ at BESIII 3 “Normal” hadrons • Exotic candidates figures from arXiv:1403.1254, S. Olsen 2017-4-19 XYZ at BESIII 4 “Normal” hadrons • Exotic candidates figures from arXiv:1403.1254, S. Olsen 2017-4-19 XYZ at BESIII 5 2017-8-17 XYZ states at BESIII 6 2017-8-17 XYZ states at BESIII 7 2017-8-17 XYZ states at BESIII 8 2017-8-17 XYZ states at BESIII 9 2017-8-17 XYZ states at BESIII 10 2017-8-17 XYZ states at BESIII 11 2017-8-17 XYZ states at BESIII 12 2017-8-17 XYZ states at BESIII 13 2017-8-17 XYZ states at BESIII 14 2017-8-17 XYZ states at BESIII 15 2017-8-17 XYZ states at BESIII 16 2017-8-17 XYZ states at BESIII 17 2017-8-17 XYZ states at BESIII 18 2017-8-17 XYZ states at BESIII 19 2017-8-17 XYZ states at BESIII 20 2017-8-17 XYZ states at BESIII 21 2017-8-17 XYZ states at BESIII 22 2017-8-17 XYZ states at BESIII 23 2017-8-17 XYZ states at BESIII 24 2017-8-17 XYZ states at BESIII 25 2017-8-17 XYZ states at BESIII 26 2017-8-17 XYZ states at BESIII 27 2017-8-17 XYZ states at BESIII 28 2017-8-17 XYZ states at BESIII 29 2017-8-17 XYZ states at BESIII 30
    [Show full text]