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SUSY searches at ATLAS

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Frontiers of physics 2013年第3期8卷 248-256页

作者： pascal pralavoriot CppM University Aix-Marseille and CNRS/IN2P3 Marseille France

Despite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. The ATLAS experiment at the LHC searches for signs of supersymmetry in a large variety of signatures involving events with abnormal production of missing transverse momentum, jets, leptons, third generation fermions, gauge bosons or massive long-lived particles. A summary of the most recent results obtained in these searches is presented.

关键词： supersymmetry (SUSY) ATLAS LHC

propagation of a beam halo in accelerator test facility 2 at KEK

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Chinese physics C 2013年第5期37卷 81-84页

作者：白莎 p. Bambade 高杰 Institute of High Energy physics (IHEp) LAL Univ Paris-SudCNRS/IN2P3

The beam halo is a major issue for interaction region （IR） backgrounds at many colliders, for example, future linear colliders, B factories, and also it is an important problem at ATF2. In this paper, we report on the halo propagation along the ATF2 beam line with realistic apertures, the nonlinear optics influence on the increasing number of halo particles input is analyzed, and the transmitted halo particles distribution just before the last BpM is then described, the results from which will benefit the Compton recoil electrons measurement.

关键词： ATF2 beam halo Compton scattering Shintake monitor

Time-like proton form factor measurement with ANDA

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Chinese physics C 2009年第12期33卷 1244-1248页

作者： M. Sudol Institut de physique Nuclaire CNRS/IN2P3 Universit Paris Sud Orsay France

The electromagnetic probe is an excellent tool to investigate the structure of the nucleon. The nearly 4π detector pANDA, will allow to make a precise determination of the electromagnetic form factors of the proton in the time-like region with unprecedented precision. In the one-photon exchange approximation, the center of mass unpolarized differential cross section of the reaction pp → e＋e- is a linear combination of the squared moduli of the electric GE and magnetic GM proton form factors. The precise measurement of the angular distribution over almost full angular range then directly gives these quantities. At present only two experiments have provided the ratio R=｜ GE｜/｜GM｜ but with large statistical uncertainties. It is shown that with strict pID cuts and a kinematic fit, the dominant background, pp→π＋π-, can be supressed to much less than 1% of the signal, without affecting the extraction of the ratio R. pANDA will therefore offer a unique opportunity to measure the ratio with a precision ranging from 〈1% at low q2 up to 30 % for q2 = 14 （GeV/c）2.

关键词： electromagnetic form factors nuclear structure FAIR pANDA

New results on the hadronic vacuum polarization contribution to the muon g-2

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Chinese physics C 2010年第6期34卷 718-727页

作者： Michel Davier Laboratoire de l'Acclrateur Linaire IN2P3/CNRSUniversit Paris-Sud 11

Results on the lowest-order hadronic vacuum polarization contribution to the muon magnetic anomaly are presented. They are based on the latest published experimental data used as input to the dispersion integral. Thus recent results on τ→υτππ^0 decays from Belle and on e^＋e^- annihilation to π^＋π^- from BABAR and KLOE are included. The new data, together with improved isospin-breaking corrections for τ decays, result into a much better consistency among the different results. A discrepancy between the Standard Model prediction and the direct g- 2 measurement is found at the level of 3σ.

关键词： muon magnetic moment vacuum polarization electron-positron annihilation tau decays g-2

Gauge-invariant approach to quark dynamics

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Frontiers of physics 2016年第1期11卷 93-103页

作者： H. Sazdjian Institut de physique Nucldaire CNRS-IN2P3Universitd Paris-Sud Universitd Paris-Saclay 91406 Orsay Cedex France

The main aspects of a gauge-invariant approach to the description of quark dynamics in the nonperturbative regime of quantum chromodynamics （QC, D） are first reviewed. The role of the parallel transport operation in constructing gauge-invariant Green＇s functions is then presented, and the relevance of Wilson loops for the representation of the interaction is emphmsized. Recent developments, based on the use of polygonal lines for the parallel transport operation, are presented. An integro-differential equation, obtained for the *** Green＇s function defined with a phase factor along a single, straight line segment, is solved exactly and analytically in the case of two-dimensional QCD in the large-Nc, limit. The solution displays the dynamical mass generation phenomenon for quarks, with an infinite number of branch-cut singularities that are stronger than simple poles.

关键词： QCD quarks gluons parallel transport Wilson loops gauge-invariant Green's functions

In situ cosmogenic ^(10)Be dating of the Quaternary glaciations in the southern Shaluli Mountain on the Southeastern Tibetan plateau

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Science China Earth Sciences 2006年第12期49卷 1291-1298页

作者： Raisbeck Grand Yiou Francios Centre de Spectrometric Nucleaire et de Specmetric de Masse IN2P3 CNRS Bat.10891405 Campus Orsay France

It is generally considered that four-times ice age happened during the Quaternary epoch on the Tibetan plateau. However, the research on the chronology of the four-times ice age is far from enough. The Shaluli Mountain on the Southeastern Tibetan plateau is an ideal place for plaeo-glacier study, because there are abundant Quaternary glacial remains there. This paper discusses the ages of the Quaternary glaciations, based on the exposure dating of roche moutonnée, moraines and gla- cial erosion surfaces using in situ cosmogenic isotopes 10Be. It is found that the exposure age of the roche moutonnée at Tuershan is 15 ka, corresponding to Stage 2 of the deep-sea oxygen isotope, suggesting that the roche moutonnée at Tuershan is formed in the last glacial maximum. The expo- sure age of glacial erosion surface at Laolinkou is 130―160 ka, corresponding to Stage 6 of the deep-sea oxygen isotope. The oldest end moraine at Kuzhaori may form at 421―766 kaBp, corre- sponding to Stages 12―18 of the deep-sea oxygen isotope. In accordance with the climate charac- teristic of stages 12,14,16 and 18 reflected by the deep-sea oxygen isotope, polar ice cores and loess sequence, the oldest end moraine at Kuzhaori may form at stage 12 or stage 16, the latter is more possible.

关键词： Quaternary,glaciation,glacial,cosmogenic isotope,dating,10Be,exposure dating,Tibetan plateau,environmental change,surface dating,boulder,erosion.

Analytical estimation of ATF beam halo distribution

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Chinese physics C 2014年第12期38卷 64-69页

作者：王逗 philip Bambade Kaoru Yokoya 高杰 Institute of High Energy physics Chinese Academy of Sciences LAL Univ Paris-Sud CNRS/IN2P3 Orsay France KEK Tsukuba Ibaraki Japan

In order to study the backgrounds in the ATF2 beam line and the interaction point（Ip）, this paper has developed an analytical method to give an estimation of the ATF beam halo distribution based on K. Hirata and K. Yokoya＇s theory. The equilibrium particle distribution of the beam tail in the ATF damping ring is presented,with each electron affected by several stochastic processes such as beam-gas scattering, beam-gas bremsstrahlung and intra-beam scattering, in addition to the synchrotron radiation damping effects. This is a general method which can also be applied to other electron rings.

关键词： ATF halo distribution beam-gas scattering beam-gas bremsstrahlung intra-beam scattering

Symmetries of the interacting boson model

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Frontiers of physics 2018年第6期13卷 79-88页

作者： p. Van Isacker Grand Accelerateur National d'Ions Lourds CEA//DRF CNRS//IN2P3 Bd Henri Becquerel BP 55027 F-14076 Caen France

This contribution reviews the symmetry properties of the interacting boson model of Arima and Iachello. While the concept of a dynamical symmetry is by now a familiar one, this is not necessarily so for the extended notions of partial dynamical symmetry and quasi dynamical symmetry, which can be beautifully illustrated in the context of the interacting boson model. The main conclusion of the analysis is that dynamical symmetries are scarce while their partial and quasi extensions are ubiquitous.

关键词： interacting boson model

Elliptic flow of direct photons in Au+Au collisions at 200 GeV

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Chinese physics C 2010年第9期34卷 1433-1435页

作者：刘复明 Tetsufumi Hirano Klaus Werner 朱燕 Institution of particle physics Huazhong Normal University Department of physics The University of Tokyo Laboratoire SUBATECH University of Nantes-IN2P3/CNRS-Ecole desMines

The rapidity dependence of the elliptic flow of direct photons in Au＋Au collisions at√ s NN = 200 GeV are predicted,based on a three-dimensional ideal hydrodynamic description of the hot and dense *** rapidity dependence of the elliptic flow v 2 （y） of direct photons （mainly thermal photons） is very sensitive to the initial energy density distribution along longitudinal direction,which provides a useful tool to extract the realistic initial condition from measurements.

关键词： thermal photons elliptic flow hydrodynamics