简介:UsingtheefectiveHamiltonianmethod,weanalyzetheB0-ˉB0mixingintheextensionofthestandardmodel(SM)wherebaryonnumberandleptonnumberarelocalgaugesymmetries.ThenumericalresultsindicatethecorrectionfromtheextraparticlestothemassdiferencemBissignificant.Thereisa60%enhancementcomparedtotheSMpredictionformBatmost,whichagreeswiththecurrentexperimentalresult.
简介:Thefeaturesofthelow-lyingspectraoffour-bodyA+B-A+B-systemshavebeendeducedbasedonsymmetry.Usingthemethodoffew-bodyphysics,wecalculatetheenergyspectraofA+B-A+B-systemsinaharmonicquantumdot.Wefindthatthebiexcitoninatwo-dimensionalquantumdotmayhaveotherboundexcitedstatesandthequantummechanicalsymmetryplaysacrucialroleindeterminingtheenergylevelsandstructuresofthelow-lyingstates.
简介:WeinvestigateindetailtheeffectsofR-parityleptonnumberviolationonthedecay~↑b1→b~↑x1^0intheR-parityviolatingminimalsupersymmetricstandardmodel(Rp-MSSM)underthepresentexperimentalconstraintsonRpparameters.Inournumericalcalculationsweconsidertwocasesofinputparametersofthesquarkandsleptonsectors,MsquarkMslepton,forcomparison.TheresultsshowthattherelativeR-parityviolatingcorrectionisnotverysensitivetothemassofthelightestneutralino-0↑x1andthedegenerateR-parityviolatingcouplingparameterλ2′,butstronglydependsonMsquark,Mslepton,tanβandthedegenerateR-parityviolatingcouplingparameterλ1′.Therelativecorrectionisabout-4~3%andcanexceed-6%insomeregionofparameterspace.Therefore,preciseexperimentanalysesonthedecay~↑b1→b~↑x1^0mayprovideaprobeoftheR-parityviolation.
简介:一个新算法被介绍产生开发通过一条Bézier曲线的表面把一根准线称为的有能力的Bézier。算法基于微分几何学理论在上必要;为是的表面的足够的条件发展能,;在为参数曲线的度评估公式上;为伯恩斯坦基础的线性独立。没有非线性的典型方程不得不被解决。而且为一个锥的顶点;为正切表面的回归的边能容易被获得。Aumann的算法为开发有能力的表面是这篇论文的一种特殊情况。
简介:BasedonthelowenergyeffectiveHamiitonianwithnaivefactorization,wecalculatethebranchingratios(BRs)andCPasymmetries(CPAs)forthetwentythreedoublecharmdecaysB/Bs→Ds*Ds*inboththestandardmodel(SM)andtheminimalsupergravity(mSUGRA)model.Withintheconsideredparameterspace,wefindthat(a)thetheoreticalpredictionsfortheBRs,CPAsandthepolarizationfractionsintheSMandthemSUGRAmodelareallconsistentwiththecurrentlyavailabledatawithin±2σerrors;(b)Foralltheconsidereddecays,thesupersymmetriccontributionsinthemSUGRAmodelareverysmall,lessthan7%numerically.ItmaybedifficulttoobservesosmallSUSYcontributionsevenatLHC.