简介：UsingtheefectiveHamiltonianmethod,weanalyzetheB0-ˉB0mixingintheextensionofthestandardmodel(SM)wherebaryonnumberandleptonnumberarelocalgaugesymmetries.ThenumericalresultsindicatethecorrectionfromtheextraparticlestothemassdiferencemBissignificant.Thereisa60%enhancementcomparedtotheSMpredictionformBatmost,whichagreeswiththecurrentexperimentalresult.

简介：Thereisagrowingsupportforthelowlyingscalarmesonsf0(500),f0(980),a0(980),and(800)tobegenerateddynamicallyfromtheinteractionofpseudoscalarmesons,whilethecaseofthenextsetofscalarresonancesathigherenergies,f0(1370),f0(1710),K0(1430)ismoreaquestionofdebate.Soisthecaseofthetensorresonancesf2(1270),f′2(1525),K2(1430).AnewperspectiveonthesestateshasbeenofferedinRef.[1]wherethef0(1370)andf2(1270)resonancesareshowntobegeneratedfromtheinteractionprovidedbythelocalhiddengaugeLagrangiansimplementingunitarization.Itisshownthattheideaofthenatureofthesestatesasvectormeson-vectormesoncompositestateshasbeentestedinmanyreactions.Yet,thepermanentdiscussionoftheissuedemandsextrachecksforotherobservablesand,inthissense,theweakdecaysbringanewsourceofvaluableinformationthatshouldservetotestdifferentmodels.

简介：Inthisarticle,wecalculatethecontributionfromthenonfactorizablesofthadronicmatrixelementtothedecayB~0→χc1~π~0withthelight-conequantumchromo-dynamic(QCD)sumrules.Thenumericalresultsshowthatitscontributionisratherlargeandshouldnotbeneglected.Thetotalamplitudesleadtoabranchingfractionwhichisinagreementwiththeexperimentaldatamarginally.

简介：春节．过生推荐的旅游地不过是近处的海南、远一点的港澳，再远点的夏威夷，主打的招牌也不外是热火朝天的吃喝玩乐，每一次满载而归的朋友们无不这样感慨：玩到筋疲力尽，4天3夜的行程像在拼命。如果这一次只想反璞归真、避开节日的喧嚣．找个地方住来，

简介：SAMisanetwork-distributeddatamanagementsystemdevelopedatFermilabforusewithRunIIdata,ItisbeingEmployedbytheD0Experimenttostore,manage,deliver,andtrackprocessingofalldata.Wedescribethedesignandfeaturesofthesystemincludingresourcemanagementanddatatransfermechanisms,WeshowtheoperationalexperienceD0hasaccumulatedtodateincludingdataacquisitionprocessing,andalllevelsofaccessanddelivery.Wepresentvariousconfigurationsofthesystemanddescribetheiruseinthecollaboration.

简介：In2010,theBESCollaboration[1]foundaclearenhancementintheK0K0massdistributionintheJ=ψ!ηK0K0decay.SuchanenhancementisusuallyasignatureofanL=0resonancearoundthreshold,whichinthiscasewouldcorrespondstoanh1statewithquantumnumbersIG(JPC)=0??(1+??).Thish1statewaspredictedbytheChiralUnitarytheoryintheKKinteraction.Becauseoftheconversationlaw,thisstatecanonlydecaytoK0K0channel,andcanbestudiedefficientlyintheJ=ψ!ηK0K0decay.

简介：牛顿环实验中确定最佳测量环数是实验和计算的一个重要方面，本文首先确定实验要求的相对误差，然后运用误差理论得到最佳测量环数，其结果与文献采用的方法相一致。该方法的结果是简化测量和计算工作量的有效方法，提供了物理实验测量和计算理论分析的一种方法。

简介：WereportonthefirstoperationsofthereconstructionfarmsfortheD0experiment.Datawerereadfromataperobotto50PC'srunningLinux,processed,spooledtoacentraldiskbufferformergingandthenwrittenbacktothetaperobot.Thefarmsarebeingusedsuccessfullytoreconstructthedataasitcomesin.Transferrateswelloverthe12.5MB/secneededforfulldatarateshavebeenachieved.

简介：Oneofthekeycomponentsofanygridarchitectureismanagingcomputeandstorageresourcesandoptimizingtheirutilization.SAMhasimplementedfeaturesthatallowittoexercisea"fairshare"and"prioritized"policyamongmanygroupsofusers.Thegoalsareasfollows:1)implementthexperimentspoliciesforresourceusagebyresearchgroupandbydataaccessmode,and2)optimizetheresourceusagetomaximizetheoverallthroughputdefinedintermsofrealdataprocessingactivity,AtthelowestlevelofSAMarchitecture,calledthestation,theSAMsystemintegratesthedatadeliveryandcachemanagementwiththejobcontrolandschedulingofthebatchsystem.Atthesite-level,forexampleatFermilab,requestsfordatafromon-sitestationsaremanagedtooptimizeMassStorageSystemresourcesandnetworkthroughput,Managementofresourcesatavariousgeographiclevelsarediscussed.

简介：由使用打Iasupernovae(SNIa)直接提供光明距离(LD)，哪个取决于哈勃常数H0=100hkm的价值吗？

简介：IGUANA（InteractiveGraphicsforUserANAlysis)isaC++toolkitfordevelopinggraphicaluserinterfacesandhighperformance2-Dand3-Dgraphicsapplications,suchasdatabrowsersanddetectorandeventvisualisationprograms.TheIGUANAstrategyistousefreelyavailablesoftware(e.g.Qt,SoQt,OpenInventor,OpenGL,HEPVis)andpackageandextendittoprovideageneral-purposeandexperiment-independenttoolkit.WedescribetheevaluationandchoicesofpubliclyavailableGUI/graphicssoftwareandtheadditionalfunctionalitycurrentlyprovidedbyIGUANA.WedemonstratetheuseofIGUANAwithseveralapplicationsbuiltforCMSandD0.

简介：Aswellknown,iftheHiggsbosonwerenotobservedatLHC,thetechnicolormodelwouldbethemostfavorablecandidateresponsibleforthesymmetrybreaking.Toovercomesomedefectsinthepreviousmodel,someextendedversionshavebeenproposed.IntheTC2modeltypicalsignatureisexistenceofheavyH_(TC)andtechnipionП.Adirectproofofvalidityofthemodelistoproducethemataccelerator.Thuswestudytheproductionratesofe~+e~-→H_(TC)П~0ande~+e~-→П~+П~-atILCinthetopcolor-assistedtechnicolor(TC2)model.Infact,thereisafloodofmodelsbelongingtonewphysics,whichcanresultinproductswithcharacteristicssimilartoH_(TC)+ПoftheTC2model.ThereforetodistinguishthismodelfromothersonemayneedtoinvestigatesomedetailsbycalculatingthecrosssectiontoNLO.WeindeedfindthattheNLOcorrectionsaresignificant,namelytheratioδ2≡(σ_(NLO)-σ_(LO))/σ_(LO)ine~+e~-→H_(TC)П~0exceeds100%withinaplausibleparameterspace.

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简介：用激光照射牛顿半环来演示薄膜台阶的等厚干涉现象和测定薄膜厚度。

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简介：ThespectrumoftheΣ(1193)excitedstates,Σ,withisospinI=1andstrangenessS=??1isoneofthemostimportantissuesinhadronicphysics.TheΣresonancesaremostlyproducedandstudiedinK-inducedreactions.ManyΣresonancesarenowcatalogedbytheParticleDataGroup[1].However,ourknowledgeoftheseresonancesisstillverypoor.Intheenergyregionbelow2GeV,onlyafewofthemarewellestablished,suchastheΣ(1385)ofspin-parityJP=3=2+,Σ(1670)ofJp=3=2??andΣ(1775)ofJp=5=2??.Theothersarenotwellestablishedandsomeofthemareevenoflargeuncertaintiesontheirexistence.Thus,thestudyoftheΣresonancewiththeavailableexperimentaldataisnecessary.

简介：对牛顿环实验中干涉宽度的变化对测量过程中各种物理量的影响进行分析，提出了牛顿环实验数据处理方法，找到了减小测量误差钧途径。

简介：锁相环路(PLL)是一个能够跟踪输入信号相位的闭环自动控制系统，具有载波跟踪特性，可以提取淹没在噪声中的信号。锁相环可分为全数字锁相和取样锁相环。其中取样锁相环为数模混合锁相环路，又可分为分谐波采样锁相环和分频式锁相环。分频式锁相环具有较高的稳定度、较低的相位噪声和易于集成等优点，而分谐波采样锁相环还可以提供更低的相位噪声，它们在通信技术中都有着广泛的应用。

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