CEPC上的2016年理论物理进展PPT课件

1、CEPC上的2016年理论物理进展贾宇贾宇 (on beha(on behalf lf of of 吕才典吕才典) )国际国际创新海外团队，院前沿重点项目暨所创新团队创新海外团队，院前沿重点项目暨所创新团队20162016年联合年联合年会年会 Nov. 18, 2016Nov. 18, 2016Using Muon Magnetic Moment & Higgs Coupling; “Constraining Natural SUSY using the Higgs Coupling and Muon Magnetic Moment Measurements” Basic constr

2、aints: REWSB, neutralino LSP, sparticle mass, Higgs mass, B-physics, fine-tuning. Muon magnetic moment Higgs couplingConstraining Natural SUSY HL-LHC, ILC & CEPC by 王科臣2王科臣 PRD93 (2016) 055040 3The Zbb couplings at future e+ e colliders. S. Gori, J. Gu and L.T. Wang, JHEP 1604, 062 (2016)Disting

3、uishing Majorana and Dirac Using Kinematical Distributions C.O. Dib, C.S. Kim, Kechen Wang and J. Zhang, PRD94, 013005 (2016)Sterile Neutrino Search LHC & CEPCWe+eNM_W(q)12(k )(k )12*We+eNDeW(q)12(k )(k )12+*Fi gure 2. T he di agram for the l epton num ber conservi ng (LN C ) decay W+ e+e+e,w hi

4、 ch i s m edi ated by ei ther a D i racor M ajorana neutri no.T he correspondi ng squared m atri x el em ent,averaged over i ni ti alpol ari zati ons,now i s:| M |2= 25623G3FM2W| UN eUN |21(k2N m2N)2+ m2N2N(4)(k1 2) 2(k k2) (k 1)+2M2W(q k)(q 1) m2N(k2 1)+2M2W(q k2)(q 1),w here the m om enta are nam

5、ed as before. A gai n,one finds the spectrum over the energy,E,i n the i nterm edi ateneutri no N rest fram e: (W+ e+e+e)=G3FM3W1224| UN eUN |2mNN1 m2NM2W21 +m2N2M2WmN/20dEmN2E223E3,(5)LNV:LNC:6yxz12+2e+e+22ZHTabl e 1:The subsetofd= 6 operators thatcontri bute toH ! Z +ande+e! H Zi n thebasi sdefine

6、d i n R ef . 14 .The f our-l epton operatorgi ven i n Eq.(8)gi vesan i ndi rectcontri buti onsol el y through the redefini ti on ofGFand i s not l i sted i n thi s tabl e.4D2X22 22DO = ( )( )OW= ( )WIWIO(1)= (i$D )()OD= (D )(D )OB= ( )BBO(3)= (i$DI )(I)OW B= (I )WIBOe= (i$D )(ee)OfW= ( )fWIWIOeB= (

7、)eBBOfW B= (I )fWIBT he operators consi dered i n thi s work are l i sted i n Tab. 1. T he notati on andconventi onsf ol l ow those ofR ef. 33 .T he H i ggsdoubl eti sdenoted .T he fiel d strengthtensors for theSU(2)L U(1)Ygauge group areWI=WI WI gIJKWJWK,I= 1,2,3,B=B B,(3)w i th the gauge coupl i n

8、gsgandg0,respecti vel y. W i th a ti l de we denote the dualfiel dstrength tensorseX=12 X(4)w hereX=WI,Band0123= + 1. W hen acti ng onSU(2) doubl ets,the covari antderi vati ve i s w ri ttenD=+igI2WI+ig0Y B,(5)w hereYi s the hypercharge andIare the Paul im atri ces. In Tab.1 the l ef t-handedl epton

9、 doubl ets and the ri ght-handed charged l eptons are w ri ttenipandep,w herei= 1,2 andp= 1,2,3 are weak-i sospi n and flavour i ndi ces,respecti vel y. W e m ake thesi m pl i f yi ng assum pti on,stronger than m i ni m alflavour vi ol ati on,that the coef f i ci ents(1),(3),andeare flavour i ndepen

10、dent,and define the f erm i on-bi l i near operatorsw i th flavour i ndi ces contracted. Because ofthi s the operators are herm i ti an and al lcoupl i ngskare real . A few com m ents on the operators i n Tab.1 are i n order.T he 22Dtype operators yi el d contactH Z i nteracti ons as wel las m odi f

11、ica-ti ons ofthe gauge-boson coupl i ngs to l eptons.T heX22operators generate anom al ous coupl i ngs ofthe H i ggs toZ Z, Z,andW W. A f ter perf orm i ng fiel d redefini ti ons of the gauge fiel ds, the SMH i ggscoupl i ngs to gauge bosons are not m odi fied due to cancel l ati ons agai nst thered

12、efini ti ons ofi nput param eters (see R ef. 34and Eq.(6) bel ow ).typi calcontri buti on f rom ad= 6 operator scal es asm2H/2w hi ch i s 5-10 ti m es l arger f or of afew TeV .4Angular Asymmetry in HZ Production CEPCTo Constraining New Physics; “Beyond Higgs Couplings: Probing the Higgs with Angula

13、r Observables at Future e+e- Colliders”, Nathaniel Craig, Jiayin Gu, Zhen Liu and Kechen Wang, JHEP 1603 (2016) 0507王科王科臣臣 顾嘉荫顾嘉荫Angular Asymmetry in HZ Production CEPC8To Constraining New Physics; “Beyond Higgs Couplings: Probing the Higgs with Angular Observables at Future e+e- Colliders”, Nathani

14、el Craig, Jiayin Gu, Zhen Liu and Kechen Wang, JHEP 1603 (2016) 050Progress in lattice QCD study（by 刘朝峰） CEPC is also a flavor factory Flavor physics and LQCDCan be calculated by LQCD例如：例如：FLAG2016, arXiv:1607.00299Zhaofeng Liu et al., PRD90, 2014Y.-B. Yang, ZL et al., PRD92, 2015物理夸克质量点上的物理夸克质量点上的格

15、点格点计算计算(正在进正在进行行)16CEPC can measure production cross section for (ZH) to an exquisite precision of 0.51%Knowing the NLO EW correction (a few percent) is not sufficient to meet experimental precision!O(2) and O(s) correction need be considered.We will investigate the latter, which should be much dominant 171819arXiv:1609.03995Collaborators: 冯锋(中国矿大)，桑文龙(西南大学)，孙庆峰(中科大)。20Similar results from diffe