DIS-Parity. Search for New Physics Through Parity Violation In Deep Inelastic Electron Scattering. The Physics Case
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1 DIS-Parity Sarch for Nw Physics Through Parity Violation In Dp Inlastic Elctron Scattring Th Physics Cas R. Arnold for th DIS-Parity Collaboration Exprimnt Plan by Stv Rock will follow 12 Jun 2003 DIS-Parity SLAC EPAC 1
2 DIS-Parity Collaboration Argonn Old Dominion U UC Brkly Smith Collg CalTch SLAC Jffrson Lab Syracus U Los Alamos Nat Lab U Virginia U Maryland William and Mary UMass Yrvan UNA Mxico Mor xpctd to join 12 Jun 2003 DIS-Parity SLAC EPAC 2
3 Standard Modl Elctrowak Thory Basd on gaug group SU(2) L X U(1) with isotriplt fild W and isosinglt fild B SU(2) L coupling is g, U(1) coupling is g Aftr spontanous symmtry braking via Higgs mixing of W and B filds producs obsrvd particls On on slid? SM fixd by 3 paramtrs Chargd bosons Nutral bosons EM charg ~ a EM g ~ G F from m liftim Vctor couplings Axial couplings frmion wak isospin frmion charg q/ 12 Jun 2003 DIS-Parity SLAC EPAC 3 M Z sin 2 (q W ) and all ls follows
4 Byond th Standard Modl Givn a EM, G F, and M Z prdict sin 2 (q W ) and couplings (quark, lpton, and Higgs masss ndd for EW radiativ corrctions) Find nw physics by dviations from SM prdictions High nrgy production Cross sctions ~ Nw physics ~ amplitud 2 High mass hard to s + - 2? Nw vry small? 2 Prcision EW via PV Nw physics ~ amplitud Mak high mass xchang visibl A PV ~ 12 Jun 2003 DIS-Parity SLAC EPAC 4 g Bat larg against small to s nw Z +?
5 DIS-Parity Probs -Z-quark Intraction Us Z scattring as short distanc prob for nw physics Cross sction s R + s L ~ g + Z 2 g-z amplituds intrfr in SM PV Asymmtry s R - s A L PV = ~ s R + s L g-q larg and wll undrstood g Short distanc -Z-q prob SM valu known 12 Jun 2003 DIS-Parity SLAC EPAC 5 g Z 2 +? Look for small nw physics
6 PV Asymmtry Ariss from Axial Z Couplings -Z-q cofficints Axial on th lctron Vctor on th quark Axial on th quark Vctor on th lctron C 1u C 1d C 2u C 2d g A g A g g V V Z g V q Z Z Z g q V g q g q A A up down up down 12 Jun 2003 DIS-Parity SLAC EPAC 6
7 -Z-quark Couplings in Standard Modl Compltly fixd by sin 2 (q w ) and EW radiativ corrctions Nw physics may modify th couplings 12 Jun 2003 DIS-Parity SLAC EPAC 7
8 Nw Physics Can Modify -q Coupling 4-Frmi Contact Havy short rang int Nw Z g A g nw g A g V q L nw g nw Z g V q up up up Lptoquarks Compositnss LQ up 12 Jun 2003 DIS-Parity SLAC EPAC 8 up
9 Summary of Elctrowak Data Wintr 2003 Larg c 2 NuTV 12 Jun 2003 DIS-Parity SLAC EPAC 9
10 World Elctrowak Data Dominatd by masurmnts at Z pol from LEP and SLAC-SLD c 2 /dof ~ 30.4/15 Probability ~ 1.5% Lptonic (A LR ) and hadronic (A FB ) Z couplings sm inconsistnt NuTV sin 2 (q W ) is 3s abov SM Hints for nw physics? Rquirs mor complmntary xprimnts with small rrors off th Z pol 12 Jun 2003 DIS-Parity SLAC EPAC 10
11 Elctrowak Physics Away from Z pol Amplitud at Z pol is pur imaginary Z No intrfrnc with nw physics? Asymmtry masurmnts away from Z pol can sns nw physics invisibl at th Z pol Various probs tst diffrnt parts of Lagrangian DIS-Parity Mollr-E158 NuTV n m n Z Z W + Z Smi-lptonic Lptonic Chargd Nutral 12 Jun 2003 DIS-Parity SLAC EPAC 11 n
12 Running of sin 2 (q W ) with Q 2 SM Rnormalization Group Evolution + rad corrctions Nds to b tstd E158 Prliminary NuTV APV (Cs) SLC, LEP Prcis masurmnts off th Z pol ar rquird 12 Jun 2003 DIS-Parity SLAC EPAC 12
13 Prcis Low Q 2 PV Exprimnts Mollr- E158 DIS-Parity Q-Wak(JLAB) Atomic Parity V g Z g Z p g Z n Z g Cs 133 Pur lptonic, Incohrnt Cohrnt quarks Cohrnt quarks isoscalar quarks proton ntir nuclus In progrss Wll undrstood Rsults ~2008 Larg syst. rrors small corrctions atomic, nuclar structur No quarks (2C 1u -C 1d )+Y(2C 2u -C 2d ) -2(2C 1u +C 1d ) -376C 1u - 422C 1d 12 Jun 2003 DIS-Parity SLAC EPAC 13
14 DIS-Parity Asymmtry X > 0.3 valnc dominatd kinmatic Y ~ 0.8 mphasiz C 2 12 Jun 2003 DIS-Parity SLAC EPAC 14
15 DIS-Parity Snsitivity to C 1 and C 2 (2C 1u -C 1d )+Y(2C 2u -C 2d ) (+/- 0.6%) stat (+/- 0.6%) syst intrcpt slop 2C 2u -C 2d 2C 1u -C 1d 12 Jun 2003 DIS-Parity SLAC EPAC 15
16 DIS-Parity is a Powrful Prob for Nw Physics g-z intrfrnc raiss small PV amplituds to visibility Probs short rang -Z-q coupling (smi-lptonic Z xch) Complmntary to E158(lptonic), NuTV (W and Z xch) Far from Z pol - physics invisibl at Z may show up Clan raction - incohrnt scattring on valnc quarks No larg QCD (nuclar) corrctions SM radiativ corrctions ar wll undrstood 12 Jun 2003 DIS-Parity SLAC EPAC 16
17 Why DIS-Parity Now? NuTV discrpancy and larg c 2 at Z pol dmand mor prcision low Q 2 data from complmntary xprimnts. No singl xprimnt ss all faturs nd orthogonal data DIS-Parity would improv a factor 20 ovr prvious data. DIS-PV pionrd by SLAC E-122 (Prscott, 1978) sin 2 = ± q W Establishd modrn EW modl 12 Jun 2003 DIS-Parity SLAC EPAC 17
18 DIS-Parity is Optimizd for Physics Rach and Clan Intrprtability Kinmatics - Q 2 > 16 GV 2, Supprss high twist W > 3 GV x Bj > 0.3 E /E > 0.3 Y > 0.6 No rsonanc rgion Mostly valnc quarks Small radiativ corrctions Snsitivity to C 2 couplings Spctromtr - clanly masurs scattrd lctrons Dutron targt - Insnsitiv to quark distribution - No larg QCD corrctions (small charg symmtry corrrction) Idal match to xisting SLAC facilitis 12 Jun 2003 DIS-Parity SLAC EPAC 18
19 Possibl DIS-Parity and World sin 2 (q W ) Can assum th Standard Modl and rduc rsult to ffctiv sin 2 (q W ) for comparison. 12 Jun 2003 DIS-Parity SLAC EPAC 19
20 DIS-Parity Possibl Rsults for C 1 and C 2 Mor powrful sarch for nw physics by dirct comparison with SM prdictions for C 1 and C 2. Nw physics scnarios giv diffrnt ffcts, orthogonal data sorts out candidats. 2C 2u -C 2d C 2d 2C 1u -C 1d C 2u 12 Jun 2003 DIS-Parity SLAC EPAC 20
21 Snsitivity to Nw Physics Nw Z Z Mixing with Z is small from Z pol data Bst currnt mass limit ~600 GV from Tvatron Run I high mass DY Run II may xtnd limit to ~1 TV DIS-Parity Z mass limit ~1.5 TV Strongst limit for Z LR with symmtric L and R coupling Dos not dpnd on mixing with Z 12 Jun 2003 DIS-Parity SLAC EPAC 21
22 Coupling combinations that giv parity violation Snsitivity to Nw Physics Compositnss Exampl for LL coupling non zro Othr hlicitis similar Larg and difficult syst. corrctions 12 Jun 2003 DIS-Parity SLAC EPAC 22
23 Snsitivity to Nw Physics Lptoquarks 95% conf. Tvatron Run II possibl improvmnt 12 Jun 2003 DIS-Parity SLAC EPAC 23
24 DIS-Parity Physics Summary Adds significant constraints on Nw physics Adds anothr prob (DIS) to sarch for Nw physics Adds nw prcision obsrvabls - C 2u and C 2d Orthogonal to othr prcision data Ndd to hlp clarify th World EW story Small and wll controlld thortical uncrtaintis Timly - bats mass rach of currnt data bfor LHC Doabl - uss wll known tchniqus and tchnology Only SLAC can do this 12 Jun 2003 DIS-Parity SLAC EPAC 24
25 DIS-Parity Exprimnt Plan and Errors (prliminary) Stv Rock will dscrib in dtail 12 Jun 2003 DIS-Parity SLAC EPAC 25
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