Electroweak studies and search for new phenomena at HERA

Transcription

1 Elctrowak studis and sarch for nw phnomna at HERA A.F.Żarncki Warsaw Univrsity for ZEUS A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p./25

2 Outlin Introduction HERA and xprimnts A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.2/25

3 Outlin Introduction HERA and xprimnts Dp Inlastic ± p Scattring Masurmnt of high Q 2 NC and CC DIS A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.2/25

4 Outlin Introduction HERA and xprimnts Dp Inlastic ± p Scattring Masurmnt of high Q 2 NC and CC DIS Elctrowak studis Obsrvation of parity violation and polarization asymmtry QCD and Elctrowak analysis of HERA data A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.2/25

5 Outlin Introduction HERA and xprimnts Dp Inlastic ± p Scattring Masurmnt of high Q 2 NC and CC DIS Elctrowak studis Obsrvation of parity violation and polarization asymmtry QCD and Elctrowak analysis of HERA data Sarchs for nw phnomna Contact Intractions and lptoquarks Isolatd lptons A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.2/25

6 Outlin Introduction HERA and xprimnts Dp Inlastic ± p Scattring Masurmnt of high Q 2 NC and CC DIS Elctrowak studis Obsrvation of parity violation and polarization asymmtry QCD and Elctrowak analysis of HERA data Sarchs for nw phnomna Contact Intractions and lptoquarks Isolatd lptons Conclusions A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.2/25

7 Introduction HERA lctron(positron)-proton collidr at DESY + / p HERA luminosity GV 820 GV 920 GV HERA I about 0pb collctd pr xprimnt mainly + p data Intgratd Luminosity (pb - ) Days of running A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.3/25

8 Introduction HERA lctron(positron)-proton collidr at DESY + / 27.5 GV p 820 GV 920 GV HERA I about 0pb collctd pr xprimnt mainly + p data HERA II ovr 300pb pr xprimnt (so far) mor p data Intgratd Luminosity (pb - ) HERA dlivrd days of running A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.3/25

9 Introduction HERA II Spin Rotator Longitudinal Polarimtr Spin Rotator Through th mission of synchrotron radiation lctron bam at HERA bcoms transvrsly polarizd Spin Rotator Spin Rotator Spin Rotator Spin Rotator Spin Rotators installd to obtain longitudinal polarization at IP Transvrs Polarimtr p Bam Dirction A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.4/25

10 Introduction HERA II Spin Rotator Longitudinal Polarimtr Spin Rotator Through th mission of synchrotron radiation lctron bam at HERA bcoms transvrsly polarizd Spin Rotator Spin Rotator Spin Rotator Spin Rotator Spin Rotators installd to obtain longitudinal polarization at IP Transvrs Polarimtr p Bam Dirction - Luminosity /pb p Polarisation /% H Collaboration - Luminosity /pb p Polarisation /% A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.4/25 H Collaboration Polarization masurd in ddicatd polarimtrs Avrag polarization 30-40%

11 Introduction H ZEUS ZEUS Two omni-purpos dtctors Both quippd with silicon tracking, drift chambrs, hrmtic calorimtry and muon dtctor systm A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.5/25

12 Introduction H ZEUS ZEUS Fin-graind LAr calorimtr: σ E /E = 2%/ E % (l) σ E /E = 55%/ E % (had) Backward lad-scintillator calorimtr: σ E /E = 7%/ E % (l) Uranium-scintillator calorimtr: σ E /E = 8%/ E (l) σ E /E = 35%/ E (had) A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.5/25

13 ) ) / 3 3 ( 0 /. ' ) 4 3 ' ' ) 3 7 Dp Inlastic ± p Scattring Main procss studid at H and ZEUS Scattring of lctron/positron off proton with: larg four-momntum transfr and larg invariant mass of hadronic final stat. In th QPM it is dscribd by xchang of gaug boson btwn lpton and quark. Kinmatic variabls: ) ' ) + ( * 02 0 ' virtuality of th xchangd boson spatial rsolution λ /Q - *, * snsitivity to mass scals Λ Q ) 65 ) 5 &% ) 65 $ " #"! A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.6/25

14 9G G M P P F N M L O = E; G 9G : Q R P E E; G 9G : R P SO C A BA@ 8>? G : 8 R Dp Inlastic ± p Scattring Main procss studid at H and ZEUS Scattring of lctron/positron off proton with: larg four-momntum transfr and larg invariant mass of hadronic final stat. In th QPM it is dscribd by xchang of gaug boson btwn lpton and quark. Kinmatic variabls: ; 9G E; 9G N2O N E ; virtuality of th xchangd boson I F H ; : 9= < K H J H < <&D fraction of proton momnta carrid by stuck quark q invariant mass M q = x s ; 9: A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.6/25

15 Uc c i l l b j i h k Y aw c Uc Vm n l a aw c Uc V n l ok _ ] ^]\ TZ[ c V T n Dp Inlastic ± p Scattring Main procss studid at H and ZEUS Scattring of lctron/positron off proton with: larg four-momntum transfr and larg invariant mass of hadronic final stat. In th QPM it is dscribd by xchang of gaug boson btwn lpton and quark. Kinmatic variabls: W Uc aw Uc j2k j a W virtuality of th xchangd boson b d W V UY X g d f d fraction of proton momnta carrid by stuck quark X X&` W UV fraction of lpton nrgy transfrd in th proton rst fram scattring angl in th q CMS A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.6/25

16 p ƒ Š Dp Inlastic ± p Scattring NC DIS (Nutral Currnts) γ/z xchang: + + E θ v wvut qsr u v ~r q} { xzy { x y t r p q γ,z Scattrd lpton AND currnt jt masurd in th final stat. Kinmatic Rconstruction q γ Ž Œ ˆ lctron: E, θ H A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.7/25

17 Dp Inlastic ± p Scattring NC DIS (Nutral Currnts) γ/z xchang: + + E θ γ,z q p q γ Scattrd lpton AND currnt jt masurd in th final stat. Kinmatic Rconstruction XY Viw lctron: E, θ angls: θ, γ H ZEUS A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.7/25

18 Dp Inlastic ± p Scattring CC DIS (Chargd Currnts) W ± xchang: + p q W + q ( ) ν E j Only currnt jt masurd in th final stat. γ Q**2 = 2475 y = 0.55 M = 98 Kinmatic Rconstruction hadronic final stat E j, γ A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.8/25

19 Dp Inlastic ± p Scattring CC DIS (Chargd Currnts) W ± xchang: + ( ) ν p q W + q E j Only currnt jt masurd in th final stat. γ Kinmatic Rconstruction hadronic final stat E j, γ XY Viw ZR Viw A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.8/25

20 Dp Inlastic ± p Scattring High Q 2 NC & CC DIS ) 2 HERA II Contribution from wak boson xchang bcom important for: Q 2 M 2 Z, M 2 W (pb/gv 2 dσ/dq - + H p NC (prl.) - H p NC 2005 (prl.) + ZEUS p NC ZEUS p NC (prl.) + SM p NC (CTEQ6M) - SM p NC (CTEQ6M) Elctrowak unification NC & CC comparabl in siz Charg asymmtry in NC DIS: diffrnc btwn + p and p H p CC (prl.) - H p CC 2005 (prl.) + ZEUS p CC ZEUS p CC (prl.) + SM p CC (CTEQ6M) - SM p CC (CTEQ6M) Excllnt agrmnt with Standard Modl prdiction ovr many ordrs of magnitud -7 y < 0.9 P = Q (GV ) A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.9/25

21 Elctrowak studis High Q 2 NC DIS cross sction, nglcting contributions from F L d 2 σ NC ( ± p) dxdq 2 = 2πα2 [ Y+ xq 4 F2 0 Y xf3 0 ] Unpolarizd structur functions: F 0 2 = q whr: Y ± = ± ( y) 2 x(q + q) ( ) 2 q 2 q v q v P Z + (vq 2 + a 2 q)(v 2 + a 2 )PZ 2 xf 0 3 = q x(q q) ( ) 2 q a q a P Z + 4v q a q v a PZ 2 Masurmnt of xf 0 3 snsitiv to axial quark couplings, a q. P Z = sin 2 2θ W Q 2 M 2 Z + Q2 «A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p./25

22 Elctrowak studis High Q 2 NC DIS cross sction, nglcting contributions from F L d 2 σ NC ( ± p) dxdq 2 = 2πα2 [ Y+ xq 4 F2 0 Y xf3 0 ( + P Y+ F2 P Y xf3 P )] whr: Y ± = ± ( y) 2 Polarizd structur functions: P - lpton bam polarization F P 2 = q x(q + q) ( 2 q v q a P Z 2(vq 2 + a 2 q)v a PZ 2 ) xf P 3 = q x(q q) ( 2 q a q v P Z 2v q a q (v 2 + a 2 )PZ 2 ) Masurmnt of xf 0 3 snsitiv to axial quark couplings, a q. Masurmnt of F P 2 snsitiv to vctor quark couplings, v q. P Z = sin 2 2θ W Q 2 M 2 Z + Q2 «A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p./25

23 Elctrowak studis HERA I + HERA II Combind masurmnt of th proton structur function xf 0 3 (x, Q 2 ) xf 3 γz H (prl.) Q 2 =500 GV 2 HERA xf 3 γz ZEUS (prl.) Q 2 =500 GV 2 Assuming SM couplings: xf 0 3 ( 2 3 u v + ) 3 d v xp Z can b usd to constrain valnc quark dnsitis xf 3 γz x x H+ZEUS Combind (prl.) Q 2 =500 GV 2 H 2000 PDF ZEUS-JETS PDF x A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p./25

24 Elctrowak studis HERA II Combind masurmnt of NC DIS polarization asymmtris: A H (prl.) HERA A ZEUS (prl.) A ± = 2 σ ±p (P R ) σ ±p (P L ) P R P L σ ± p (P R ) + σ ± p (P L ) Dirct masurmnt of parity violation du to γ Z intrfrnc. To th first approximation A ± = F P 2 F 0 2 A A + A - H 2000 PDF 3 4 Q 2 (GV 2 ) H+ZEUS Combind (prl.) A + A - ZEUS-JETS PDF 3 4 Q 2 (GV 2 ) At high-x, assuming SM couplings: A ± u v + d v 4u v + d v can b usd to constrain d/u ratio A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.2/ A + A - H 2000 PDF ZEUS-JETS PDF 3 4 Q 2 (GV 2 )

25 Elctrowak studis HERA I + HERA II Masurmnt of th polarization dpndnc of CC DIS «d 2 σ ± p = ( ± P dxdq 2 ) G2 F M 2 2 W 4πx MW Q2 x ˆu + c + ( y) 2 ( d + s + b) >< for p x ˆ( y) 2 (d + s + b) + ū + c >: for + p (pb) σ CC ± Chargd Currnt p Scattring SM (H PDF 2000) - p νx H Data 2005 (prl.) H Data ZEUS Data 04-05(prl.) ZEUS Data p νx H Data ZEUS Data indpndnt constraints on u and d dnsitis at high x Q > 400 GV y < P A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.3/25

26 Elctrowak studis HERA I Combind QCD and Elctrowak analysis of H data only. High prcision of NC and CC DIS masurmnts allows for simultanous dtrmination of PDFs and lctrowak paramtrs: v u H (v u -a u -v d -a d -PDF) LEP prliminary v d H (v u -a u -v d -a d -PDF) LEP prliminary CDF CDF % CL % CL Standard Modl H - Standard Modl H a u Prcision of light quark coupling dtrmination similar to Tvatron No sign ambiguity. A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.4/25 a d

27 Elctrowak studis HERA I + HERA II Combind QCD and Elctrowak analysis of ZEUS data. Much highr statistics of p data (xf 3 / a q ) and lpton bam polarization (F P 2 / v q ) significant improvmnt of coupling dtrmination Rsults consistnt with SM prdictions, prcision comparabl with LEP. A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.5/25

28 Sarchs for nw phnomna Contact Intractions Possibl nw physics in NC DIS: Z q q q LQ, q ~ q For s much smallr than procss scal Λ ffctiv paramtrization: q η q qq contact intractions (CI) LQ Contribution to th NC cross-sction: q q q G G 2G 3... q q R q Z γ q dσ dx dq 2 (η) = dσ SM dx dq 2 [ + A(x, Q 2 ) η + B(x, Q 2 ) η 2] Gnral formula for all CI typ modls A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.6/25

29 Sarchs for nw phnomna Compositnss modls ZEUS analysis of HERA I + HERA II data Contact intraction coupling givn by η = ± 4π Λ 2 whr: Λ - compositnss scal Limits on Λ dtrmind from Q 2 distribution of NC DIS vnts N/N CTEQ5D N/N CTEQ5D ZEUS Contact Intractions Limits (prl.) ZEUS p VV Λ = 7.5 TV VV Λ + = 6.3 TV ZEUS (prl.) - p AA Λ = 5.9 TV AA Λ + = 6.3 TV Q 2 (GV 2 ) Contact Intractions Limits (prl.) 3 4 Q 2 (GV 2 ) A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.7/25

30 Sarchs for nw phnomna Compositnss modls ZEUS analysis of HERA I + HERA II data Contact intraction coupling givn by η = ± 4π Λ 2 whr: Λ - compositnss scal Limits on Λ dtrmind from Q 2 distribution of NC DIS vnts Limits rang from 2.0 to 7.5 TV Significant improvmnt from HERA II data VV AA VA X X2 X3 X4 X5 X6 U U2 U3 U4 U5 U6 LL LR RL RR ± p -/Λ 2 bst fit valu allowd ±/Λ 2 rang ZEUS (prl.) ± p +/Λ 2 bst fit valu Λ (TV) Λ + (TV) ±/Λ 2 (TV -2 ) A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.7/25

31 Sarchs for nw phnomna Larg Extra Dimnsions Kaluza-Klin graviton xchang CI with ffctiv scal η s/m 4 S N/N CTEQ5D N/N CTEQ5D ZEUS Larg Extra Dimnsions Limits (prl.) ZEUS p M S = 0.86 TV M S + = 0.88 TV ZEUS (prl.) - p Q 2 (GV 2 ) Quark form factor Smi-classical modl: N/N CTEQ5D dσ dq 2 = dσsm dq Quark Radius Limits (prl.) [ ZEUS 3 4 R q - quark radius R2 q 6 Q2 ZEUS (prl.) ± p R q 2 = ( cm) 2 R q 2 = -(0.8-6 cm) 2 ] 2 Q 2 (GV 2 ) R q < cm Larg Extra Dimnsions Limits (prl.) 3 4 Q 2 (GV 2 ) M + S > 0.88 TV A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.8/25

32 Sarchs for nw phnomna Rsonanc production Sarch for rsonant stats in q scattring lptoquarks or squarks in modls with R-parity violation H analysis of HERA II data factor 6 incras in p luminosity Invariant mass distribution for NC and CC DIS in vry good agrmnt with SM prdictions Evnts / 20 GV Evnts / 20 GV NC, P=-27% H data (prlim.) SM SM uncrtainty / GV 3 2 CC, P=-27% H data (prlim.) SM SM uncrtainty M LQ / GV M LQ A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.9/25

33 Sarchs for nw phnomna Rsonanc production Sarch for rsonant stats in q scattring lptoquarks or squarks in modls with R-parity violation λ H analysis of HERA II data factor 6 incras in p luminosity - xcludd S 0,L ZEUS (94 05) prlim. CI H (05) prlim. singl LQ H (94-00) singl LQ Invariant mass distribution for NC and CC DIS in vry good agrmnt with SM prdictions -2 S D0 pair prod. 0,L L3 indir. limit M LQ / GV Exclusion limits in mass-coupling plan For lctromagntic coupling F=2 lptoquarks blow GV xcludd A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.9/25

34 Sarchs for nw phnomna Isolatd lptons Most prominnt xcss ovr SM obsrvd in HERA? Evnts with isolatd lpton and larg missing transvrs momntum: p T = 37 GV phad T = 29 GV p T = 44 GV Rquir also larg acoplanarity significant supprssion of SM background A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.20/25

35 Sarchs for nw phnomna Isolatd lptons Most prominnt xcss ovr SM obsrvd in HERA? Evnts with isolatd lpton and larg missing transvrs momntum: p had T = 66 GV p T = 20 GV Rquir also larg acoplanarity significant supprssion of SM background A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.20/25

36 Sarchs for nw phnomna Isolatd lptons Only significant contribution to this signal in th SM is xpctd from W production with lptonic dcays. Main lading ordr diagrams: γ,z q γ,z q q W l ν q W l ν A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.2/25

37 Sarchs for nw phnomna Isolatd lptons Only significant contribution to this signal in th SM is xpctd from W production with lptonic dcays. Main lading ordr diagrams: γ,z q quark jt hadron transvrs momntum p X T q W l ν isolatd lpton larg transvrs momntum p l T nutrino larg missing transvrs momntum p T A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.2/25

38 Sarchs for nw phnomna Isolatd lptons Only significant contribution to this signal in th SM is xpctd from W production with lptonic dcays. Main lading ordr diagrams: γ,z q quark jt hadron transvrs momntum p X T q W l ν isolatd lpton larg transvrs momntum p l T nutrino larg missing transvrs momntum p T Standard Modl prdiction σ(p W ± X). pb. But only small fraction with larg hadron transvrs momntum, p X T. Larg p X T xpctd.g. from anomalous singl top production (FCNC). A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.2/25

39 Sarchs for nw phnomna Isolatd lptons H rsults from combind HERA I + HERA II data, ± and µ ± channl. Rconstructd distribution of th hadron transvrs momnta p X T : p Evnts 2 miss l+p T vnts at HERA ( p, 84 pb H Data (prlim.) All SM Signal - - ) N Data = 8 N = 24.4 ± SM p Evnts 2 miss + - l+p T vnts at HERA ( p, 258 pb ) H Data (prlim.) All SM Signal N Data = 38 N = 30.5 ± SM X P T (GV) and µ channls Good agrmnt with SM X P T (GV) and µ channls 3σ xcss for p X T > 25 GV N obs = 8 for N xp = 7.8 ±.3 A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.22/25

40 Sarchs for nw phnomna Isolatd lptons Rsult not confirmd by ZEUS analysis of HERA I + HERA II data! Rconstructd distribution of th hadron transvrs momnta p X T : p Evnts 2 ZEUS (Prl.) p Signal MC SM MC + p Evnts 2 ZEUS (Prl.) p Signal MC SM MC X P T (GV) Isolatd lptons with high transvrs momntum obsrvd, but with rat consistnt with SM xpctations! X P T (GV) A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.23/25

41 Sarchs for nw phnomna Isolatd lptons Summary of H and ZEUS rsults, PT X > 25 GV (status Fb 3th 2007) H (prl.) channl µ channl & µ comb. p (84 pb ) 3/3.8 ± 0.6 (6%) 0/3. ± 0.5 (74%) 3/6.9 ±.0 (67%) + p (258 pb ) /4. ± 0.8 (75%) 8/3.7 ± 0.6 (85%) 8/7.8 ±.3 (80%) ± p (442 pb ) 3/7.9 ±.4 (67%) 8/6.8 ±. (79%) 2/4.7 ± 2.3 (72%) ZEUS (prl.) channl µ channl 3/6.9 ±.0 (67%) p (204 pb ) 5/3.8 ± 0.6 (55%) 2/2.2 ± 0.3 (86%) + p (228 pb ) /3.2 ± 0.4 (75%) 3/3. ± 0.5 (80%) ± p (432 pb ) 6/7.0 ± 0.7 (64%) 5/5.3 ± 0.6 (82%) Excss obsrvd in and µ channl, but only in H + p data Updatd ZEUS rsults still in good agrmnt with SM prdictions Consistnt SM xpctations for both xprimnts A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.24/25

42 Sarchs for nw phnomna Isolatd lptons Summary of H and ZEUS rsults, PT X > 25 GV (status Fb 3th 2007) H (prl.) channl µ channl & µ comb. p (84 pb ) 3/3.8 ± 0.6 (6%) 0/3. ± 0.5 (74%) 3/6.9 ±.0 (67%) + p (258 pb ) /4. ± 0.8 (75%) 8/3.7 ± 0.6 (85%) 8/7.8 ±.3 (80%) ± p (442 pb ) 3/7.9 ±.4 (67%) 8/6.8 ±. (79%) 2/4.7 ± 2.3 (72%) ZEUS (prl.) channl µ channl 3/6.9 ±.0 (67%) p (204 pb ) 5/3.8 ± 0.6 (55%) 2/2.2 ± 0.3 (86%) 7/6.0 + p (228 pb ) /3.2 ± 0.4 (75%) 3/3. ± 0.5 (80%) 4/6.3 ± p (432 pb ) 6/7.0 ± 0.7 (64%) 5/5.3 ± 0.6 (82%) /2.3 H+ZEUS /4. ± 0.8 (75%) 8/3.7 ± 0.6 (85%) 3/6.9 ±.0 (67%) p 8/7.6 2/5.3 /2.9 + p /7.3 /6.8 22/4. ± p 9/4.9 3/2. 32/27.0 No significant xcss obsrvd in th combind H + ZEUS data A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.24/25

43 Conclusions HERA II High luminosity + polarization nw window for prcis EW studis. masurmnts of parity violation and polarization asymmtris in NC and CC DIS Proton PDF and EW paramtrs can b constraind from HERA data only A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.25/25

44 Conclusions HERA II High luminosity + polarization nw window for prcis EW studis. masurmnts of parity violation and polarization asymmtris in NC and CC DIS Proton PDF and EW paramtrs can b constraind from HERA data only NC and CC DIS at high Q 2 in vry good agrmnt with SM limits on dviations from SM st in diffrnt modls nonstandard quark couplings, contact intractions, LED, quark radius, lptoquarks A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.25/25

45 Conclusions HERA II High luminosity + polarization nw window for prcis EW studis. masurmnts of parity violation and polarization asymmtris in NC and CC DIS Proton PDF and EW paramtrs can b constraind from HERA data only NC and CC DIS at high Q 2 in vry good agrmnt with SM limits on dviations from SM st in diffrnt modls nonstandard quark couplings, contact intractions, LED, quark radius, lptoquarks Evnts with isolatd lptons and larg missing p T sizabl xcss ovr SM obsrvd in H + p data, no xcss at ZEUS A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.25/25

46 Conclusions HERA II High luminosity + polarization nw window for prcis EW studis. masurmnts of parity violation and polarization asymmtris in NC and CC DIS Proton PDF and EW paramtrs can b constraind from HERA data only NC and CC DIS at high Q 2 in vry good agrmnt with SM limits on dviations from SM st in diffrnt modls nonstandard quark couplings, contact intractions, LED, quark radius, lptoquarks Evnts with isolatd lptons and larg missing p T sizabl xcss ovr SM obsrvd in H + p data, no xcss at ZEUS HERA running coming to an nd soon Larg sampls of data collctd with polarizd lpton bams still bing analyzd. Many mor intrsting rsults xpctd. A.F.Żarncki Elctrowak studis and sarch for nw phnomna at HERA p.25/25