XLII Rencontres de Moriond QCD and High Energy Hadronic Interactions March 2007

1. XLII Rencontres de Moriond QCD and High Energy Hadronic Interactions March 2007 Experimental Summary Gigi Rolandi CERN PH gigi.rolandi@cern.ch

2. Logged 710 fb-1 Logged 410 fb-1 Colliders&Colliders HERA TEVATRON BES@BEPC CLEO@CESR KLOE@DAPHNE RHIC SPS BABAR@PEP-II BELLE@KEKb Gigi Rolandi / CERN PH

3. Many many beautiful talks ! Gigi Rolandi / CERN PH

4. …… Impossible to make a “summary” ( less than 1 min/talk !) • Choice of the topics based on my ignorance and my taste • Personal bias • Electroweak • Higgs and single top • Unitarity triangle • D0-D0bar Mixing • Extras • No names will be mentioned …. Only Collaborations Gigi Rolandi / CERN PH

5. BsK+p- CDF SVT Trigger Angular Correlation of charm pairs B0 7000 Signal events S/B  8.3 at the peak Bs Direct CP Asymmetry Gigi Rolandi / CERN PH

6. CLEO Q=340MeV M(D0) reduced 0.2*PDG Measure yelds of double tag and single tag events . BRs extracted in a global 2 fit. 26 M (2s) c0 --> KK Gigi Rolandi / CERN PH

7. Large gluon content Diffractive PDFs are not universal Factorization broken at Tevatron Diffraction and pQDC@NLO x=xip* Gigi Rolandi / CERN PH

8. Dijet e(±)p scattering CDF  + jet ep-->ccX (ep--> D*X) ep-->bbX Dijet b-bbar DIS is well described by pQCD@NLO Gigi Rolandi / CERN PH

9. Will LHC see saturation at very forward rapidities : x ~ 10-6 ? Gluon content of the proton Are the PDFs usable in the LHC kinematic range (1 > x > 10-6) ? Higher-order terms are important at low Q2, low x Gigi Rolandi / CERN PH

10. STAR, Phys Rev Lett 91, 072304 Heavy Ions @ RHIC Pseudo Rapidity dependence Jet quenching in Central Collisions Elliptic flow Gigi Rolandi / CERN PH

11. Precise Measurements of W mass and Top Which top mass are we measuring ? Gigi Rolandi / CERN PH

12. March 2007, LEP EW WG NEW! • Preferred value: mH = 76 GeV at minimum • Upper limit: mH < 144 GeV Electroweak Fit Gigi Rolandi / CERN PH

13. Evolution of EW FIT Gigi Rolandi / CERN PH

14. Evolution of Mtop and MW Gigi Rolandi / CERN PH

15. Mw-Mtop and MSSM George Weiglein Gigi Rolandi / CERN PH

16. SM Higgs Production at LHC Tevatron SM Higgs Production X-section TeV/LHC Gigi Rolandi / CERN PH

17. Channels in Higgs Search Significance 30 fb-1 Tevatron ATLAS CMS Very small rate : concentrate on channels with high Higgs Br Large Rate: signals with smaller BR Atlas : qqH--> qqWW, qq Atlas: H-->ZZ,WW, CMS: H-->  , ZZ, WW CMS: qqH--> qq,qq Gigi Rolandi / CERN PH

18. LHC Number of Events in 1 fb-1 Tevatron CMS Gigi Rolandi / CERN PH

19. Watch at the excess SM Higgs at the Tevatron   not included in the plot How To Extrapolate to 8 fb-1 ? Gigi Rolandi / CERN PH

20. Preliminary First Evidence of Single Top ….seen by D0. CDF has no evidence. Situation pretty complex but not unusual for first evidence. (D0) = 1.5+/- 0.4 (SM) also this not unusual Gigi Rolandi / CERN PH

21. Single Top and Higgs Search In 1 fb-1 D0 Single Top CDF ZZ--> ll Gigi Rolandi / CERN PH

22. Higgs in MSSM Amplitude is ~tanb, hence the cross section is enhanced as tan2b CDF search in h-->ejet D0 see a deficit in the same mass region CDF search in double leptonic channel not conclusive Gigi Rolandi / CERN PH

23. Exclusive di-jet x-section at Tevatron Calibrate scale of predictions Relevant for pp-->ppH Gigi Rolandi / CERN PH

24. 100 fb-1 Diffractive Higgs @ LHC The diffractive production of the Higgs pp-->pHp opens the possibility to measure its quantum numbers and its mass with high precision exploiting the measurement of the outgoing protons momenta in the roman pots. • X-sections O(1fb) --> Large Luminosities • Pile up in coincidence with di-jet production is an overwhelming source of background • To resolve different interactions in the same bunch crossing one needs a time coincidence between the two protons at the level of 3mm i.e. 10 ps Gigi Rolandi / CERN PH

25. HF Physics:Unitarity Triangle radiative decays Xsg,Xdg, Xsll B pp, rp, rr... theo. clean ? B DK +other charmonium Charm Physics (Dalitz) Gigi Rolandi / CERN PH +from Penguins

26. b c J/y c B0d s K0 d d ~ g ~ ~ s b s b New Physics contribution (2-3 families) W- s b f t s B0d s K0 d d New Measurements of sin2 Gigi Rolandi / CERN PH

27. Precise Measurement of ms After LEP and D0….. With Neural Net Selection and same side tagging md --> 1% - ms --> 0.7% -  Gigi Rolandi / CERN PH

28. Progress on Vub B Xu l n B p l n Inclusive : stability in extrapolation to full phase space Exclusive :measurement of form factors Gigi Rolandi / CERN PH

29. Dms IS THIS CONSISTENT ? sin2b=0.53±0.05 From direct measurement Naïve average b--> qqs sin2b=0.68±0.03 From direct measurement b--> ccs sin2b =0.76± 0.04 from indirect determination (all included but sin2b) Gigi Rolandi / CERN PH

30. IS THIS CONSISTENT ? sin2b=0.53±0.05 From direct measurement Naïve average b--> qqs Naïve average of measurement affected by penguins in a different way…. sin2b=0.68±0.03 From direct measurement b--> ccs Experimentally robust, but measures 2(SM+NP) sin2b =0.76± 0.04 from indirect determination (all included but sin2b) Robust: Dominated by Vub, SM tree level, non dependent on NP Gigi Rolandi / CERN PH

31. DCS decays Interference “Oscillations” Mixing in D0 -D0bar system ObservedBaBar Strong phase 3.9  No mixing 2=24 - Mixing+resolution from likelihood fit 2=1.5 Gigi Rolandi / CERN PH

32. Evidence for D0 -D0bar MixingBelle Time dependent analysis of Dalitz plot Lifetime difference Gigi Rolandi / CERN PH

33. y’/10-2 stat. only BaBar 1 BaBar 2 x’2/10-2 Ciuchini et al hep-ph/0703204 BaBar 3 (0,0) =-38o±46o Belle 2 statistical D0 -D0bar Mixing: Comparison Gigi Rolandi / CERN PH

34. Platone Aristotele Is Bayesian approach biasing ? Gigi Rolandi / CERN PH

35. Is Bayesian approach biasing ? hep-ph/0701204 hep-ph/0607246 Bayesian Frequentist My cent: use frequentist approach if you can. It is correct. In many cases it is not-practical…. Then use Bayesian approach and common sense . And show the relevance of the assumptions on the Prior Probability. Gigi Rolandi / CERN PH

36. Conclusions • Very large samples of data are available allowing precise measurements and studies of rare phenomena • I have been impressed by the quality (and the complexity) of the analyses that have been presented • The steady progress in the field is marked by discoveries of new expected phenomena that have been recently seen: DDbar mixing, Single top, ZZ • QCD is - generally speaking - in good shape and describes well the hadron production at high and low Q2 • This accurate description requires a monumental effort both on theory and experimentation and is needed for the searches of new physics at hadron colliders and at lower energy • Everybody is waiting for the start of LHC. It is close. At Moriond XLIV we will see the first presentations with data, but it will take time to understand the detectors • In the mean time watch the Tevatron, the Triangle and the rest…. The devil is in the details of experiments and theory Gigi Rolandi / CERN PH

37. Thanks • To Tran for the 42 Moriond that he invented for us • To the organizers for a well organized conference • To all the speakers for their very good talks Gigi Rolandi / CERN PH