DHEP Seminar February 2, 2012

1. Personal Recollections from Gagan Mohanty DHEP, TIFR DHEP Seminar February 2, 2012 DHEP Seminar July 29, 2013 TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: AAAAAAA

2. Shall roughly follow the sequence given here } Man-made machines • Focus on what I found interesting, detailed at http://www-conf.slac.stanford.edu/lp13

3. Let’s start with QCD } Man-made machines

4. Inclusive jet and dijet measurements H.D. Yoo } Man-made machines • Complimentary to inclusive jet measurement • m12 is the dijet invariant mass and y is half the absolute rapidity difference between the two leading jets • Data and theory are in agreement to ~10% with various PDFs

5. s keeps on running... H.D. Yoo • Ratio of the inclusive 3-jet to inclusive 2-jet cross section (R32) with the average pT of the two leading jets (<pT1,2>) ranging between 0.42 and 1.39 TeV • First determination of s from measurements at a Q value above 0.6 TeV • Good agreement with the world average value of s(mZ) = 0.11840.0007 } Man-made machines • Similar results from ATLAS

6. A text-book plot from CMS      ( NLO and  NNLO) }  Man-made machines            • ATLAS has got a similar story to tell

7. A bit on hadron spectroscopy } Man-made machines

8. C.Z. Yuan What is the X(3872)? Discovered in 2003 • Mass (3871.680.17 MeV): Close toD0D*0threshold • Width (< 1.2 MeV, CL=90%): Narrow • Production • In pp/ppcollisions – rate similar to charmonia • In B decays – KX similar to cc, K*X smaller than cc • Decay BF: open charm ~ 50%, charmonia~ few % • Nature (very likely exotic) • LooselyD0D*0 bound state (like deuteron)? • Mixture of excited c1 andD0D*0 bound state? • Many other possibilities: tetraquarketc.? • Find out JPC assignment out of the remaining two possibilities: 1++ and 2+to pin down its nature (2S) X(3872) M(+J/) –M(J/) [GeV]

9. JPC of the X(3872) is 1++ C.Z. Yuan PRL 110, 222001 (2013) 313  26 • JPC=2+ rejected at 8.2! 9

10. Discovery of a new particle – Zc(3900) C.Z. Yuan e+e  +J/ at Ecm= 4.26 GeV e+e  +J/ from ISR events PRL 110, 252001 (2013) PRL 110, 252002 (2013) • M = 3899.03.64.9 MeV •  = 461020 MeV • 307  48 events • Significance >8 • M = 3894.56.64.5 MeV •  = 632426 MeV • 159  49 events • Significance >5.2 • What is Zc(3900)? Charged and couples to cc at least four-quark configuration • Clearly exotic – tetraquark, DD molecule, cusp… 10

11. Charm, beauty and strange-beauty mesons } Man-made machines

12. Probing CP violation in charm decays } Man-made machines R. Oldeman

13. Is it SM or NP? – a theorist prescription J.F. Kamenik } Man-made machines • RSM is not expected to be greater than 1 for mc >> QCD, but not impossible if we treat the charm-quark to be light • Check:

14. Another enigma: semileptonic asymmetry } Man-made machines • Bottom-line: R. Oldeman

15. Current status of the Unitarity triangle M. Roney } Man-made machines

16. A tantalizing result on B  D() M. Roney PRL 109, 101802 (2012) } Man-made machines Type-II 2HDM BaBar • If the discrepancy with SM holds up, the result cannot be explained by type-II 2HDM; excluded over the full parameter space at 99.8% CL • But can be accommodated in more general extensions of type-III 2HDM

17. Bs+: almost like a litmus test } Man-made machines G. Mancinelli • Highly sensitive to extended Higgs model and MSSM at large tan region

18. First evidence for Bs + G. Mancinelli } Man-made machines • Consistent with the SM expectation (3.28109) • Set an upper limit on BF(B0 +) < 9.41010at 95% confidence level

19. Recently CMS also came with a bang! U. Langenegger at EPS2013 } Man-made machines arXiv:1307.5025[hep-ex]

20. Let’s now go behind the truth! } Man-made machines

21. Why to worry about measuring the top mass? • The top quark decays well before hadronizing, so one can directly measure its mass by reconstructing various decay products • Indeed, top is the most accurately measured quark (better than 0.5%) } • Participates in the quantum loop radiative corrections to the W mass, constraining the Higgs mass (was important till July 2012 discovery) • Now one can use this measurement to assess the self-consistency of SM Man-made machines • The huge mass (almost same as the tungsten atom) puts it close to the scale of EWSB, so the top quark might have a special role in it

22. So far the most sensitive method at LHC A. Castro } Man-made machines

23. LHC average for the top mass A. Castro } Man-made machines • What about Tevatron?

24. An unsettled question from Tevatron • Thanks to pp environment, one can measure the forward-backward asymmetry AFB J. Varela } Man-made machines

25. Story so far from the LHC • Being a pp machine, LHC does not allow to measure AFB; we can however measure the charge asymmetry Ac J. Varela } Man-made machines

26. Another SM candle: W mass • Current WA is dominated by Tevatron and has a precision of 104 B. Quinn } Man-made machines

27. A picture perfect for ILC enthusiasts B. Quinn } Man-made machines

28. Probing BSM with charged leptons S. Mihara Now } Man-made machines • Prohibitively small in SM+mass, so constitutes a clean BSM probe • Great prospect ahead to further pin down cLFV with the MEG upgrade, Mu2e, COMET, Project X and Belle II

29. Neutrino mixing phenomenology S. Pascoli } Man-made machines

30. One of the highlighted results on s: sin2(13) Y.F. Wang } Man-made machines

31. Now to the discovery of the decade! } Man-made machines

32. The decay H → γγ: two approaches A. De Roeck • MVA method is the nominal one while the cut-based approach is there for the cross-check purpose MVA mass-factorized Cut-based Each event category is weighted by its S/(S+B) only for visualization purposes

33. The decay H →ZZ → 4l A. De Roeck Good control of the dominant ZZ background M(4l)>160 GeV Data 380 evts MC 364.5 evts Clean signal peak at ~126 GeV (pp ZZ, 8TeV) = 8.41.0 (stat.)  0.7 (syst.)  0.4(lum.) pb sSM(th) = 7.8  0.6 pb

34. The decay H →WW →2l+2ν A. De Roeck Events with 0 jets and different flavour leptons (7+8 TeV Data) Exclusion at 95% in the mass range 128-600 GeV Large excess (4 observed, 5.1 expected at mH  125 GeV) in the low mass region

35. Summary of the five main channels A. De Roeck For a mass of mH = 125.7 GeV CMS-PAS-HIG-13-005 PLB 716, 30-61 (2012) Current result Discovery paper Expected Observed 3.8  3.2  2.8  4.1  2.4  1.6  1.9  0.7  3.4s 1.4  0.0  bb: includes VH and VBF WW: includes ggF, VH, VBF

36. Mass of the new boson A. De Roeck H ZZ4l:mH= 125.8 ± 0.5 (stat.) ±0.2 (syst.) GeV H γγ:mH= 125.4 ± 0.5 (stat.) ±0.6 (syst.) GeV Signal strength versus mass mH = 125.7 ± 0.3(stat) ± 0.3(syst) GeV = 125.7 ± 0.4 GeV

37. Couplings to fermions and gauge bosons A. De Roeck For mH= 125.7 GeV G(H gg) ~|a kV + b kf|2 a/b = -0.2, GBSM = 0 Contributions from all decay channels Overall result Results within 1σ of the SM prediction

38. What about its spin and parity? A. De Roeck Spin/parity hypothesis tests: H → ZZ → 4l channel Discriminant built to describe the kinematics of production and decay of different JP state of a "Higgs" 0+vs0- CLs=0.16% More JP hypotheses have been tested in a similar way 

39. Latest news on the Higgs from ATLAS K. Jakobs ATLAS-CONF-2013-013 6.6 7.4 } Man-made machines ATLAS-CONF-2012-161 1.1 3.8 • Significances reported in the Discovery paper: 4.5, 3.6 and 2.8 for , ZZ and WW PLB 716, 1-29 (2012)

40. How does the Higgs couple to SM particles? K. Jakobs } Man-made machines

41. Is it a scalar or pseudo-scalar? K. Jakobs } Man-made machines

42. How likely it is a tensor (2+) particle? K. Jakobs } Man-made machines

43. Anything else I found interesting? } Man-made machines

44. C. Galbiati M. Nicola } Man-made machines P. Zuccon P. Privetera 44