1 / 69

30 min condensed version - only select a few topics

Part II- The Structure of the Nucleon and QCD - 3 decades of Experimental investigation 1973-2004 - a personal perspective Arie Bodek , University of Rochester Dept Colloq. Nov. 10, 2004. 30 min condensed version - only select a few topics. Quarks Before QCD/Asymptotic Freedom.

inoke
Download Presentation

30 min condensed version - only select a few topics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Part II- The Structure of the Nucleonand QCD - 3 decades of Experimental investigation 1973-2004 - a personal perspectiveArie Bodek, University of RochesterDept Colloq. Nov. 10, 2004 30 min condensed version - only select a few topics

  2. Quarks Before QCD/Asymptotic Freedom 2005 J. J. Sakurai  Prize in Theoretical  Particle Physics to : Susumu Okubo Professor of Physics University of Rochester (and UR PhD 58’) "For  ground breaking investigations into the pattern of hadronic masses and decay rates, which provided essential clues into the development of the quark model, and for demonstrating that CP Violations permits partial decay rate asymmetries” Related APS Panfosky Prize in Experimental Particle on this topic: 1989 Henry W. Kendall (MIT), Richard E. Taylor (SLAC), and Jerome I. Friedman (MIT)Discovery of Quarks– > Also Nobel Prize 1990 "for their pioneering investigations concerning deep inelastic scattering of electrons on protons and bound neutrons, which have been of essential importance for the development of the quark model in particle physics"

  3. Quarks after QCD 1986 J. J. Sakurai  Prize in Theoretical  Particle Physics to : David Gross (Princeton), H. David Politzer (Caltech), and Frank Wilczek (MIT) - Discovery of QCD –Quark Model – Nobel Prize 2004 DAVID J. GROSS, H. DAVID POLITZER and FRANK WILCZEK “ For the discovery of asymptotic freedom in the theory of the strong interaction” The key discovery was made in 1973, when Politzer, a Harvard University graduate student, Gross from Princeton and his graduate student Wilczek theorized that quarks actually become bound more tightly the farther they get from each other (or less tightly, the closer they get together) Related APS Panfosky Prizes in Experimental Particle on this topic: 1995 Frank J. Sciulli (Columbia University)"For his contribution to a seminal set of high energy neutrino experiments at Fermilab. These experiments played an important role in establishing the existence of weak neutral currents; they established accurate neutrino-nucleon cross sections and accurate values of basic electroweak parameters; they set important limits on neutrino oscillations; and they fit sum rules that helped establish the physical reality of quarks.” 2004 Arie Bodek (University of Rochester)"For his broad, sustained, and insightful contributions to elucidating the structure of the nucleon, using a wide variety of probes, tools and methods at many laboratories.” (my Hobby)

  4. Particle Physics pre -1968 simplistic view Many different models for Hadron Structure. Quarks was considered more of a convenient way to model a symmetry rather than real particles (since none were ever observed and they had strange properties like 1/3 charge. “Real Particle Physics” done in hadron (proton) machines where “Resonances” and new particles were being studied and discovered (spectroscopy, group theory, partial wave analysis, resonances, Regge poles etc. • Short Interlude – quarks “discovered” in electron scattering • Particle Physics post 1973 simplistic view • J/psi-Charm quarks and then Upsilon-Bottom quarks discovered e+e-, p-p “now Real Particle Physics now done at e+e- or hadron machine where new charm and bottom mesons and hadrons are discovered and studied, but now they are made of quarks (spectroscopy, partial wave analysis, resonances etc.). • Particle Physics Now simplistic view - “Real Particle Physics done at e+e- or hadron machine where new particles are NOT discovered (Supersymmetry, Lepto-quarks, Higgs, Heavy Leptons etc).

  5. by 2000: Nucleon Structure is well understood and NNLO QCD works from Q2=1 GeV2 to the highest values currently accessible in hadron colliders. How did we get there? Like the majority of advances in High Energy Physics, progress in this area was accomplished by: Higher Energies (new accelerators and machines) And more importantly in combination with New experimental techniques - Higher PrecisionTo go beyond the Limitations/Brick Walls of old techniques Better understanding (new theoretical tools) Higher Luminosities (more statistics) Different probes (new beams)

  6. Gluons (bosons) =field particles of the color force Quarks (Fermions) - close to massless (MeV range) 1 GeV Mass If you want to be fussy, there are also a few photons from the electromagnetic interaction

  7. Inclusive e + p  e + X scattering Quarks are spin 1/2 Where Virtual photons are spin 1 and have mass =q2. Alternatively:

  8. Inclusive e + p  e + X scattering Single Photon Exchange Resonance Elastic DIS Where At high Q2 -> FL = 0 for spin 1/2 partons (virtual photon has spin 1, leading to a spin helicity flip) Alternatively:

  9. e-P scattering A. Bodek PhD thesis 1972 [ PRD 20, 1471(1979) ] Proton Data Electron Energy = 4.5, 6.5 GeV Data V. Weisskopf * (former faculty member at Rochester and at MIT when he showed these data at an MIT Colloquium in 1971 (* died April 2002 at age 93) Said MIT SLAC e-p DATA 1970 e.g. E0 = 4.5 and 6.5 GeV ‘The Deep Inelastic Region is the“Rutherford Experiment”of the proton. The electron scattering data in the Resonance Region is the“Frank Hertz Experiment”of the Proton. What do The Frank Hertz” and“Rutherford Experiment” of the proton’ have in common? A: Quarks! And QCD

  10. COMPARISONS OF DEEP INELASTIC ep AND en CROSS-SECTIONS AB et al Phys. Rev. Lett. 30: 1087,1973. (SLAC Exp. E49 PhD thesis)-First resultNext Step higher precision • THE RATIO OF DEEP - INELASTIC en TO ep CROSS-SECTIONS IN THE THRESHOLD REGION AB et al Phys.Lett.B51:417,1974 ( SLAC E87) 1968 - SLAC e-p scaling ==> Point like Partons in the nucleon 1970-74 - Neutron/Proton ratio - Partons are fractionally charged (quarks) PRL referees - nothing substantially new over 1973 N =d d u + sea 1/3 1/3 2/3 P = u u d + sea 2/3 2/3 1/3 Large x N/P -> 0.25 Explained by valence d/u PARTONS ARE QUARKS ! [ (1/3) / (2/3)]2 =1/4 Small x : N/P=1 explained by sea quarks F2N F2P Scaling-> Point like PARTONS 2/3 F2P 1/4 1 2 x x

  11. RP 3 R=L/ T (small) quarks are spin 1/2 ! EXTRACTION OF R = L/T FROM DEEP INELASTIC eP AND eD CROSS-SECTIONS. E. Riordan, AB et al Phys.Rev.Lett.33:561,1974. EXPERIMENTAL STUDIES OF THE NEUTRON AND PROTONELECTROMAGNETIC STRUCTURE FUNCTIONS. AB et alPhys.Rev.D20:1471-1552,1979. BUT what is the x and Q2 Dependence of R? What is x, Q2 dependence of u, d, s, c quarks and antiquarks?

  12. 4. Integral of F2(x) =0.5 did not add up to 1.0. Missing momentum attributed to “gluons”. Like Pauli’s missing energy in beta decay attributed to neutrinos*So we also “Discovered” gluons in 1970, much before PETRABUT what is their x Distributions? Or are they only part of a bag? F2P 4 F2N 5. Scatter shows F2(x, Q2) as expected from bremstrahlung of gluons by struck quarks in initial of final states. BUT QCD NOT FULLY FORMALIZED YET F2D 5

  13. 1968-74 - The good (or bad) old days? • Close interactions between theorists and experimentalists ( as a grad student I had lots of interactions with Feynman, Bjorken, Gillman) • Experiment was leading theory in new discoveries • It was the beginning of an era of new discoveries such as quarks in the proton and neutron, QCD, Neutral Currents, new Charm, Bottom, Top quarks, W and Z bosons, Standard Model, Neutrino Oscillations • 1970- Large number of HEP physicists in experiment and theory were leaving the field, no jobs (including most of the graduate students on the SLAC-MIT program)- The field of HEP seemed to have no future. • I also call it the age of the physicist as a Barracuda: 1970 SLAC (Taylor’s group), (Stanford - Hofstader’s elastic electron scattering group), and MIT (Friedman, Kendall) were not on speaking terms with one another - (e.g No MIT student undergrad from the Kendall Friedman group was admitted to Stanford). Stanford and SLAC has a rift etc.

  14. Naive Parton Model - Exact scaling-> point like, non interacting quarks, bound in a bag - 1973 1.Scaling violations only from quark binding effects (Higher Twist, Target mass) go like powers in 1/Q2 - uninteresting 2. Field Theory - QCD scaling violations from gluon emission are logarithmic with Q2 -may or may not be true, need high energies 3. If quarks are not point like -> scaling violations could come from quark radius/form factors. Another layer in the onion-

  15. In 1972, Arie Bodek and Michael Riordan - MIT graduate students, went to Harvard Square to meet with graduate student David Politzer at Harvard, and with postdoc DeRujula. They proposed that we look at the electron scattering data to test for what they called Dogs. They meant dLnQ2 in a new theory called Asymptotic Freedom, which predicted deviations from scaling with logarithmic slopes. Not to be biased by theory - we looked at the data and tested deviations from scaling - (1) Did we understand the radiative corrections? - Friedman (1) Asymptotic Freedom Models predicted Dogs (dLnQ2) , (2) Quark Compositeness Model (quark form factors/radius) (Dipole in Q2) 1/(1+Rq2*Q2)2 (3) Higher Twist (Quark Binding Effects) (1/Q2) - was considered to be uninteresting - but actually very interesting in retrospect.

  16. By that time, there was a paradigm shift among the experimental community -Feynman’s parton model with non-interacting quarks inside a glue bag was the accepted dogma - never mind that there was no field theory that had those properties. Hadrons were now simple. All one had to do is go to high energy and we could predict everything. • Experimental discoveries were expected not to be subtle, but rather obvious and qualitative. People who tried to do precision experiments were just investigating uninteresting low energy effects that were bound to go away at high energy. After all, high energy physics should make things simple. Only nuclear physicists and solid state physicists studied complicate systems for which the fundamental physics was already known. • To continue to get funded need to develop and build new state of art new detectors But as as a hobby I believed (1) Physics is an experimental science and as experimenters, our tasks it to do better and better measurements to address fundamental problems from many different angles (2)Theory needs to go beyond beyond the “back of the envelope state” qualitative stage. (3) If one cannot get experts to do this, one has to do these oneself

  17. Scaling violationsSEEN in 1974, Are they deviations from Parton Model e.g. from “gluon” emission, or are they just at Low Q2 F2P Extracted from Rosenbluth separations • Next Higher Precision: First observation of Scaling Violations SLAC • E. M. Riordan, AB et al TESTS OF SCALING OF THE PROTON ELECTROMAGNETIC STRUCTURE FUNCTIONSPhys.Lett.B52:249,1974(more detail in AB et al Phys.Rev.D20:1471-1552,1979 25 years later in 2000. We show that Higher Twist come from Target Mass + NNLO QCD STUDIES OF HIGHER TWIST AND HIGHER ORDER EFFECTS IN NLO AND NNLO QCD ANALYSIS AB, UK Yang. Eur. Phys. J. C13 (2000) 241 245. 1974: PRL Referees - obviously these are uninteresting low Q2 effects

  18. "Physics is generally paced by technology and not by the physical laws. We always seem to ask more questions than we have tools to answer. Wolfgang K. H. Panofsky • Questions in 1972-2000 Anti-quarks,strange , charm quarks in nucleons , individual PDFs(u,d,qbar,gluonsQ2,x dependence)R=longitudinal structure function (x,Q2), quarks in nuclei , origin of scaling violations- low Q2 higher twist or QCD?, • A Detailed understanding of Nucleon Structure Required Initiating Measurements at Different Laboratories, New Detectors, New Analysis Techniques and Theoretical Tools - AND also sorting out which experiments are right and which experiments are wrong - incremental but steady progress. Meanwhile: the J/Psi was discovered in 1974 --->and the age of Spectroscopy returned; and then came the Upsilon and there was more spectroscopy to be done. - but a few people continued to study the nucleon.

  19. How are Parton Distributions (PDFs) Extract from various data at large momentum transfer (e// and other expts.) PDF(x)= Valence and sea H and D d/u Also Drell Yan, jets etc

  20. Caltech (->Columbia)- Chicago - Fermilab - Rochester -(Wisconsin) • The CCFR(W)-NuTeV Neutrino Collaboration at Fermilab Lab E (1974-2004) - separate quark and antiquark distributions, Valence and Sea • Barish, Sciulli, Shaevitz, Fisk, Smith,Merritt, Bernstein, McFarland and others) • . • Budd, deBarbaro Sakumoto • Rochester Senior Scientists First day- How dare you write that paper on scaling violation V-A Weak Interaction => difference between quarks and anti-quarks (Neutrinos are left handed and antineutrinos right handed)

  21. Neutrino physics is information rich- nucleon structure is just one by-product NC- Electroweak New discovery CC- quarks antiquarks, PDFs and QCD dimuons- Charm -new discovery and Strange quarks What people hoped for was to discover the W boson (at 15 GeV) and new heavy leptons (these were not discovered in neutrino beams)

  22. Neutrino Experiments REQUIRE good Hadron Calorimetry and Muon Energy calibration (~0.3%) 10 cm Fe Sampling, NuTeV simultaneous neutrino running and hadron and muon test beams D.A. Harris (Rochester), J. Yu et al NuTeV PRECISION CALIBRATION OF THE NUTEV CALORIMETER. UR-1561 Nucl. Inst. Meth. A447 (2000) W.K. Sakumoto(Rochester), et al. CCFR CALIBRATION OF THE CCFR TARGET CALORIMETER.Nucl.Instrum.Meth. A294:179-192,1990. CCFR Developed Fe-scintillator compensating calorimeter. 3mx3m large counters with wavelength shifting readout

  23. Dimuon event C: Strange Quarks in the Nucleon - Caltech-Fermilab --> CCFR (Columbia -Chicago-Fermilab-Rochester) and -Later- NuTeV Neutrino Collaborations at Fermilab LAB E. K The Strange SeaAnti-quarks are about 1/2 of the average of u and d sea - i.e Not SU3 Symmetric. Karol Lang, AN EXPERIMENTAL STUDY OFDIMUONS PRODUCED IN HIGH-ENERGY NEUTRINO INTERACTIONS.UR-908 (1985)Ph.D. Thesis (Rochester) Now Professor at UT Austin Most recently M.Goncharov and D. Mason (NuTeV PhDs)

  24. Precision High Statistics Neutrino Experiments at Fermilab - Valence, Sea, Scaling Violations, gluons F2 xF3 , Precise sGLS sum rule (Q2 dependence) GLS( q2) dependence s W.G. Seligman et al. (CCFR Columbia PhD),IMPROVED DETERMINATION OF S FROM NEUTRINO NUCLEON SCATTERING. Phys. Rev. Lett. 79 1213 (1997) H. Kim (CCFR Columbia PhD); D.Harris (Rochester) et. al.MEASUREMENT OFS (Q2) FROM THE GROSS- LLEWELLYN SMITH SUM RULE.Phys. Rev. Lett. 81, 3595 (1998)

  25. Precision Neutrino Experiments CCFR/NuTeV Un Ki Yang UR-1583,2000 Ph.D. Thesis, (Rochester) Lobkowicz Prize, U of R; URA Best Thesis Award Fermilab 2001 (now at Univ. of Chicago) Un-Ki Yang et al..MEASUREMENTS OF F2 AND XF3 FROM CCFR -FE DATA IN A PHYSICS MODEL INDEPENDENT WAY. By CCFR/NuTeV Phys.Rev.Lett.86, 2742,2001 Same PDFs should describe all processes Resolved 10% to 20% difference between  and  data Experiment vs Theory: Ratio of F2 (neutrino)/F2 (muon)

  26. D Quark Distributions in Nuclei - New Parallel Program at SLAC AB, J Ritchie FERMI MOTION EFFECTS IN DEEP INELASTIC LEPTON SCATTERING FROM NUCLEAR TARGETS, Phys.Rev.D23:1070,1981; Phys.Rev.D24:1400,1981. 1983 (conference proceeding) surprising report of difference between Iron and Deuterium muon scattering data from the European Muon Collaboration (EMC) Disagreement with Fermi Motion Models. Physics Archeology - Use 12 and 13 year old SLAC Empty target data to check on this AB, EMPTY TARGET SUBTRACTIONS AND RADIATIVE CORRECTIONS IN ELECTRON SCATTERING EXPERIMENTS, Nucl. Inst. Meth. 109 (1973). - factor of 6 increase in rate of empty target data by making empty target same radiation length as H2 and D2 targets; - used in SLAC E87 - more payoff later ELECTRON SCATTERING FROM NUCLEAR TARGETS AND QUARK DISTRIBUTIONS IN NUCLEI. AB et al Phys.Rev.Lett.50:1431,1983.. - Use Empty Target Data from SLAC E87(1972)(initially rejected by Phys. Rev, Letters) IRON A COMPARISON OF THE DEEP INELASTIC STRUCTURE FUNCTIONS OF DEUTERIUM AND ALUMINUM NUCLEI. AB et al Phys.Rev.Lett.51:534,1983. Use empty target data from SLAC E49B(1970) ALUMINUM

  27. Quark Distributions in NucleiAB et al Phys. Rev. Lett. 51: 534, 1983 (SLAC Expt. E49, E87 empty tgt data 1970,1972) EMC PRL Referees: (1) How can they claim that there are quarks in nuclei + (2) Obviously uninteresting multiple scattering of electrons in a nucleus- --> later accepted by PRL editors.

  28. 1983: The field of quark distributions in nuclei hit a brick wall: The issues: (1) Precise Values and Kinematic dependence of R needed to extract F2 from all electron muon and neutrino experiments. (2) Precise normalization of F2 needed to establish normalization of PDFs for all DIS experiments to 1%. Solution-->SLAC E140 - SLAC E140, E140x - . New Precision Measurement of R and F2, and Re-Analysis of all SLAC DIS data to obtain 1% precision. New hardware, new theoretical tools 1 month run worth years of data, IMPACT all DIS Experiments Past and Future. Upgrade Cerenkov Counter for ESA 8 GeV spectrometer - N2 with wavelength shifter on phototube Upgrade Shower Counter from lead-acrylic (to segmented lead glass) Upgraded tracking (wire chambers instead of scintillator-hodoscope) Upgraded Radiative Corrections - Improved treatment using Bardin, Complete Mo-Tsai, test with different r.l. targets ( to 0.5%) Cross normalize all previous SLAC experiment to SLAC E140 by taking data in overlap regions.(Re-analysis with upgraded rad corr).

  29. Sridhara Rao Dasu,PRECISION MEASUREMENT OF X, Q2 AND • A-DEPENDENCE OFR = L/T AND F2 IN DEEP INELASTIC • SCATTERING. UR-1059 (Apr 1988) . Ph.D. Thesis. (Rochester) • SLAC E140 - winner of the Dexter Prize U of Rochester 1988 • (now on the faculty at U. Wisconsin, Madison) • S. Dasu(Rochester PhD )et al.,MEASUREMENT OF THE • DIFFERENCE IN R = L/T, andA/D IN DEEP INELASTIC • ed, eFE AND eAuSCATTERING. Phys.Rev.Lett.60:2591,1988; • S. Dasu et al., PRECISION MEASUREMENT OF R = L/T AND F2 IN DEEP INELASTIC ELECTRON SCATTERING. Phys.Rev.Lett.61:1061,1988; • S. Dasu et al., MEASUREMENT OF KINEMATIC AND NUCLEAR DEPENDENCE OF R = L/TINDEEP INELASTIC ELECTRON SCATTERING.Phys.Rev.D49:5641-5670,1994. • L.H. Tao (American U PhD) et al., PRECISION MEASUREMENT OF R = L/T ON HYDROGEN, DEUTERIUM AND BERYLLIUMTARGETS IN DEEP INELASTIC ELECTRON SCATTERING. Z.Phys.C70:387,1996 • L.W. Whitlow (Stanford PhD), et al. ,A PRECISE EXTRACTION OF R = L/T FROM A GLOBAL ANALYSIS OF THE SLAC DEEP INELASTIC ep AND ed SCATTERING CROSS-SECTIONS.Phys.Lett.B250:193-198,1990. • L.W. Whitlow, et. al., PRECISE MEASUREMENTS OF THE PROTON AND DEUTERON STRUCTURE FUNCTIONS FROM A GLOBAL ANALYSIS OF THE SLAC DEEP INELASTIC ELECTRON SCATTERING CROSS-SECTIONS. Phys.Lett.B282:475-482,1992.

  30. 1992: Provided normalization and shape at lower Q2 for all DIS experiments- constrain systematic errors on higher energy muon experiments - Perturbative QCD with/ without target mass (TM) effects

  31. F: Phenomenology: PUTTING it ALL TOGETHER The Great Triumph of NNLO QCD Origin of Higher Twist Effects, d/u and PDFs at large X – (1992-2000) NNLO QCD +target mass corrections describes all of DIS data for Q2>1 GeV2 with NO Need for Higher Twists. GREAT TRIUMPH for QCD . Most of what was called low Q2 higher Twist are accounted for by higher order QCD. PARTON DISTRIBUTIONS, D/U, AND HIGHER TWIST EFFECTS AT HIGH X. AB, UK YangPhys.Rev.Lett.82:2467-2470,1999. STUDIES OF HIGHER TWIST AND HIGHER ORDER EFFECTS IN NLO AND NNLO QCD ANALYSIS OF LEPTON NUCLEON SCATTERING DATA ON F(2) AND R = (L) / (T). AB, UK YangEur.Phys.J.C13:241-245,2000

  32. NNLO QCD+Tgt Mass works very well for Q2>1 GeV2 NNLO QCD+TM blackGreat Triumph of NNLO QCD. AB, UK YangEur.Phys.J.C13:241-245,2000 Size of the higher twist effect with NNLO analysis is very small a2= -0.009 (in NNLO) versus –0.1( in NLO) - > factor of 10 smaller, a4 nonzero F2P R F2D

  33. Great Triumph of NNLO QCD. AB, UK YangEur.Phys.J .C13:24,2000 First extraction of (NNLO PDFs)/(NLO PDFs) ratio Low x NNLO PDFs 2% higher than NLO PDFs High x NNLO PDFs 10% lower than NLO PDFs For High Statistics Hardon Collider Physics (run II, LHC), the next step is to extract NNLO PDFs. So declare victory and let theorists and PDF Professionals (MRST and CTEQ) make progress towards the next generation NNLO PDF fits for Tevatron and LHC

  34. Proton-Antiproton (CDF/Dzero) collisions are actually parton-parton collisions (free nucleons) Measure W mass from Transverse mass of electrons from W decays W->electron-neutrino

  35. e+e--->2 quark jets at LEP Some people need to see in order to believing e+e---> quark jet +antiquark jet + gluon jet 1979 A Special European Physical Society (EPS) Prize has been awarded by the EPS Executive Committee to the JADE, MARK-J, PLUTO, and TASSO Collaborations,Deutsches Elektronen-Synchrotron (DESY), Hamburg, each responsible for one of the four detectors at DESY's PETRA collider whose results independently confirmed the gluon's existence. 3-jet events'' such as shown here, where three narrow bundles of particles (jets) emerge from the electron-positron collision, proved the existence of the gluon (This event was observed by JADE).

  36. The 1995 High-Energy and Particle Physics Prize of EPS The Prize Committee of the High-Energy and Particle Physics Division of the European Physical Society (EPS) announces that the 1995 High-Energy and Particle Physics Prize of EPS has been awarded jointly to: Paul Söding, DESY - Institute of High-Energy Physics, Zeuthen Björn Wiik, Deutsches Elektronen-Synchrotron (DESY), Hamburg Günther Wolf, DESY, Hamburg Sau Lan Wu, University of Wisconsin, Madison, Wisconsin, USA. for "the first evidence for three-jet events in e+e- collisions at PETRA"

  37. http://eps-hepp.web.cern.ch/eps-hepp/Prizes/hepp-eps.html EUROPEAN PHYSICAL SOCIETY THE HIGH ENERGY AND PARTICLE PHYSICS PRIZES 2003 D.J. GROSS, H.DAVID POLITZER, F. WILCZEK, For their fundamental contributions to Quantum chromodynamics, the theory of strong interactions. By demonstrating that the theory is asymptotically free, that the couplings become weak at large momentum transfers, they paved the way for showing that the theory is correct. 2001 D. PERKINS, For his outstanding contributions to Neutrino Physics and for implementing the use of Neutrinos as a tool to elucidate the Quark Structure on the Nucleon. 1999 G. 'T HOOFT, For pioneering contributions to the renormalization of non-abelian gauge theories including the non-perturbative aspects of these theories. 1997 R. BROUT, F. ENGLERT, R. W. HIGGS, For formulating for the first time a self-consistent theory of charged massive vector bosons which became the foundation of the electroweak theory of elementary particles. 1995 P. SODING, B. WLIK, G. WOLF, S. L. WU, For the first evidence for three-jet events in e+e collisions at PETRA. 1993 M. VELTMAN, For the role of massive Yang-Mills theories for weak interactions. 1991 N. CABIBBO, For the theory of weak interactions leading to the concept of quark mixing. 1989 G. CHARPAK, For the development of detectors: multiwire proportional chambers, drift chambers and several other gaseous detectors, and their applications in other fields.

  38. Also thanks to many Collaborators over the past 3.5 decades +FUTURE ( Blue awarded Panofsky Prize) • The Electron Scattering SLAC-MIT collaboration at SLAC End Station A (E49, E87) with Kendall, Friedman, Taylor, Coward, Breidenbach, Riordan, Elias, Atwood& others (1967-1973) • The Electron Scattering E139, E140, E140x, NE8 collaboration at SLAC ESA/ NPAS injector at SLAC (with Rock, Arnold, Bosted, Phillipone, Giokaris & others) (1983-1993) • The E379/E595 Hadronic Charm:with Barish, Wojcicki, Merrit. Fisk, Shaevitz& others) Production collaboration at Fermilab labE(1974-83) • The AMY e+e- Collaboration at TRISTAN/KEK (with Steve Olsen& others) (1982-1990) • The CCFR(W)-NuTeV Neutrino Collaboration at Fermilab Lab E (with(1974-2004)Barish, Sciulli, Shaevitz, Fisk, Smith,Merritt, Bernstein, McFarland and others) • The CDF proton-antiproton Collaboration at Fermilab (1988- • And in particular I thank the graduate students and 2004) • postdocs over the years, and Rochester Senior ScientistsBudd, deBarbaro Sakumoto. • +more progress to be made with collaborators at the CMS-LHC experiment,(1995-->) • The New Electron Scattering JUPITER Collaboration at • Jefferson Lab,& the new MINERvA Neutrino (1993--> • Collaboration at Fermilab(McFarland, Morfin, Keppel, Manly),

  39. Current Status of Unpolarised SFs From Bodek (2000) Overall, F2 is well measured over 4 orders of magnitude,

  40. D. Back to SLAC using High Energy Beam and the Nuclear Physics Injector NPAS - SLAC E139, E140, E140x, E141, NE8 • R.G. Arnold et al.,MEASUREMENTS OF THE A-DEPENDENCE OF DEEP INELASTIC ELECTRON SCATTERING FROM NUCLEIPhys. Rev. Lett.52:727,1984; • (initial results incorrect by 1% since two photon external radiative corrections for thick targets not initially accounted for. Found out later in SLAC E140) • J. Gomez et al., MEASUREMENT OF THE A-DEPENDENCE OF DEEP INELASTIC ELECTRON SCATTERING. Phys.Rev.D49:4348-4372,1994. Back to SLAC End Station A to measure effect on various nuclei

  41. SLAC E140 and the combined SLAC re-analysis provided the first precise values and kinematic dependence of R Related to F2/2xF1 for use by all DIS experiments to extract F2 from differential cross section data R

  42. Proton-Antiproton (CDF/Dzero) collisions are actually parton-parton collisions (free nucleons) Measure W mass from Transverse mass of electrons from W decays W->electron-neutrino

  43. In 1994 uncertainties in d/u from deuteron binding effects contributed to an uncertainty in the W mass (extracted from CDF or Dzero Data of order 75 MeV. ANOTHER BRICK Wall This is why it is important to know the nuclear corrections for PDFs extracted from nucleons bound in Fe (neutrino) or in Deuterium (d versus u), when the PDFs are used to extract information from collider data Proton-Antiproton (CDF/Dzero) collisions are actually parton-parton collisions (free nucleons) By introducing new techniques, CDF data can provide independent constraints on free nucleon PDFs. CONSTRAINTS ON PDFS FROM W AND Z RAPIDITY DIST. AT CDF. AB, Nucl. Phys. B, Proc. Suppl. 79 (1999) 136-138. In *Zeuthen 1999, Deep inelastic scattering and QCD* 136-138.

  44. E: Proton-Antiproton (CDF/Dzero) collisions are actually parton-parton collisions (free nucleons)

  45. Proton-antiproton collisions (CDF)- Measurement of d/u in the proton by using the W+- Asymmetry Mark Dickson,THE CHARGE ASYMMETRY IN W BOSON DECAYS PRODUCED IN P ANTI-P COLLISIONS. (1994) Ph.D.Thesis (Rochester). (now at MIT Lincoln Labs) Qun Fan, A MEASUREMENT OF THE CHARGE ASYMMETRY IN W DECAYS PRODUCED IN P ANTI-P COLLISIONS. Ph.D.Thesis (Rochester 1996) (now at KLA-Tenor

  46. Need to measure the W Decay lepton Asymmetry at high rapidity where there is no central tracking Unfortunately W’s decay to electrons and neutrinos - Decay lepton asymmetry is a convolution of the W production Asymmetry

  47. A NEW TECHNIQUE FOR DETERMINING CHARGE AND MOMENTUM OF ELECTRONS AND POSITRONS USING CALORIMETRY AND SILICON TRACKING. AB and Q. Fan In *Frascati 1996, Calorimetry in HEP*553- 560 (First used in AMY) Use silicon vertex detector to extrapolate electron track to the forward shower counters.Compare the extrapolated location to the centroid of the EM shower in a segmented shower counter. Energy of electron determined by the shower counter, Sign is determined by investigating if the shower centeroid is to the left or right of the extrapolated track, All hadron collider physics (Tevatron, LHC) with electrons and positrons can be done better without a central tracker . No Track mis-ID Need Just silicon tracking and segmented EM +HAD calorimetry -Adapted by CMS-LHC

  48. The d/u ratio in standard PDFs found to be incorrect. Now all new PDF fits include CDF W Asymmetry as a constraint. PDF error on W mass reduced to 10 MeV by using current CDF data.

  49. Knowledge of high x PDF is used as input to searches for new Z’ bosons in high-mass Drell-Yan cross sections and Forward-Backward Asymmetry (another use of forward tracking of electrons) Arie Bodek and Ulrich Baur IMPLICATIONS OF A 300-GEV/C TO 500-GEV/C Z-PRIME BOSON ON P ANTIP COLLIDER DATA AT 1.8-TEV. Eur.Phys.J.C21:607-611,2001 . T. Affolder et al.(CDF)Measurement of d / dM and forward backward charge asymmetry for high mass Drell-Yan e+ e- pairs from p anti-p collisions at 1.8-TeV.Phys.Rev.Lett.87:131802,2001

More Related