2011 QCD and High Energy Interactions - Rencontres de Moriond ...

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min 2 - 2 20 15 10 5 0 H1 and ZEUS (prel.) HERAPDF1.5f HERAPDF1.6 0.114 0.116 0.118 0.12 0.122 0.124 0.126 (M Figure 2: On the left hand side: the gluon distribution from the HERAPDF sets (based on HERA I only - HERAPDF1.0, and based on HERA I+II, HERAPDF1.5) to MSTW08 at NNLO in the high x region. On the right hand side: the ∆χ 2 distribution as a function of the value of αS(MZ) in the PDF fits for HERAPDF1.5f (dashed line) without jet data and HERAPDF1.6 (solid line) with jet data. xf 1 0.8 0.6 0.4 0.2 0 -4 10 H1 and ZEUS HERA I+II PDF Fit xg ( × 0.05) xS ( × 0.05) -3 10 HERAPDF1.5f (prel.) free s (M ) Z exp. uncert. model uncert. parametrization uncert. -2 10 2 2 Q = 10 GeV xuv xdv -1 10 1 x HERAPDF Structure Function Working Group March 2011 xf 1 0.8 0.6 0.4 0.2 0 -4 10 xg ( × 0.05) xS ( × 0.05) -3 10 HERAPDF1.6 (prel.) free s (M ) Z exp. uncert. model uncert. parametrization uncert. -2 10 S 2 2 Q = 10 GeV xu v xd v ) Z H1 and ZEUS HERA I+II PDF Fit with Jets HERAPDF Structure Function Working Group March 2011 -1 10 1 Figure 3: Summary plot for HERAPDF1.5f (left) and HERAPDF1.6 (right) as a function of x for Q 2 = 10 GeV 2 . The strong coupling constant αS(MZ) is a free parameter in both fits. The central values of the PDFs (solid lines) are shown together with the experimental, model and parametrisation uncertainties represented by the red, yellow and green shaded bands, respectively. References 1. H1 and ZEUS Collaborations, F. Aaron et al., JHEP 1001(2010) 109, arXiv:0911.0884. 2. H1 Collaboration, F. Aaron et al., Eur. Phys. J. C67 (2010) 1, arXiv:0911.5678. 3. H1 Collaboration, F. Aaron et al., Eur. Phys. J.C65(2010) 363, arXiv:0904.3870. 4. ZEUS Collaboration, S.Chekanovetal et al., Physics Letters B547 (2002) 164. 5. ZEUS Collaboration, S.Chekanovetal et al., Nuclear Physics B765 (2007) 1. 6. QCDNUM package, M. Botje, (2010), arXiv:1005.1481. 7. R. S. Thorne code, revised in 2008. 8. V. Radescu slides, http://moriond.in2p3.fr/QCD/2011/MondayMorning/Radescu.pdf 9. The LHAPDF grid files are located at https://www.desy.de/h1zeus/combined results/index.php?do=proton structure x HERAPDF Structure Function Working Group March 2011
Higgs Boson Searches at CMS and ATLAS W. Quayle on behalf of the ATLAS and CMS Collaborations University of Wisconsin-Madison, 1150 University Ave., Madison, WI, 53706 Searches for Higgs bosons decaying to a variety of final states have been performed with the CMS and ATLAS detectors in 35-38 pb −1 of proton-proton collisions at the LHC. No evidence of a Higgs boson is found, and limits are set on the production rates as functions of mass and, for some channels, other model parameters. The strongest constraints come from the H → WW → ℓνℓν channel, where both ATLAS and CMS independently exclude Higgs boson production with a rate of 2.1 times the Standard Model prediction for a Higgs boson with mH = 160 GeV. Projections of the expected sensitivity with higher luminosity show that both experiments expect to exclude a Standard Model Higgs boson in the mass range 130 < mH < 460 GeV with 1 fb −1 of integrated luminosity. 1 Introduction The search for the Higgs boson 1,2,3 is one of the central goals of the LHC scientific programme. Direct searches at LEP 4 and Tevatron 5 have excluded the existence of a Standard Model Higgs boson below 114.4 GeV and in the range 158 < mH < 173 GeV, respectively. Searches for the Higgs boson have recently been performed by the ATLAS 6 and CMS 7 experiments in the √ s = 7 TeV pp collision data recorded during the LHC run of 2010, and the limits set by these searches are summarized below. 2 H → WW (∗) → ℓνℓν and H → ZZ → ℓℓνν/ℓℓqq For mH > 137 GeV, the dominant decay mode of the Standard Model Higgs boson is H → WW 8 . The analysis performed by ATLAS 9 is based on straight cuts on kinematic variables and includes contributions from H + 0j, H + 1j, and H + 2j events. The analysis performed by CMS 10 focuses on H + 0j events, but makes use of a Boosted Decision Tree algorithm to enhance the discrimination between signal and background. Both searches make heavy use of control samples to extract estimates of the rate of backgrounds from WW, top, W+jets, and Z+jets. The W+jets background is normalized using events selected by loosening the lepton selection criteria. The top background control samples are based on altered cuts on jets and b-tagging. A pure Z+jets control sample is constructed by altering the cuts on mℓℓ and E miss T , and the diboson control sample is defined by altered cuts on mℓℓ and transverse opening angle ∆φℓℓ. Figure 1 shows the limits set by ATLAS (left) and CMS (right). Both experiments set limits of around 2.1 times the Standard Model prediction at mH = 160 GeV. The second-dominant decay mode of the Standard Model Higgs boson in the high-mass region is H → ZZ. The H → ZZ → 4ℓ channel is the cleanest signature, but its branching ratio is so small that in 35 pb −1 no 4ℓ candidates events were observed in ATLAS, and only one was observed in CMS. The branching ratios for ZZ → ℓℓνν and ZZ → ℓℓqq are large enough
Page 1 and 2: 2011 QCD and High Energy Interactio
Page 3 and 4: Proceedings of the XLVIth RENCONTRE
Page 5 and 6: 2011 RENCONTRES DE MORIOND The XLVI
Page 7 and 8: Foreword Contents 1. Higgs Searches
Page 9: 1. Higgs
Page 12 and 13: 95% CL Limit/SM 10 1 Tevatron Run I
Page 14 and 15: Events/5 GeV 6 10 5 10 4 10 3 10 2
Page 16 and 17: Events / 0.5 CDF Run II Preliminary
Page 18 and 19: For the most sensitive sub-channel
Page 20 and 21: Table 1: Table listing the various
Page 22 and 23: various SM Higgs mass hypotheses. T
Page 24 and 25: constraints on parameters are given
Page 26 and 27: Figure 2: Invariant mass of the ele
Page 28 and 29: Figure 4: CDF Exclusion limits for
Page 30 and 31: Table 1: Main phases of 2010 commis
Page 32 and 33: Table 4: Parameter list for early (
Page 34 and 35: luminosity of 1.2×10 33 cm −2 s
Page 36 and 37: 2 QCD Analysis settings HERA PDFs a
Page 40 and 41: SM σ / σ 95% CL Limit on 3 10 2 1
Page 42 and 43: NNLO σ/ σSM 95% CL Upper Bound on
Page 44 and 45: the report of this working group. I
Page 46 and 47: 2.3 The impact of different PDF par
Page 49 and 50: SUSY Searches at the Tevatron Ph. G
Page 51 and 52: on the quality (loose or tight) and
Page 53 and 54: SUSY searches at ATLAS N. Barlow, o
Page 55 and 56: channel. These results are combined
Page 57 and 58: Figure 2: The top left plot shows t
Page 59: 2010 data. Analysis techniques for
Page 62 and 63: as main discriminator between event
Page 64 and 65: sign leptons is particularly intere
Page 66 and 67: N of events 5 10 DATA 10 4 3 10 10
Page 68 and 69: ) [pb] ν e → B(W’ × σ 10 1 -
Page 70 and 71: 2 Searches in the dijet final state
Page 72 and 73: ing that the neutrinos were the onl
Page 75 and 76: The Quasi-Classical Model in SU(N)
Page 77 and 78: g (γ µ kµ) γ µ Aa µ g (pk)
Page 79: 3. Top
Page 82 and 83: of their vertex with respect to the
Page 84 and 85: of about 9%. 3.1 Differential Cross
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the minimum number of jets identifi
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where f’s are probability functio
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hood technique, with a simultaneous
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momentum direction of the b quark f
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Events 200 150 100 50 -1 DØ L=5.4
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after all corrections in the M t¯t
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for prompt J/ψ under the fully tra
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2 Events / 20 MeV/c 50 40 30 20 10
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ATLAS - consists of four parts (mon
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5 D mesons High cross-sections of D
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μ +X') [nb/GeV] → b+X → (pp T
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GeV) μ |
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HEAVY FLAVOUR IN A NUTSHELL Robert
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Figure 1: Overlapping constraints o
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Figure 3: Constraints on new physic
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RECENT B PHYSICS RESULTS FROM THE T
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(IP) distributions are fitted separ
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decays CDF extracts Using a 5.94 fb
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Search for B 0 s → µ+ µ − and
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Ref. 10,11 . The expected GL distri
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IN PURSUIT OF NEW PHYSICS WITH B DE
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τK + K −/τBs 1.01 1.00 0.99 0.9
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CHARMLESS HADRONIC B-DECAYS AT BABA
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surements (fL ∼ 0.5). Several att
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Estimating the Higher Order Hadroni
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the resulting exponent suggests to
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The counterpart of the ground-state
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(a) Tree level signal decay b ¯Bs
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the B0 d system LHCb profits from i
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This result is based on averaging o
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y non-perturbative effects. Using t
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e M(Dπ) distributions obtained D +
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CHARM PHYSICS RESULTS AND PROSPECTS
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LHCb is working towards its first m
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Two body hadronic D decays Yu Fushe
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where the effective coefficients aA
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6. J. J. Sakurai, Phys. Rev. 156, 1
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states: 6π, 2K4π, 4K2π, KSK3π 1
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egion of X(3872), which corresponds
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Figure 1: The π 0 recoil mass spec
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η → π + π − π 0 η ′ →
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conservation. This second principle
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many of them come from gluon nonper
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Latest Jets Results from the Tevatr
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in for the inclusive trijet event s
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RECENT RESULTS ON JETS FROM CMS F.
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dy (pb/GeV) /dp 2 d 10 10 10 9 10
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RECENT RESULTS ON JETS WITH ATLAS G
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| y| < 0.3 ATLAS Preliminary 2.1 <
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EPOS 2 and LHC Results TanguyPierog
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positions are randomly distributed
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ABOUT THE HELIX STRUCTURE OF THE LU
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Figure 2: Left: Correlations betwee
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Improving NLO-parton shower matched
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due to the inclusion of higher orde
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New Results in Soft Gluon Physics C
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Figure 2: Spacetime depiction of Dr
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Central Exclusive Meson Pair Produc
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in the CEP cross section. However i
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AN AVERAGE b-QUARK FRAGMENTATION FU
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1/N dN/dx 3.5 3 2.5 2 1.5 1 0.5 ALE
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W + W + jj at NLO in QCD: an exotic
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Σ fb Σ fb 3.5 3.0 2.5 2.0 0.65 0.
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W/Z+Jets and W/Z+HF Production at t
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Figure 2: Measured inclusive jet di
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W and Z physics with the ATLAS dete
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SHERPA 9 MC generators but not by P
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W/Z + Jets results from CMS V. CIUL
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Events / 0.1 600 500 400 300 200 10
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TEVATRON RESULTS ON MULTI-PARTON IN
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iterative midpoint cone algorithm w
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INVESTIGATIONS OF DOUBLE PARTON SCA
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¦ § ¦ ¨ ¥ ¦ ¨ § ¦ © ¦ §
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Figure 4: Two-dimensional distribut
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SOFT QCD RESULTS FROM ATLAS AND CMS
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as a function of multiplicity for t
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Determination of αS using hadronic
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α S (m Z 0) 0.15 0.14 0.13 0.12 0.
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Reaching beyond NLO in processes wi
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dσ/dp t,max [fb/GeV] 10 5 10 4 10
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Nonlocal Condensate Model for QCD S
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The lower bound for the integration
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AN ALTERNATIVE SUBTRACTION SCHEME F
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where MBorn,g is the underlying Bor
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THE NNPDF2.1 PARTON SET F. CERUTTI
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ottom masses mb of 4.25, 4.5, 5.0 a
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HOLOGRAPHIC DESCRIPTION OF HADRONS
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∫ SYM = κ d 4 ( 1 xdzTr 2 h(z)F
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Nuclear matter and chiral phase tra
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fact that for Nc ≫ 3 a gas of fre
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Recent Results on Light Hadron Spec
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Figure 3: Mass spectrum fitting wit
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MEASUREMENT OF THE J/ψ INCLUSIVE P
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2 Counts per 40 MeV/c 120 100 80 60
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STUDY OF Ke4 DECAYS IN THE NA48/2 E
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photons were accepted while particl
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6. Structure Functions Diffraction
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2 Hadronic Final States and Diffrac
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3 Summary A brief overview of recen
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Using HERA Data to Determine the In
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k f n 0.4 0.2 0 -0.2 0.4 0.2 0 -0.2
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The singular term, on the other han
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Pomeron Kernel: The leading order B
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DIFFRACTION, SATURATION AND pp CROS
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In Ref. 6 , the saturated Froissart
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Transverse Energy Flow with Forward
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1/N d dE t /dη 0.1 0.09 0.08 0.07
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7. Heavy Ions
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dη)/(0.5〈 N 〉 ) part ch (dN 10
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) 3 (fm long R side R out R 400 350
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correlation density is computed as
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Away-side gaussian width 1.4 1.2 1
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Figure 1: (a) J/ψ rapidity distrib
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lower x, or forward rapidity one ex
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φ ∆ /d assoc dN trig 1/N 0.5 0.4
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AA,Pythia I 2.5 2.0 1.5 1.0 0.5 0.0
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(1/N ) dN/dA evt J φ Δ ) dN/d (1/
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[GeV] Tower ET Σ 50 45 40 35 30 25
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3 Results 3.1 Dijet Properties in p
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(GeV/c) (GeV/c) T T p < 40 20
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wheredσm(N +N → h+X)/dp Tdy isth
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R AA 0.6 0.5 0.4 0.3 0.2 0.1 0 0.5
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Here D is the diffusion coefficient
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The effect of triangular flow in je
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When both trigger and associated pa
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The first Z boson measurement in th
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Figure 1: Dimuon invariant mass spe
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2. V. Kartvelishvili, R. Kvatadze a
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esolution [ µ m] ! r 0 d 300 250 2
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Figure 5: Differential transverse m
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Figure 1: Average nuclear modificat
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Another way of using direct photons
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Pb R g 2 Nuclear Modifications for
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q T 1/R AA 1.6 1.4 1.2 1 0.8 LO Fra
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] 2 > [g/cm max
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Methods (a) and (c) constrain the e
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EXPERIMENTAL SUMMARY: ENTERING THE
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ut also for valence quarks involved
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The sensitivity to Standard Model H
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Figure 10: Top pair mass spectrum m
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Figure 13: Particle densities (left
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4 Low energy precision Spectroscopy
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asymmetries associated to Bd and Bs
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XLVIth Rencontres de Moriond QCD an
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