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

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ATLAS - consists of four parts (monitored drift tubes, cathode strip chambers, thin-gap chambers and resistive plate chambers). It covers |η| < 2.7 and due to its toroidal magnetic field it can measure transverse momenta with σpT /pT = 10% at pT = 1 TeV. This system also provides important muon triggers. Two levels of muon reconstruction are used. Muons that have an ID track matched to an MS track are fully reconstructed (combined muons) and their momentum is measured by refitting their track through the detector to give the best precision. Some muons have a clear ID track, but only track segments in the MS so they can be reconstructed only partially (tagged muons). The ATLAS trigger consists of three levels, Level 1 (L1), Level 2 (L2) and Event Filter (EF). L1 trigger is a hardware trigger based on MS, Calorimeters and Minimum Bias Trigger Scintillator (MBTS). L2 and EF triggers are software triggers and are together called High Level Trigger (HLT). Due to a constant increase of data rate throughout 2010, varying trigger conditions and thresholds were used to take data for measurements presented in this paper. 3 Quarkonia Reconstructed invariant mass distributions of c¯c and b ¯ b mesons decaying into muon pairs are used to study Inner Detector performance and alignment algorithms. The resulting spectra obtained from the analysis of 41 pb −1 (full 2010 ATLAS dataset) are shown at Fig. 1. The fitted mass values are in a good agreement with the world averages. Di-muon Candidates / ( 0.017 GeV ) 100 80 60 40 20 3 × 10 ATLAS Preliminary ∫ s = 7 TeV -1 L dt = 41 pb Data: 2010 Fit projection Fit projection of bkg. NJ/ ψ = 846000 ± 1000 µ = 3.095 ± 0.003 GeV J/ ψ σ = 65 ± 1 MeV J/ ψ 0 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2 mµ µ [GeV] Events / ( 0.1 GeV ) 3 × 10 ATLAS Preliminary 10 -1 s = 7 TeV ∫ L dt ~ 41.0 pb 5 Data 2010 : Opposite Sign Fit Projection Fit Projection of Background Barrel + Barrel N( Υ 1S) = 16300 ± 200 (stat.) N( Υ 2S) = 4800 ± 200 (stat.) N( Υ 3S) = 2300 ± 100 (stat.) 0 8 9 10 11 12 Inv. M( µ µ ) [GeV] Figure 1: Di-muon invariant mass spectrum at the J/ψ and ψ(2S) mass range (right) and at the Υ(1S,2S,3S) mass range 4 J/ψ → µ + µ − Differential Cross-sections The study of charmonium production is not interesting for detector performance evaluation only. Processes leading to this production are not well understood. Therefore attention has been paid in ATLAS to measure the J/ψ production cross-section. The analysis was based on an integrated luminosity of 2.3 pb −1 and results of inclusive differential cross-section, its prompt and non-prompt fraction in four rapidity bins covering |y| < 2.4 and J/ψ pT range between 1 and 70 GeV have been obtained. A detailed description can be found here 2 . 4.1 Inclusive J/ψ → µ + µ − Differential Cross-section In order to recover true number of J/ψ decays several corrections for detector efficiency, bin migration and acceptance effects have to be taken into account. Therefore a weight w is applied to each observed J/ψ candidate defined as 1/w = P = A·M·ε 2 trk ·ε+ µ (p+ T ,η+ )·ε − µ (p− T ,η− )·εtrig (1)
Here M is a correction factor for bin migrations, εtrk, εµ and εtrig are the ID tracking, single muon reconstruction and trigger efficiencies, respectively. The kinematic acceptance A depends strongly on the spin alignment (polarisation) of J/ψ. This has not been measured yet at LHC. Large number of spin alignments have been studied, and 5 extreme cases were identified. Acceptance maps for these points were generated and an envelope of the most extreme values is shown in the cross-section plots. The offline single muon reconstruction efficiencies are obtained from data using tag-and-probe method, described here 3,4 . The resulting inclusive differential cross-sections for the central rapidity bin are shown in Fig. 2 (left). dy [nb/GeV] 2 )d σ/dp - µ + Br(J/ ψ→µ 2 10 T 10 10 10 10 1 -1 -2 -3 ATLAS s= 7 TeV -1 ∫L dt = 2.2 pb Inclusive cross-section ATLAS |y |
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2011 QCD and High Energy Interactio
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Proceedings of the XLVIth RENCONTRE
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2011 RENCONTRES DE MORIOND The XLVI
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Foreword Contents 1. Higgs Searches
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1. Higgs
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95% CL Limit/SM 10 1 Tevatron Run I
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Events/5 GeV 6 10 5 10 4 10 3 10 2
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Events / 0.5 CDF Run II Preliminary
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For the most sensitive sub-channel
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Table 1: Table listing the various
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various SM Higgs mass hypotheses. T
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constraints on parameters are given
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Figure 2: Invariant mass of the ele
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Figure 4: CDF Exclusion limits for
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Table 1: Main phases of 2010 commis
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Table 4: Parameter list for early (
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luminosity of 1.2×10 33 cm −2 s
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2 QCD Analysis settings HERA PDFs a
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min 2 - 2 20 15 10 5 0 H1 and ZEUS
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SM σ / σ 95% CL Limit on 3 10 2 1
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NNLO σ/ σSM 95% CL Upper Bound on
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the report of this working group. I
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2.3 The impact of different PDF par
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SUSY Searches at the Tevatron Ph. G
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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
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Page 84 and 85: of about 9%. 3.1 Differential Cross
Page 86 and 87: Figure 5: Summary of most recent CD
Page 88 and 89: the minimum number of jets identifi
Page 90 and 91: where f’s are probability functio
Page 92 and 93: hood technique, with a simultaneous
Page 94 and 95: momentum direction of the b quark f
Page 96 and 97: Events 200 150 100 50 -1 DØ L=5.4
Page 98 and 99: after all corrections in the M t¯t
Page 100 and 101: for prompt J/ψ under the fully tra
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Page 106 and 107: 5 D mesons High cross-sections of D
Page 108 and 109: μ +X') [nb/GeV] → b+X → (pp T
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Page 113 and 114: HEAVY FLAVOUR IN A NUTSHELL Robert
Page 115 and 116: Figure 1: Overlapping constraints o
Page 117 and 118: Figure 3: Constraints on new physic
Page 119 and 120: RECENT B PHYSICS RESULTS FROM THE T
Page 121 and 122: (IP) distributions are fitted separ
Page 123 and 124: decays CDF extracts Using a 5.94 fb
Page 125 and 126: Search for B 0 s → µ+ µ − and
Page 127 and 128: Ref. 10,11 . The expected GL distri
Page 129 and 130: IN PURSUIT OF NEW PHYSICS WITH B DE
Page 131 and 132: τK + K −/τBs 1.01 1.00 0.99 0.9
Page 133 and 134: CHARMLESS HADRONIC B-DECAYS AT BABA
Page 135 and 136: surements (fL ∼ 0.5). Several att
Page 137 and 138: Estimating the Higher Order Hadroni
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Page 141: The counterpart of the ground-state
Page 144 and 145: (a) Tree level signal decay b ¯Bs
Page 146 and 147: the B0 d system LHCb profits from i
Page 148 and 149: This result is based on averaging o
Page 150 and 151: y non-perturbative effects. Using t
Page 152 and 153: 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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