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For the most sensitive sub-channel which have dilepton mass outside the Z-boson mass window, the expected yield of signal is 0.9 events and 15 background events. The expected limit on Higgs production is 6.6·σSM for this sub-channel. 3 Limits on Higgs production We combine all the above mentioned channels from each experiment. Since no excess of data above the background expectations is seen by CDF experiment nor the D0 experiment, we place the limits on SM Higgs boson production cross section. The limits are presented as a ratio of the 95% C.L. observed (and expected) limits to the SM Higgs boson production cross section and as a function of Higgs boson mass, see Fig. 2. When the ratio is lower than 1.0, we exclude the SM Higgs boson at 95% C.L. for a given mass. CDF collaboration excludes the SM Higgs boson in mass range 158 – 168 GeV/c 2 (with expected exclusion being 159 – 168 GeV/c 2 ) while D0 excludes the mass range of 163 – 168 GeV/c 2 (with expected exclusion being 160 – 168 GeV/c 2 ). 95% CL Limit / SM -1 DØ Preliminary, L=4.3-8.2 fb SM Higgs Combination Standard Model = 1.0 1 Observed Expected Expected ± 1σ Expected ± 2σ DØ Exclusion 130 140 150 160 170 180 190 200 March 7, 2011 2 m (GeV/c ) Figure 2: Ratio of the 95% C.L. observed (and expected) limits to the SM Higgs boson production cross section as a function of Higgs boson mass. Both, CDF (left plot) and D0 limits (right plot) are shown. 4 Conclusion The CDF and D0 collaborations search for the high-mass standard model Higgs boson in many different channels. The CDF collaboration excludes the existence of Higgs boson at 95% C.L. with the mass in the range of 158 – 168 GeV/c 2 using integrated luminosity of up to 7.1 fb −1 while D0 collaboration excludes the mass range of 163 – 168 GeV/c 2 based on luminosity of up to 8.2 fb −1 . The combination of CDF and D0 results leads to Higgs boson exclusion in the mass range of 158 – 173 GeV/c 2 , see 3 . Acknowledgments The author would like to thank the organizers for a wonderful conference. References 1. R. Barate et al., Phys. Lett. B 565, 61 (2003). 2. Tevatron Electroweak Working Group, March 2011, http://tevewwg.fnal.gov 3. Jonathan Hays, “Combinations of Searches for SM Higgs at the Tevatron”, these proceedings H
Standard Model Higgs Searches at the Tevatron: Combinations Jonathan Hays on behalf of the CDF and DØ Collaborations Department of Physics, Imperial College London, Prince Consort Road, London SW7 2BW, United Kingdom Combined limits are presented from CDF and D0 on direct searches for the standard model Higgs boson in p¯p collisions at the Fermilab Tevatron at √ s= 1.96 TeV. The results presented here include updates with respect to previous combinations for those analyses targeted at Higgs bosons with masses in the range 130 < mH < 200 GeV, where the decay to W + W − provides the greatest sensitivity. In this update new data are included and existing analyses have been improved to enhance sensitivity. With up to 7.1fb −1 of data from CDF and up to 8.2fb −1 from D0, the 95% C.L. upper limit on Higgs boson production is a factor of 0.54 times the SM cross section for a mass of 165 GeV. The range 158 < mH < 173 GeV is excluded at the 95% C.L. 1 Introduction The search for the origin of mass and the the mechanism behind electroweak symmetry breaking has been one of the major goals of particle physics for many years. Within the standard model (SM) this is achieved through the Higgs mechanism leading to the prediction of the existence of a relatively light massive scalar boson. Both CDF and D0 have performed new combinations 1,2 of multiple direct searches for the SM Higgs boson. These new combinations make use of a larger data sample and improved analysis techniques when compared with previous analyses. 3,4 In these proceedings the latest combination is presented. The general strategy has been to combine as many channels as possible and across both experiments to achieve the highest possible sensitivity. This update concentrates on the analysis in the higher mass region, 130 < mH < 200 GeV where the most important decay is W + W − , though acceptance for decays in tau pairs and di-photons are included from D0. 2 Combination In this update the searches have been separated into 46 mutually exclusive final states (12 from CDF and 34 from D0). A summary of these are given in Table 1. Full details of the combination procedure and the contributing analyses can be found in 5 and references 1-14 therein. These contributing analyses make use of many different observables, the distributions of which are used as input to the statistical combination. This makes it difficult to visualize in a single plot the comparison of the data with the predicted signal (s) and background (b) outcomes. Since events of similar signal-to-background ratio can be combined without substantial loss in sensitivity, one approach is to bin the data and the signal and background predictions in s/b and compare the results distributions. Since the analyses considered cover a large range of s/b they are histogrammed in Figure 1 in terms of log10(s/b) to enable the full range to be
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 20 and 21: Table 1: Table listing the various
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Page 24 and 25: constraints on parameters are given
Page 26 and 27: Figure 2: Invariant mass of the ele
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Page 36 and 37: 2 QCD Analysis settings HERA PDFs a
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Page 42 and 43: NNLO σ/ σSM 95% CL Upper Bound on
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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
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) [pb] ν e → B(W’ × σ 10 1 -
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2 Searches in the dijet final state
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ing that the neutrinos were the onl
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The Quasi-Classical Model in SU(N)
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g (γ µ kµ) γ µ Aa µ g (pk)
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3. Top
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of their vertex with respect to the
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of about 9%. 3.1 Differential Cross
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Figure 5: Summary of most recent CD
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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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