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Figure 4: CDF Exclusion limits for cross section times products of branching ratios decay as a function of the decay length of a Hidden Valley particle coming from the interaction h → HV HV → b ¯ bb ¯ b. against that background is provided by the HV decay length, ζ, and the b jet impact parameter, ψ, which have values near zero for the background but are of order centimeters for the signal. There is only one event observed with a large value of ζ and limits on the cross section time branching ratio as a function of decay length are shown in Figure 4 by CDF for a sample of data having an integrated luminosity of 5.8 fb −1 . 6 Summary CDF and D0 are looking for Higgs bosons in a variety of models beyond the standard model and are using advanced analysis techniques in a harsh background environment to do this. Results were shown for data samples having an integrated luminosity between 2.4 and 8.2 fb −1 . The MSSM sensitivity to tan β of order 30 has been obtained. With the full dataset this sensitivity could be as low as 20. CDF now excludes a fourth generation model for 123 < mh < 202 GeV/c 2 comparable to the combined Tevatron limits and the CMS limits. When a fermiophobic Higgs is found, D0 claims that it must have a mass greater than 112 GeV/c 2 . The Hidden Valley has been explored but nothing is seen just yet. Acknowledgments The author would like to thank the organizers for this invitation to speak and the wonderful atmosphere of the conference. References 1. B. Holdom et al., PMC Phys. A 3, 4 (2009). 2. R.Lysak, ”Searches for High-Mass SM Higgs at the Tevatron”, these proceedings. 3. T. Aaltonen et al., The CDF and D0 Collaborations, Phys. Rev. D 82, 011102(R) (2010). 4. The CMS Collaboration, CERN-PH-EP/2011-015, arXiv:hep-ex/1025429v2. The expected limits quoted here have been read from the figure since numerical values are not quoted in the text. 5. T. Aaltonen et al., The CDF Collaboration, Phys. Rev. Lett. 103, 061803 (2009). 6. V. M. Abazov et al., The D0 Collaboration, Phys. Rev. Lett. 101, 051801 (2008). 7. A. Rosca, arXiv:hep-ph/0212038v1 (2002). 8. The TEVNPH Working Group for the CDF and D0 Collaborations, arXiv:hepex/1003.3363v2. 9. V. M. Abazov et al., The D0 Collaboration, Phys. Lett. B 698, Issue 2, pp 97-174 (4 April 2011). 10. M. Strassler and K. Zurek, Phys. Lett. B 661, 263 (2008). M. Strassler and K. Zurek, Phys. Lett. B 651, 374 (2008).
LHC BEAM OPERATIONS: PAST, PRESENT AND FUTURE M. Lamont CERN, Geneva, Switzerland LHC commissioning made good progress in 2009 and 2010 - a brief summary is presented. The present status of the machine is given and the short and medium term prospects discussed. 1 Introduction 2010 was the first full year of LHC commissioning and it saw a number of important operational milestones. These included: first collisions at 3.5 TeV; commissioning of the squeeze; the move to physics with nominal bunch intensity; the move to bunch trains followed by a phased increase in intensity. A peak luminosity of 2 × 10 32 cm −2 s −1 was achieved with an integrated luminosity of 6 pb -1 per day delivered in the final week of proton operations. The year culminated in a successful ion run. 2011 has seen a rapid re-commissioning of the machine after the Christmas stop with the main milestones listed below. • 19 th February: circulating beams re-established. • 3 rd March: first collisions at 3.5 TeV, β ∗ =1.5 m with pilot beams. • 5 th March: nominal bunches at 3.5 TeV, start of collimator set-up program. • 13 th March: first stable beams, 3 bunches per beam, initial luminosity 1.6 × 10 30 cm −2 s −1 By 21 st March 2011, the LHC was back up to a peak luminosity of 1 × 10 32 cm −2 s −1 boding well for the push towards the year’s target of 1 fb -1 . 2 Overview of 2010 The clear priority of 2010 was to lay the foundations for 2011 and the delivery of 1 fb −1 . The peak luminosity target was 1×10 32 cm −2 s −1 . Solid operational experience of injecting, ramping, squeezing and establishing stable beams was gained and a large number issues were addressed along the way. A period of steady running at or around 1 MJ for an extended period was used to fully verify machine protection and operational procedures before performing a safe, phased increase in intensity with validation and a running period after each step-up in intensity. The luminosity delivery in 2010 can be divided into three main periods: the initial luminosity run with low bunch currents; nominal bunch operation with up to 48 bunches; and the performance ramp up period after the commissioning of bunch trains. The main milestones of 2010 commissioning are outlined in Table 1. Some notable achievements of the year’s commissioning are shown in Table 2.
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 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 38 and 39: min 2 - 2 20 15 10 5 0 H1 and ZEUS
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)
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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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