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

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as main discriminator between events with real and fake missing transverse energy 3 . Three independent data-driven techniques have been used for the background estimate. 13 events are observed after all the selection, in agreement with the expectations from the Standard Model. A variation of the analysis based on the αT variable is performed requiring a b-tagged jet in the final state, in order to reduce non-top backgrounds and to enhance the sensitivity to models with an increased third generation activity 4 . The other two approaches are based on the MHT variable 5 and on the Razor variable 6 respectively. These two approaches are complementary, since the former is based on the understanding of the detector response in detail, while the latter relies on the kinematics of the event. The two analyses use both data-driven techniques for the estimate of the backgrounds. The fact that they give similar limits gives further confidence of the capability of CMS to discover Supersymmetry when it will appear. The mSUGRA exclusion limits for all the hadronic analysis separately are shown in fig. 1. The combination of the exclusion limits from all the fully hadronic analyses is given in the framework of the simplified models 7 , and is shown in fig. 2. (GeV) 1/2 m 400 350 300 250 200 150 = LSP τ ∼ -1 CMS preliminary L = 36 pb , int αT LM1 Razor q~ (500)GeV q~ (800)GeV q~ (650)GeV OS Dilepton SS Dilepton αT+b-tag Lepton+MET s = 7 TeV g , q~ , tanβ=5, μ
4 Final states with photons, jets and missing transverse energy The framework considered is the General Gauge Mediation (GGM), in which the Next-to- Lightest Supersymmetric Particle (NLSP) is the Neutralino, which decays into a Gravitino and a photon. The final state is hence characterized by two photons, jets and missing transverse energy given by the Gravitinos escaping the detector. As for the searches of the previous section, no assumption are made on the model, and the search is model independent, based exclusively on inclusive cuts on the objects of the final state 8 . The dominant background is given by QCD jets with misidentified photons and mismeasured missing transverse energy and is estimated with a data-driven technique. After the selection cuts one event is observed, in agreement with the background estimate. The result is interpreted as an exclusion curve in the squark-gluino mass plane, as shown in fig. 1. In GGM if Winos and Binos are mass degenerate NLSP’s, the diphoton signature can be replaced by a photon-lepton signature. In this case the dominant background is given by Wγ events. The Monte Carlo for this process has been validated on the cross section measured by CMS 9 , and is therefore used for the background estimate. In both the electron-γ and muon-γ final states one event is observed, in agreement with the estimated background 10 . 5 Final States with two opposite sign leptons, jets and missing transverse energy From Monte Carlo studies, the dominant background for this signature is tt. For this reason, the same preselection as the one used in the CMS tt cross section measurement is used 11 . After the preselection cuts a good agreement is found between data and Monte Carlo in the distribution of many variables. Two independent data-driven estimates for the backgrounds are used. The first one is the so-called ABCD or matrix method: a plane is defined with two uncorrelated variables for tt. The two variables are in this case HT and y = MET / √ HT . After defining a signal region with tighter cuts than the ones used for the preselections, the plane is split in four sub-regions. If the assumption of the uniform distribution of the background in the plane is verified, the number of events in the fourth sub-region can be estimated from the other three sub-regions. The second data-driven technique is based on the assumption that in tt events the missing transverse energy is given by the neutrinos produced by the W’s. Since the two leptons from the W’s show a similar kinematic behaviour than the neutrinos, the missing transverse energy can be estimated from the dilepton spectrum. The method is validated in a control region defined by a low value of the y variable, and it is then applied to the signal region. One event is observed after all the selection cuts, in agreement with all the Monte Carlo and datadriven estimates of the background. In addition to the exclusion limit in the mSUGRA plane (fig. 1), a parametrization of efficiencies and acceptances is given. With this parametrization, generator level studies of every possible model are possible 12 . 6 Final States with two same sign leptons, jets and missing transverse energy The search in the same sign dilepton final state is performed in four different kinematic regions. After the selection of two electrons or muons, the first with pT > 20 GeV/c and the second with pT > 10 GeV/c, the first region is defined with HT>60 GeV/c and MET>80 GeV/c 2 , the second with HT>200 GeV/c and MET>30 GeV/c 2 . The third region is chosen in order to have lepton pT ’s as low as possible: the cuts are 5 GeV/c for the muons and 10 GeV/c for the electrons, accompanied by HT>200 GeV/c and MET>30 GeV/c 2 . The fourth region is defined with the same cuts on the electrons and muons as the third one. In this case tau’s are also considered, with pT > 15 GeV/c. Since the tau’s are more affected by the QCD background the cuts on HT and MET are raised to HT>350 GeV/c and MET>50 GeV/c 2 . The signature with two same
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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
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 (
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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
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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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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
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Page 90 and 91: where f’s are probability functio
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Page 96 and 97: Events 200 150 100 50 -1 DØ L=5.4
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Page 104 and 105: ATLAS - consists of four parts (mon
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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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