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

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the B0 d system LHCb profits from its excellent proper time resolution and is able to overcome the statistical limitation. mix A 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 LHCb preliminary s=7 TeV -1 ~35 pb -1 0 2 4 6 8 t [ps] (a) B 0 d mixing asymmetry ln L Δ -2 45 40 35 Δ 30 25 20 15 10 5 -1 ~35 pb LHCb preliminary s = 7 TeV 0 0 5 10 15 20 (b) Likelihod scan over ∆ms -1 Δ ms [ps ] Figure 3: (a) The mixing frequency in the B0 d system is determined via the time dependent mixing asymmetry. (b) The results of the likelihood scan over the mixing frequency ∆ms in the B0 s system. A minimum is observed for ∆ms = (17.63±0.11stat.)ps −1 . 6 Summary Themainsteps ontheway toameasurement of φs at LHCbhave beenpresented. Usingthedata taken by the LHCb detector in 2010 the polarization amplitudes and strong phases for the P → VV decay B0 d → J/ψK∗ havebeenextracted. Anuntagged analysis wasperformedtodetermine the decay width difference in the B0 s system giving ∆Γs = (0.077±0.119stat. ±0.021syst.)ps −1 . Additionally the mixing frequencies in both the B0 d and B0 s systems have been extracted. The measurement of ∆ms = (17.63±0.11stat.±0.04syst.)ps −1 is competitive with the world average. References 1. CKMfitter Group (J. Charles et al.), Eur. Phys. J. C41, 1-131 (2005) [hep-ph/0406184], updated results and plots available at: http://ckmfitter.in2p3.fr 2. The LHCb Collaboration, “Untagged angular analysis of B 0 s → J/ψφ and B 0 → J/ψK ∗ with the 2010 data”, LHCb-CONF-2011-002. 3. The LHCb Collaboration, “Measurement of ∆md in B 0 → Dπ”, LHCb-CONF-2011-010. 4. The LHCb Collaboration, “Measurement of ∆ms and calibration and tuning of the Same- Side Tagging algorithm with B 0 s → Dsπ decays using the 2010 data sample”, LHCb- CONF-2011-005. 5. Alexander Lenz, Ulrich Nierste, Numerical updates of lifetimes and mixing parameters of B mesons, Proceedings of the CKM workshop 2010 in Warwick, hep-ph/1102.4274v1 6. CDF Collaboration (A. Abulencia et al.), “Observation of B0(s) - anti-B0(s) Oscillations”, Phys.Rev.Lett.97:242003,2006., hep-ex/0609040 7. CDF Collaboration (A. Abulencia et al.), “An Updated Measurement of the CP Violating Phase βs with L = 5.2fb −1 ”, Public Note 10206 8. The LHCb Collaboration, “b-hadron lifetime measurements with exclusive B → J/ψX decays reconstructed in the 2010 data”, LHCb-CONF-2011-001. 9. G.J.Feldman andR.D. Cousins,“A UnifiedApproachtotheClassical Statistical Analysis of Small Signals,” Phys. Rev. D 57, 3873 (1998) [arXiv:physics/9711021].
DIRECT CP ASYMMETRY IN ¯B → Xs,d γ DECAYS GIL PAZ Enrico Fermi Institute The University of Chicago, Chicago, Illinois, 60637, USA The CP asymmetry in inclusive ¯ B → Xs,d γ decays is an important probe of new physics. The theoretical prediction was thought to be of a perturbative origin, and in the standard model, to be about 0.5 percent. In a recent work with M. Benzke, S.J. Lee and M. Neubert, we have shown that the asymmetry is in fact dominated by non-perturbative effects. Since these are hard to estimate, it reduces the sensitivity to new physics effects. On the other hand, these new non-perturbative effects suggest a new test of new physics by looking at the difference of the CP asymmetries in charged versus neutral B-meson decays. 1 Introduction Inclusive radiative B decay modes such as ¯ B → Xs γ do not occur in the Standard Model (SM) at tree-level. They can only take place via loop suppressed processes. At low energies, one can describe the decay ¯ B → Xs γ via the operator Q7γ = (−e/8π 2 )mb¯sσµνF µν (1 + γ5)b, which appears in the effective Hamiltonian as Heff ∋ −(GF / √ 2)λtC7γQ7γ. The decay ¯ B → Xs γ can also receive contributions from loops that contain particles which appear in extensions of the SM, making it an important probe of new physics effects. Such effects would only modify the Wilson coefficient C7γ in the effective Hamiltonian. But Q7γ is not the only operator that contributes to ¯ B → Xs γ. Instead of producing the photon directly, we can produce a gluon or a quark pair and convert them to a photon. In other words, the contribution of operators such as Q8g = (−g/8π 2 )mb¯sσµνG µν (1 + γ5)b and Q c 1 = (¯cb)V −A(¯sc)V −A is also important. Such a conversion usually “costs us” either a factor of αs from a loop that contains a “hard” gluon, or a factor of ΛQCD/mb from a production of extra “soft” particles in the conversion process. In summary, in order to describe inclusive radiative B decays we need the full effective Hamiltonian Heff = GF √2 + p=u,c λp C1Q p p 1 + C2Q2 i CiQi + C7γQ7γ + C8gQ8g + h.c. , (1) where λp = V ∗ pbVps (λp = V ∗ pbVpd) for ¯ B → Xs γ ( ¯ B → Xd γ) decays. The most important operators, due to their larger Wilson coefficients, are Q7γ, Q8g, and Q1. From the effective Hamiltonian one can calculate various observables, in particular the CP asymmetry which is the topic of this talk. The measured CP asymmetry in ¯ B → Xs γ, as given by the Heavy Flavor Averaging Group, is 1 AXsγ = Γ( ¯ B → Xsγ) − Γ(B → X¯sγ) Γ( ¯ = −(1.2 ± 2.8)% . (2) B → Xsγ) + Γ(B → X¯sγ)
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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
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SUSY searches at ATLAS N. Barlow, o
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channel. These results are combined
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Figure 2: The top left plot shows t
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2010 data. Analysis techniques for
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as main discriminator between event
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sign leptons is particularly intere
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N of events 5 10 DATA 10 4 3 10 10
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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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Page 104 and 105: ATLAS - consists of four parts (mon
Page 106 and 107: 5 D mesons High cross-sections of D
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Page 113 and 114: HEAVY FLAVOUR IN A NUTSHELL Robert
Page 115 and 116: Figure 1: Overlapping constraints o
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Page 119 and 120: RECENT B PHYSICS RESULTS FROM THE T
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Page 125 and 126: Search for B 0 s → µ+ µ − and
Page 127 and 128: Ref. 10,11 . The expected GL distri
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Page 141: The counterpart of the ground-state
Page 144 and 145: (a) Tree level signal decay b ¯Bs
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Page 155 and 156: CHARM PHYSICS RESULTS AND PROSPECTS
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Page 159 and 160: Two body hadronic D decays Yu Fushe
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Page 163: 6. J. J. Sakurai, Phys. Rev. 156, 1
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Page 174 and 175: conservation. This second principle
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Page 179 and 180: Latest Jets Results from the Tevatr
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Page 183 and 184: RECENT RESULTS ON JETS FROM CMS F.
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Page 187 and 188: RECENT RESULTS ON JETS WITH ATLAS G
Page 189 and 190: | y| < 0.3 ATLAS Preliminary 2.1 <
Page 191 and 192: EPOS 2 and LHC Results TanguyPierog
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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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