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In p+p collisions, in which there is no medium, we see a back to back di-jet structure which peaks at ∆φ ≈ 0 (same side) and π (away-side). In Au+Au collisions, after the underlying event described by Eq. 2 has been subtracted, the shape of the jet is significantly modified. In the away-side there is a double-peak structure where there are two peaks sitting at ∆φ ≈ π ± 1. At ∆φ ≈ π, there is a local minimum instead of a peak. This double-peak structure is known as ‘shoulder’ 5,6,7 . In the near-side, the peak at ∆φ = 0 remains, but with an enhancement along the ∆η direction known as the ’ridge’ 8,9 . Since v3, which is the coefficient of cos 3∆φ, peaks at 0, π/3 and 2π/3, it is a natural candidate to explain the ridge and shoulder structure. In order to answer if v3 can fully explain these structures, we need to have direct measurement of v3. The PHENIX experiment at Relativistic Heavy Ion Collider in Brookhaven National Laboratory has measured the v2, v3 and v4 with two different methods, the event plane method and the two-particle correlation method. For the event plane method, PHENIX uses several forward detectors such as the Reaction Plane Detector (RXN, 1.0 < |η| < 2.8), Muon Piston Calorimeter (MPC, 3.1 < |η| < 3.7) and Beam Beam Counter (BBC, 3.1 < |η| < 3.9) to reconstruct the nth event plane, ψn. We then measured the particle distribution along with ψn, and extract vn according to Eq. 1. The v2, v3 and v4 are measured as a function of particle pT and centrality and are shown in Fig. 1. Fig. 1 shows that there is a non-zero v3 which exists in all centralities. v3 increases with pT but does not have a strong centrality dependence. In previous PHENIX meausrements 2 , we published the results of v4 measured with respect to ψ2. The v4 shown here is measured with respect to ψ4, which should maximize the v4 value. The value here (v4{ψ4}) is significantly large than (v4{ψ2}) 2 . n v 0.25 0.2 0.15 0.1 0.05 0 0.25 Au+Au s =200GeV NN 0.2 0.15 0.1 0.05 0 v2{ ψ } 2 v { ψ 4 } 4 0.25 0.2 0.15 0.1 0.05 0 0.25 0.2 0.15 0.1 0.05 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0.25 0-10% 0.25 10-20% 0.25 20-30% 0.25 30-40% 0.25 40-50% 0.25 50-60% 0.2 0.15 0.1 0.05 0 0.2 0.15 0.1 0.05 0 v3{ ψ } 3 0.2 0.15 0.1 0.05 0 0 0.2 0.15 0.1 0.05 0 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 0 0.5 1 1.5 2 2.5 3 3.5 p T [GeV/c] Figure 1: vn measured with event plane method in various centralities. The second method we used to measure vn is via the two particle correlations. The two particle azimuthal correlation can be expanded as a Fourier series as Eq. 3, where cn = vtrig n (ptrig T )vassoc n (passoc T ) 0.25 0.2 0.15 0.1 0.05 0 0.2 0.15 0.1 0.05 0 CF(∆φ) ∝ (1 + Σ2cn cos n(∆φ)) (3) 0.25 0.2 0.15 0.1 0.05 0 0.2 0.15 0.1 0.05 0
When both trigger and associated particles are in the same pT bin, vn = √ c n . In PHENIX, we use both trigger and partner particles detected by the central arm (|η| < 0.35). In order to reduce the jet contribution while still keeping enough signal, we require the η difference between the two particles to be 0.3 < |∆η| < 0.7. The result, v3{2P}, is compared with the event plane method and is shown in Fig. 2. The v3 from both methods agrees very well. But v3{2P} is generally larger than v3{ψ3}.This difference is likely due to some residual jet contribution in the two particle correlation method, which makes the measured v3 larger than the event plane method. We also compared these results with hydrodynamical predictions with Glauber initial state distribution and η/s = 0.08 10 . The prediction agrees well with the data, which indicates that v3, just like v2, can be well described by viscous hydrodynamical calculations. 3 v PHENIX preliminary 0.16 v3 30-40% 0.14 h-h, 0.3
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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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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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Page 342 and 343: Here D is the diffusion coefficient
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Page 383 and 384: 4 Low energy precision Spectroscopy
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