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

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consistent with the known decays B → Kη and B → K ∗ (892)η. Over half of the events (7σ significance) are located in the high-mass region (mXs > 1.8 GeV/c 2 ), which was not covered by previous exclusive measurements. Using the 13 modes for which the B flavor is given by the final state, the direct CP-asymmetry can be computed: ACP = −0.13 ± 0.04 +0.02 −0.03 which is consistent with predictions. The mXs spectrum shapes and branching fractions are comparable for the η and the η ′ , which rules out the hypothesis of specific η ′ mechanisms. 2 Events / (2 MeV/c ) 500 400 300 200 100 (a) 0 5.23 5.24 5.25 5.26 5.27 5.28 5.29 2 M bc (GeV/c ) )) 2 / (0.2 GeV/c -5 (10 Xs dB/dM 10 8 6 4 2 (b) 0 0.5 1 1.5 2 2.5 2 MXs (GeV/c ) Figure 2: Left: Mbc distribution for the full mass range; the points are the data, the solid red line the overall fit function, the magenta dashed line the signal, the green dotted line the b → c background and the blue dash-dotted the continuum. Right: differential branching fraction as a function of mXs. Acknowledgments I’d like to thank E. Ben-Haim and A. Gaz for their comments on my talk and the proceedings. References 1. D. Asner et al, arXiv:1010.1589 [hep-ex]; http://www.slac.stanford.edu/xorg/hfag 2. M. Kobayashi and T. Maskawa, Prog. Theor. Phys. 49, 652 (1973). 3. J.P. Lees et al, Phys. Rev. D 84, 012001 (2011). 4. P. del Amo Sanchez et al., Phys. Rev. D 83, 051101 (2011). 5. P. del Amo Sanchez et al., Phys. Rev. D 83, 031103 (2011). 6. H. J. Hyun et al, Phys. Rev. Lett. 105, 091801 (2010). 7. K. Nishimura et al, Phys. Rev. Lett. 105, 191803 (2010). 8. B. Aubert et al., Nucl. Instrum. Methods A 479, 1 (2002). 9. A. Abashian et al., Nucl. Instrum. Methods A 479, 117 (2002). 10. PEP-II Conceptual Design Report, SLAC-0418 (1993). 11. S. Kurokawa and E. Kikutani, Nucl. Instrum. Methods A 499, 1 (2003). 12. M. Hazumi, Phys. Lett. B 583, 285 (2004). 13. B. Aubert et al., Phys. Rev. Lett. 97, 261803 (2006). 14. H. C. Huang et al., Phys. Rev. Lett. 91, 241802 (2003); Y. T. Shen et al., arXiv:0802.1547 15. S. Fajfer, T. N. Pham, and A. Prapotnik, Phys. Rev. D 69, 114020 (2004); C.-H. Chen and H.-n. Li, Phys. Rev. D 70, 054006 (2004). 16. See discussion in the BABAR article 4 and references therein. 17. B. Aubert et al., Phys. Rev. Lett. 97, 201801 (2006). 18. See discussion in the BABAR article 5 and references therein. 19. J. Chang et al., Nature 456, 362 (2008)); O. Adriani et al., Nature 458, 607 (2009). 20. S.V. Demidov and D. S. Gorbunov, JETP Lett. 84, 479 (2007). 21. T. E. Browder et al., Phys. Rev. Lett. 81, 1786 (1998); G. Bonvicini et al., Phys. Rev. D 68, 011101 (2003); B. Aubert et al., Phys. Rev. Lett. 93, 061801 (2004).
Estimating the Higher Order Hadronic Matrix Elements in the Heavy Quark Expansion THOMAS MANNEL Theoretische Elementarteilchenphysik, Naturwiss. Techn. Fakultät, Universität Siegen, 57068 Siegen, Germany The non-perturbative input in the heavy quark expansion relevant for precision determinations of CKM matrix elements from heavy hadron decays consists of certain forward matrix elements of local operators. While at low orders these matrix elements may be determined from experiment, the number of independent matrix elements at higher orders is way too large to extract them from data. Hence an estimate for these matrix elements from the theoretical side is necessary. In this contribution I present a way to estimate these matrix elements in a simple way. 1 Introduction The theoretical description of semi-leptonic decays of heavy hadrons is in a very mature state. The major tool for reliable calculations is the Heavy Quark Expansion (HQE) and Heavy Quark Effective Theory (HQET) together with the Heavy Quark Symmetries (HQS) appearing in the heavy mass limit. The determination of Vcb can be performed from exclusive as well as from inclusive decays. While the inclusive determination makes use of the HQE, the exclusive determination uses HQS, which constrain the form factors at the non-recoil point, where the four-velocities of the initial and final state hadrons are the same. The theory for the inclusive determination based on HQE has reached the status of a precision calculation. It is based on the computation of the total rate, which in HQE is given as a combined series in αs(mb) n , (ΛQCD/mb) m , and (ΛQCD/mc) k (ΛQCD/mb) l+3 1 . Currently the leading term m = k = 0 is known to order α 2 s 2,3 , the first sub-leading corrections are partially known to order α 2 s × (ΛQCD/mb) 2 4 , while the tree level terms are known to order (ΛQCD/mb) m 5 , and the term involving inverse powers of mc (ΛQCD/mc) 2 (ΛQCD/mb) 3 6 . Overall, this calculation has reached a theoretical uncertainty at the level of one percent. In order to explore the higher orders of the HQE quantitatively, it is mandatory to have a way to estimate the hadronic matrix elements appearing as the nonperturbative input. In the following I shall present a method for such an estimate.
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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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Page 113 and 114: HEAVY FLAVOUR IN A NUTSHELL Robert
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Page 119 and 120: RECENT B PHYSICS RESULTS FROM THE T
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Page 133 and 134: CHARMLESS HADRONIC B-DECAYS AT BABA
Page 135: surements (fL ∼ 0.5). Several att
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Page 155 and 156: CHARM PHYSICS RESULTS AND PROSPECTS
Page 157 and 158: LHCb is working towards its first m
Page 159 and 160: Two body hadronic D decays Yu Fushe
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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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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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