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

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Figure 4: Measurements and prospects for new physics in flavour-specific asymmetry. The asymmetry in neutral B 0 mixing, a d fs is plotted against the asymmetry in neutral B 0 s-mixing, a s fs. The left figure is reproduced 2 (slightly modified), the recent DØ measurement in red is the first measurement inconsistent with the Standard Model point of ∼ (0, 0). The right figure also has superimposed the LHCb expected result from simulation (Monte Carlo), should the DØ central value hold and should there be no new physics in a d fs. There we scale the Monte Carlo (MC) prediction 14 to the yields in real data and add also the expected systematic uncertainties. good constraints on this new physics. Finally we have already seen evidence for a departure of observation from the Standard Model in the mixing of neutral mesons, thanks to the recent measurement from DØ. In this interesting area LHCb will endeavour to make an early complementary measurement. We stand at the very beginning of the LHC era, which is already proving to be one of the most exciting times in the history of particle physics. 5 Acknowledgements Many thanks to the conference organisers for the invitation. Thanks to J. Albrecht, U. Kerzel, T. Ruf and G. Wilkinson, for their invaluable support. Thanks also to the CKM fitter group for updating the fit results in the so-called “Bs-triangle,” pointing out to me a long-standing goof in the LHCb TDR and other publications, including my own Thesis, also for putting up with my crazy questions about their fitting methods. References 1. W. Prout, Annals of Philosophy 6 (1815) pp. 321-330. 2. DØ Collaboration, Phys. Rev. Lett. 105 (2010) pp. 081801, hep-ex arxiv:1005.2757. 3. A. Lenz and U. Nierste, hep-ph arXiv:1102.4274 (2010). 4. N. Jarosik et al., ApJS 192 14 (2011). 5. G. Wilkinson, proceedings of this conference, 2010. 6. A. D. Sakharov, JETP 5 (1967) pp. 24-27. Republished in Soviet Physics Uspekhi. 7. A. B. Carter and A. I. Sanda, Phys. Rev. D 23 (1981) pp. 1567-1579. 8. CKMfitter Group, Eur. Phys. J. C41, 1-131 (2005), http://ckmfitter.in2p3.fr. 9. LHCb collaboration, CERN-LHCb-PUB-2009-029, hep-ex arXiv:0912.4179. 10. HFAG, http://www.slac.stanford.edu/xorg/hfag/rare/ichep10/acp/index.html 11. LHCb collaboration, CERN-LHCb-PH-EP-2011-029, hep-ex arXiv:1103.2465. 12. A. Lenz et al., Phys. Rev. D 83 (2011) pp. 036004, hep-ph arXiv:1102.4274. 13. U. Nierste, hep-ph 0406300 (2006). 14. R. W. Lambert, CERN-THESIS-2009-001 (2008).
RECENT B PHYSICS RESULTS FROM THE TEVATRON SATYAJIT BEHARI (for the CDF and DØ Collaborations) Department of Physics, The Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA We review recent B physics results from the CDF and DØ experiments in p¯p collisions at √ s = 1.96 TeV. Using a data sample of 1.4-6.0 fb −1 collected by the CDF II detector we present searches for New Physics in Bs sector and some competitive results with B-factories in the B /charm sector. In the first category we report the BR in Bs → J/ψf0(980) decays and the time-integrated mixing probability (¯χ) of B mesons. In the second category BR and ACP in doubly Cabibbo-suppressed B ± → D 0 h ± decays and time-integrated CP violation in D 0 → h + h − are presented. 1 Search for New Physics in Bs decays Our current understanding of Bs physics, within the Standard Model (SM) and its sensitivity to New Physics (NP), is derived exclusively from the large Tevatron Run II data samples. One of the most interesting topics in this area is the measurement of Bs mixing phase, βs. This phase is expected to be tiny in the Standard Model (SM): β SM s ∗ ∗ = arg(−VtsVtb /VcsVcb ) ≈ 0.02, (1) and it is unconstrained by the 2006 measurements of the Bs mixing frequency. Presence of NP can lead to large values of this phase which is not excluded experimentally yet. The βSM phase can be accessed through measuring the time evolution of flavor-tagged s Bs → J/ψφ decays, or inclusively by measuring the anomalous mixing rate difference, Ab sl , between Bs and ¯ Bs. Both these methods are pursued at CDF and DØ . Using 5.2 fb−1 and 6.1 fb−1 data samples, respectively, CDF and DØ have performed detailed angular analyses of the Bs → J/ψφ decays to disentangle their CP-even and CP-odd components. Their initial results indicate departure from SM by 0.8σ 1 and 1.1σ 2 , calling for more scrutiny through independent measurements. 1.1 Measurement of BR(Bs → J/ψf0(980)) A simpler way to measure βs is through the study of Bs → J/ψf0(980),f0(980) → π + π − decays. This is a pure CP-odd decay which can provide a clean measurement of βs without a need for angular analysis. As a first step towards this CDF searched for this suppressed decay mode using 3.8 fb −1 data 3 , collected using a di-muon trigger. The search for Bs → J/ψf0(980) decays proceeds through an initial loose selection of µµππ candidates, followed by a Neural Network discrimination, based on kinematic variables,
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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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Page 70 and 71: 2 Searches in the dijet final state
Page 72 and 73: ing that the neutrinos were the onl
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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 104 and 105: ATLAS - consists of four parts (mon
Page 106 and 107: 5 D mesons High cross-sections of D
Page 108 and 109: μ +X') [nb/GeV] → b+X → (pp T
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Page 113 and 114: HEAVY FLAVOUR IN A NUTSHELL Robert
Page 115 and 116: Figure 1: Overlapping constraints o
Page 117: Figure 3: Constraints on new physic
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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 133 and 134: CHARMLESS HADRONIC B-DECAYS AT BABA
Page 135 and 136: surements (fL ∼ 0.5). Several att
Page 137 and 138: Estimating the Higher Order Hadroni
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Page 144 and 145: (a) Tree level signal decay b ¯Bs
Page 146 and 147: the B0 d system LHCb profits from i
Page 148 and 149: This result is based on averaging o
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Page 152 and 153: e M(Dπ) distributions obtained D +
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
Page 161 and 162: where the effective coefficients aA
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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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