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

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4. J. Li et al. (Belle Collaboration), Phys. Rev. Lett. 106, 121802 (2011). 5. R. Aaij et al. (LHCb Collaboration), Phys. Lett. B 698, 115 (2011). 6. V. Abazov et al, Phys. Rev. Lett. 105, 081801 (2010). 7. Lenz, Nierste, arXiv:0612167 [hep-ph]. 8. T. Aaltonen et al. (CDF collaboration), Phys. Rev. D 77, 072004 (2008). 9. The CDF Collaboration, CDF Public Note 10335 (2011). 10. Atwood, Dunietz, Soni, Phys. Rev. Lett. 78, 3257 (1997) and Phys. Rev. D 63, 036005 (2001). 11. The CDF Collaboration, CDF Public Note 10309 (2010). 12. Grossman, Kagan, Nir, Phys. Rev. D 75, 036008 (2006). 13. The CDF Collaboration, CDF Public Note 10296 (2010).
Search for B 0 s → µ+ µ − and B 0 d → µ+ µ − at LHCb M.-O. Bettler Istituto Nazionale di Fisica Nucleare (INFN), Sezione Firenze, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland A search for the decays B 0 s → µ + µ − and B 0 d → µ + µ − is performed with about 37 pb −1 of pp collisions at √ s = 7 TeV collected by the LHCb experiment at the Large Hadron Collider at CERN. The observed numbers of events are consistent with the background expectations. The resulting upper limits on the branching fractions are B(B 0 s → µ + µ − ) < 5.6 × 10 −8 and B(B 0 → µ + µ − ) < 1.5 × 10 −8 at 95% confidence level. 1 Introduction Within the Standard Model (SM) the B 0 d → µ+ µ − and B 0 s → µ + µ − flavour changing neutral current transitions are rare as they occur only via loop diagrams and are helicity suppressed a . Their branching fractions (BF) predicted by the SM 1 are B(B 0 s → µ + µ − ) = (0.32 ± 0.02) × 10 −8 and B(B 0 → µ + µ − ) = (0.010 ± 0.001) × 10 −8 . In New Physics models, their BF can be significantly enhanced, although in some models they are lowered. For instance, within the Minimal Supersymmetric SM 2 , the BF can get contributions ∝ tan 6 β/M 4 A , where MA denotes the pseudoscalar Higgs mass and tan β the ratio of Higgs vacuum expectation values. The best published 95% C.L. limits come from the D0 collaboration 3 (6.1 fb −1 ), B(B 0 s → µ + µ − ) < 5.1 × 10 −8 , and from the CDF collaboration 4 (2 fb −1 ), B(B 0 s → µ + µ − ) < 5.8 × 10 −8 and B(B 0 → µ + µ − ) < 1.8 × 10 −8 . CDF has also presented preliminary results 5 with 3.7 fb −1 , that lower the limits to B(B 0 s → µ + µ − ) < 4.3 × 10 −8 and B(B 0 → µ + µ − ) < 0.76 × 10 −8 . The measurements presented in these proceedings use about 37 pb −1 of integrated luminosity collected by LHCb between July and October 2010 at √ s = 7 TeV. 2 The LHCb detector The LHCb detector 6 is a single-arm forward spectrometer with an angular coverage from about 10 mrad to 300 mrad in the bending plane. It consists of a vertex locator, a warm dipole magnet, a tracking system, two RICH detectors, a calorimeter system and a muon system. Track momenta are measured to a precision of δp/p = 0.35 (0.5) % at 5 (100) GeV/c. The RICH system provides charged hadron identification in a momentum range 2–100 GeV/c. Typically, kaon identification efficiencies of over 90% can be attained for a π → K fake rate below 10%. The calorimeter system identifies high transverse energy (ET) hadron, electron and photon a In this proceedings the inclusion of charge-conjugate states is implicit.
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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
Page 75 and 76: The Quasi-Classical Model in SU(N)
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Page 79: 3. Top
Page 82 and 83: of their vertex with respect to the
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 94 and 95: momentum direction of the b quark f
Page 96 and 97: Events 200 150 100 50 -1 DØ L=5.4
Page 98 and 99: after all corrections in the M t¯t
Page 100 and 101: for prompt J/ψ under the fully tra
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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 and 118: Figure 3: Constraints on new physic
Page 119 and 120: RECENT B PHYSICS RESULTS FROM THE T
Page 121 and 122: (IP) distributions are fitted separ
Page 123: decays CDF extracts Using a 5.94 fb
Page 127 and 128: Ref. 10,11 . The expected GL distri
Page 129 and 130: IN PURSUIT OF NEW PHYSICS WITH B DE
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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 141: The counterpart of the ground-state
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
Page 150 and 151: y non-perturbative effects. Using t
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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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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