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

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Events/5 GeV 6 10 5 10 4 10 3 10 2 10 10 1 -1 DØ preliminary, 8.2 fb data * Z/ γ ->ee jet+jet γ+jet γγ Signal x 50 -1 10 60 80 100 120 140 160 180 200 Mγγ [GeV] Events/0.08 7 10 6 10 5 10 4 10 3 10 2 10 10 1 -1 10 -1 DØ preliminary, 8.2 fb data background signal (M =110GeV) x 50 H 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -2 10 -1 -0.8 -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 0.8 1 MVA output Figure 5: Left: Diphoton mass distribution for the H → γγ search channel at D0. Right: Output of the final multivariate discriminant for mH = 110 GeV. improve our sensitivity to a Higgs boson signal beyond the expected gains from simply adding new events to our data set. With the full Tevatron data set analyzed, we expect to exceed 95% CL exclusion sensitivity for all allowed values of mH and will be pushing for 3σ signal sensitivity at mH = 115 GeV. Acknowledgments We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work was supported by DOE and NSF (USA), CONICET and UBA- CyT (Argentina), CNPq, FAPERJ, FAPESP and FUNDUNESP (Brazil), CRC Program, CFI, NSERC and WestGrid Project (Canada), CAS and CNSF (China), Colciencias (Colombia), MSMT and GACR (Czech Republic), Academy of Finland (Finland), CEA and CNRS/IN2P3 (France), BMBF and DFG (Germany), Ministry of Education, Culture, Sports, Science and Technology (Japan), World Class University Program, National Research Foundation (Korea), KRF and KOSEF (Korea), DAE and DST (India), SFI (Ireland), INFN (Italy), CONACyT (Mexico), NSC (Peoples Republic of China), FASI, Rosatom and RFBR (Russia), Slovak R&D Agency (Slovakia), Ministerio de Ciencia e Innovación, and Programa Consolider-Ingenio 2010 (Spain), The Swedish Research Council (Sweden), Swiss National Science Foundation (Switzerland), FOM (The Netherlands), STFC and the Royal Society (UK), and the A.P. Sloan Foundation (USA). References 1. F. Englert and R. Brout, Phys. Rev. Lett. 13, 321 (1964). 2. P. Higgs, Phys. Rev. Lett. 13, 508 (1964). 3. G. Guralnik, C.R. Hagen and T.W.B. Kibble, Phys. Rev. Lett. 13, 585 (1964). 4. LEP Electroweak Working Group, http://lepewwg.web.cern.ch/LEPEWWG/ 5. ALEPH, DELPHI, L3, and OPAL Collaborations, The LEP Working Group for Higgs Boson Searches, Phys. Lett. B 565, 61 (2003). 6. T. Aaltonen et al. (CDF and D0 Collaborations), FERMILAB-CONF-10-257-E (2010). 7. T. Aaltonen et al. (CDF and D0 Collaborations), Phys. Rev. Lett. 104, 061802 (2010). 8. V.M. Abazov et al. (The D0 Collaboration), D0 Note 6171-CONF (2011). 9. V.M. Abazov et al. (The D0 Collaboration), D0 Note 6170-CONF (2011). 10. V.M. Abazov et al. (The D0 Collaboration), D0 Note 6177-CONF (2011). 11. A. Hoecker et al., arXiv:physics/0703039 (2007). 300 250 200 150 100 50
SEARCHES FOR HIGH-MASS SM HIGGS AT THE TEVATRON R. LYS ÁK (ON BEHALF OF THE CDF AND D0 COLLABORATION) Division of Elementary Particle Physics, Institute of Physics, Na Slovance 9, 182 21 Prague, Czech Republic The Tevatron searches for a standard model (SM) high-mass Higgs boson in p¯p collisions at center-of-mass energy of √ s = 1.96 GeV are presented. No significant excess over expected background is observed. Therefore 95% C.L. limits are set for SM Higgs production in mass range between 110 GeV/c 2 and 200 GeV/c 2 . For the first time, both experiments now exclude individually a certain SM Higgs boson mass range. CDF excludes SM Higgs boson mass of 158 ≤ mH ≤ 168 GeV/c 2 using data corresponding up to 7.1 fb −1 of luminosity while D0 excludes the range of 163 ≤ mH ≤ 168 GeV/c 2 based on an integrated luminosity up to 8.2 fb −1 . 1 Introduction In the standard model of particle physics the Higgs mechanism plays a central role in the unification of electromagnetic and weak interactions since it is responsible for electroweak symmetry breaking, thereby giving mass to the W and Z bosons. It predicts a scalar Higgs boson whose mass is not predicted. Its special property to couple strongly with heavy particles makes him particularly hard to produce. Before the Tevatron, the experiments performed at LEP put direct limit on the mass of the SM Higgs: mH > 114 GeV/c 2 at 95% confidence level 1 a . The precise indirect measurements performed at LEP and by SLD and Tevatron experiments put the boundary from above: mH < 185 GeV/c 2 when taking into account also LEP direct search limit 2 . Therefore we know where to concentrate when searching for the Higgs boson. Tevatron CDF and D0 experiments have been searching for the Higgs bosons for many years now. The upper limits on SM Higgs production cross section were obtained by both collaborations during the last summer (2010). In high mass region, CDF experiment placed the a All limits given in this paper are at 95% confidence level (C.L.).
Page 1 and 2: 2011 QCD and High Energy Interactio
Page 3 and 4: Proceedings of the XLVIth RENCONTRE
Page 5 and 6: 2011 RENCONTRES DE MORIOND The XLVI
Page 7 and 8: Foreword Contents 1. Higgs Searches
Page 9: 1. Higgs
Page 12 and 13: 95% CL Limit/SM 10 1 Tevatron Run I
Page 16 and 17: Events / 0.5 CDF Run II Preliminary
Page 18 and 19: For the most sensitive sub-channel
Page 20 and 21: Table 1: Table listing the various
Page 22 and 23: various SM Higgs mass hypotheses. T
Page 24 and 25: constraints on parameters are given
Page 26 and 27: Figure 2: Invariant mass of the ele
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Page 30 and 31: Table 1: Main phases of 2010 commis
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Page 36 and 37: 2 QCD Analysis settings HERA PDFs a
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Page 40 and 41: SM σ / σ 95% CL Limit on 3 10 2 1
Page 42 and 43: NNLO σ/ σSM 95% CL Upper Bound on
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Page 46 and 47: 2.3 The impact of different PDF par
Page 49 and 50: SUSY Searches at the Tevatron Ph. G
Page 51 and 52: on the quality (loose or tight) and
Page 53 and 54: SUSY searches at ATLAS N. Barlow, o
Page 55 and 56: channel. These results are combined
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Page 59: 2010 data. Analysis techniques for
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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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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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