2009 QCD and High Energy Interactions - Rencontres de Moriond ...

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2.4 Inclusive H → ττ and H → γγ Searches Both CDF and DØ combine searches with one or more τ candidates in the final state to search for the Higgs. CDF recently completed an analysis with 2.0 fb −1 in the inclusive ττ+X final state. In this channel, the Higgs may be produced in association with a W/Z boson, directly through gluon-gluon fusion, or through vector boson fusion. This analysis uses a neural network trained against the large QCD multijet background as well as separate networks to discriminate t¯t and Z → ττ events. Combining these networks, CDF excludes 31 times the SM prediction for mH = 115 GeV/c 2 . DØ combines their WH → τνbb and inclusive H → ττ + X analyses both using 1.1 fb −1 setting limits of 27 times the SM prediction also for a 115 GeV/c 2 Higgs mass. DØ recently updated a analysis with 4.2 fb −1 searching for the Higgs boson decaying to a diphoton pair. The diphoton mass distribution is divided into ±15 GeV mass windows surrounding the assumed Higgs mass and fit to the observed data resulting in a limit of 13 times the SM prediction for mH = 115 GeV/c 2 Higgs mass. 3 Combined Higgs Mass Limits Because no one Higgs search is sensitive to the SM predicted cross section all searches are combined to maximize sensitivity. Details of the statistical combination can be found in 3 . By combining all available results, we expect to exclude a Higgs production cross section slightly below three times the SM prediction for all masses between 115 and 150 GeV/c 2 . The observed value for mH = 115 GeV/c 2 is 2.5 times the SM prediction. Assuming each experiment collects 2-3 times the currently available integrated luminosity and all analyses incorporate expected improvements, the Tevatron hopes to exclude at 95% CL all Higgs masses 114 and 150 GeV/c 2 by the end of Run II. However, it is unlikely that a 3σ evidence claim can be made with the full dataset if the Higgs mass is above 125 GeV/c 2 and below 145 GeV/c 2 . 4 Summary We have presented recent results from the low mass Higgs searches performed by the CDF and DØ experiments. Using up to 4.2 fb −1 of Run II data, the combined limit on standard model Higgs production is 2.5 times the predicted value for a 115 GeV/c 2 Higgs keeping hope alive that a low mass Higgs may be seen or otherwise will be excluded by the combined Tevatron search in the near future. Acknowledgments We would like to thank the organizers of the XLIVth Rencontres de Moriond for a wonderful conference with excellent presentations. We also wish to thank the organizers for the generous lodging grant making it possible for these results to be presented. Finally, we also wish to thank the CDF and DØ collaborations for the results presented at this conference. References 1. G. Abbiendi, et al, “Search for the Standard Model Higgs boson at LEP” Phys. Lett. B 565:61-75 (2003) 2. LEP Electroweak Working Group, http://lepewwg.web.cern.ch/LEPEWWG (2008) 3. Information about the Tevatron combination can be found at the following website http://tevnphwg.fnal.gov/results/SM Higgs Winter 09
SEARCHES FOR A HIGH MASS STANDARD MODEL HIGGS BOSON AT THE TEVATRON S. PAGAN GRISO (for CDF and DØ Collaborations) INFN and University of Padova, Department of Physics G. Galilei, Via Marzolo 8,35131 Padova, Italy Higgs boson searches are commonly considered one of the main objectives of particle physics nowadays. The latest results obtained by the CDF and DØ collaborations are presented here when seatching for Higgs boson decaying into a W-boson pair, currently the most sensitive channel for masses greater than 130 GeV. The presented results are based on an integrated luminosity that ranges from 3.0 to 4.2 fb −1 . No significant excess over expected background is observed and the 95% CL limits are set for a Standard Model (SM) Higgs boson for different mass hypotheses ranging from 100 GeV to 200 GeV. The combination of CDF and DØ results is also presented, which exclude for the first time a SM Higgs boson in the 160 < mH < 170 GeV mass range. 1 Higgs searches at the Tevatron Hadron colliders collision data can be used to probe Standard Model (SM) theory in several sectors. Data collected at the p¯p Tevatron collider operating at √ s = 1.96 TeV has been useful for both re-enstablish or improve previous important measurements and to make new important discoveries, looking for processes whose cross section range by several orders of magnitude. CDF and DØ experiments 1 2 are collecting data since 2002 and nowadays they have around 5.4 fb −1 of good data available for analysis. The Higgs searches presented here are based on an integrated luminosity that goes from 3.0 to 4.2 fb −1 depending on the specific analysis. According to SM, Higgs boson is produced at Tevatron energies by four main production mechanisms, for a total cross-section of about 0.6 pb a . The dominant mechanism is via gluon fusion and fermionic loop (∼ 86%), then there is the production with a W or Z boson (∼ 15%) and finally by vector-boson fusion (VBF). a Higgs boson properties depend on its mass, which is not predicted inside the SM framework; here and whenever not explicitly mentioned in the following, numbers refer as an example to an Higgs boson of mass mH = 160 GeV.
Page 1 and 2: 2009 QCD and High Energy Interactio
Page 3 and 4: Proceedings of the XLIVth RENCONTRE
Page 5 and 6: 2009 RENCONTRES DE MORIOND The XLIV
Page 7 and 8: Foreword Contents 1. LHC and LHC de
Page 9: 11. Heavy Ions The RHIC beam energy
Page 13 and 14: ALICE COMMISSIONING: GETTING READY
Page 15 and 16: Figure 2: Performance of the TPC me
Page 17 and 18: COMMISSIONING OF THE ATLAS DETECTOR
Page 19 and 20: Figure 2: (Left) Trigger timing dis
Page 21 and 22: Commissioning of the CMS Detector M
Page 23 and 24: In the DTs the worst resolution val
Page 25 and 26: THE LHCB COMMISSIONING S. DE CAPUA
Page 27 and 28: due to the limited capacity of the
Page 29: References 1. LHCb collaboration, A
Page 32 and 33: line in which the cable travels, re
Page 34 and 35: • The QPS snapshot method which u
Page 36 and 37: 6 Conclusions The seriousness of th
Page 39 and 40: Searches for a low mass SM Higgs at
Page 41: Number of Events 4.5 4 3.5 3 2.5 2
Page 45 and 46: Table 1: Number of expected and obs
Page 47 and 48: SEARCHES FOR BSM HIGGS AT THE TEVAT
Page 49 and 50: s c → + H with all b) + H → B(t
Page 51 and 52: HIGGS SEARCHES AT CMS AND ATLAS J.
Page 53 and 54: Luminosity [fb −1 ] 10 9 8 7 6 5
Page 55 and 56: LIGHT HIGGS SEARCHES AT THE LHC USI
Page 57 and 58: dN/dm [arbitrary units] 16000 12000
Page 59 and 60: Higgs and Beyond the Standard Model
Page 61 and 62: •Mass&widthininvisibledecays:Deta
Page 63 and 64: attheLHCwithforwardprotontaggers[25
Page 65 and 66: HIGGSBOUNDS a : CONFRONTING ARBITRA
Page 67 and 68: Figure 1: Coverage of the LEP Higgs
Page 69 and 70: ALL-ORDER CORRECTIONS TO HIGGS BOSO
Page 71 and 72: [fb] j σ 600 500 400 300 200 100 0
Page 73 and 74: STRONGLY INTERACTING GAUGE BOSON SY
Page 75 and 76: where mZZ is the invariant mass of
Page 77: 3. Light Mesons
Page 80 and 81: spectrum with background components
Page 82 and 83: 4 Conclusions The KLOE data set, to
Page 84 and 85: TABLE I: The branching fractions of
Page 86 and 87: FIG. 6: The K 0 SK ± π ∓ (a) an
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Figure 1: The representation of the
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Figure 3: Standard Model (left) and
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References 1. KLOE Collaboration, J
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Events/(0.005 GeV) 500 400 300 200
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) -1 (ps 0.6 0.4 0.2 0.0 -0.2 -0.4
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oppositely-charged tracks are requi
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2 Events per 0.010 GeV/c 2 Events p
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anching fraction of B + → Λ ¯
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3.3 Study of ¯ B → Ξc ¯ Λ −
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een done for B0 decays to the V V f
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1 - CL 1.0 0.8 0.6 0.4 0.2 CKM f i
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1.1 X(3872) Amongst the other state
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(and averaged) Υ − ηb hyperfine
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M 2 (π + ψ’), GeV 2 /c 4 Events
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Table 1: Properties of Y (1 −−
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which then decays to Υ(1S), ii) in
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Figure 3: The center of mass energy
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2 Candidates/5 MeV/c 2 Candidates/5
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decay. For each trial, the most sig
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4. chiral extrapolation to the phys
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apex of the CKM unitarity triangle.
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to update measurements of the branc
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We searched for all the above γ+ p
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2 Bottomonium Hyperfine Splitting i
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References 1. A. Pineda and F.J. Yn
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Table 1: D 0/+ semileptonic branchi
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Figure 2: Missing-mass-squared dist
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Table 1: The measured branching fra
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and 3.872 GeV. We observe an anomal
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2 B 0 s ) 2 Events / ( 5 MeV/c 80 6
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Table 1: The branching fractions (B
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(pb/GeV) µ T / dp d σ 10 1 (a) -1
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cc HERA F2 - x = 0.00003 (× 4 20 (
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2 Events/10 MeV/c CMS Preliminary 9
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ATLAS developed a strategy for the
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ÌÎ × Ð ÑÓÐ ÓÖ ÒÙØÖÒÓ
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× Û ÛÓÙÐ Ø×Ø Ø Ø ÁÄ
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form of the Kähler potential, K =
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4 Cosmological vacuum selection 9 T
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NON-SUSY SEARCHES AT THE TEVATRON A
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Figure 2: Key distributions for the
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MODEL INDEPENDENT SEARCHES FOR NEW
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state shows an excess of data compa
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Searches for new phenomena at CMS a
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[GeV] 1/2 m 1000 800 600 400 200 ~
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Multi-muon events at CDF F. Ptochos
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which tracks are required to have h
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(cm) s d 2 1.5 1 0.5 0 0.5 1 d (cm)
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Search for Excess Dimuon Production
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ε( µ ) / 0.5 GeV/c 1 0.95 0.9 0.8
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6. Top
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(1) dileptons, kinematic based appr
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Theoretical computation mt (GeV) NL
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just four years ago. Improved metho
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Table 1: Recent mt measurements by
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Table 2: Measurements of MW using t
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Figure 1: The three SM single top p
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[pb] l, top dσ/d p T -2 10 -3 10 -
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2 Motivation Studies of single top
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DØ estimates the significance of t
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2 Properties of Top Quark Pair Prod
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4 Conclusions A number of propertie
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2 ∆ χ 12 10 8 6 4 2 0 LEP exclus
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[GeV] ± H M 700 600 500 400 300 20
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one another by swapping one t → W
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Events/4 GeV 250 200 150 100 50 ATL
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integrated luminosity. With Ldt =
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6 σ[pb] 5 4 3 2 1 0 0.1 1 µ/mt p
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4 Conclusions In this talk we discu
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(FCNC), can alter this branching ra
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C.L. that range from 48 times the S
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RECENT RESULTS ON JET PHYSICS AT TH
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Figure 3: (left) The measured integ
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PHOTON+JET PRODUCTION AT √ s=1.96
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(pb/GeV) jet dy dy dp T 3 d 3 1
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Jet Studies at CMS and ATLAS Konsta
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the QCD predictions at transverse m
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Monte Carlo methods for robust erro
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Monte Carlo replicas 100 10 1 0.1 0
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Aspects of Jet Production with PHEN
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Figure 3: Example of a di-hadron co
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Jet physics and strong coupling at
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σσ σ σ σ σ
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W/Z+Jets and W/Z+Heavy Flavor Jets
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[1 / GeV] * jet) Z/ γ nd d σ d p
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DIBOSON PRODUCTION CROSS SECTIONS A
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TGCs are −1.09 < ∆κZ < 1.40,
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LEPTON STUDIES WITH ATLAS AND CMS E
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Events/GeV 3500 3000 2500 2000 1500
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Multi-jet cross sections at NLO wit
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dσ / dE T [ pb / GeV ] 10 -1 10 -2
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Two-loop multi-gluon amplitudes in
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So the matching between Wilson loop
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HIGHER-ORDER QCD CORRECTIONS FOR VE
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The universal exponent GN contains
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MEASUREMENT OF THE UNDERLYING EVENT
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Average Charged pT versus Charged M
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MINIMUM BIAS AND UNDERLYING EVENT S
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Table 1: Efficiencies of selected A
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4 Conclusion The revised LHC progra
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2.1 Charmonia constrains to the had
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this suppression can be attributed
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The second harmonic term (v2) means
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shows the comparison of invariant c
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oadening BT and BW, C-parameter C a
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10 −2 assuming partially correlat
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ÁÆÄÍÁÆÌÀÄÇÆÁÌÍÁÆÄ
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xf 1 2 2 Q = 10 GeV 0.8 ZEUS-JETS F
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HIGH Q 2 CROSS SECTIONS, ELECTROWEA
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Unpolarised neutral and charged cur
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Selected Recent HERMES results on P
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2 sin(+S ) h UT 2 sin(+S ) h UT 0.2
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Recent Spin Results from STAR Andre
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and simulation agree well over a la
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SPIN RESULTS FROM THE PHENIX DETECT
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LL A 0.1 0.08 0.06 0.04 0.02 0 Run2
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DIFFRACTION PHYSICS AND LUMINOSITY
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The luminosity is also reduced if t
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DIFFRACTIVE W AND Z PRODUCTION AT T
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3 Diffractive W and Z Measurement T
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DIFFRACTION AT H1 AND ZEUS P. J. LA
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z⋅singlet(z) z⋅singlet(z) 0.2 0
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Introduction Recent results of the
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the very high correlation (-0.93) o
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9. Lattice
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guidance for BSM strongly coupled t
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z , ψ 2 ξ 1 2 z , ψ 3 3 3 λ χ
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For many years calculations were pe
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with the hadron spectrum observed i
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troublesome is the latter. We have
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which is an essential ingredient fo
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where H is the radiator function, d
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1400 1200 1000 800 600 400 ¾( e e
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THE TOTEM EXPERIMENT AT THE LHC G.
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3 Physics Programme The physics goa
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JETS IN THE FORWARD REGION AT THE L
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to all orders in αs. The approach
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Investigation of Hadronic Interacti
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[VEM] µ S 30 25 20 15 10 5 0 0 200
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Forward physics : from SPS to LHC,
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inelastic cross section (mb) 700 60
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11. Heavy Ions
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uncertainties canceling, to first o
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local parity violation in strong in
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AA I 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.
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hadronic calorimeter, so only neutr
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of 0 < ηtrig < 1.5. Associated par
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In Fig. 3(b), the integrated ridge
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Figure 1: (Color online) Left panel
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limit to free streaming of particle
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9 8 7 6 5 4 3 2 0.4 0.6 0.8 1.0 1.2
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1.2 1.0 0.8 0.6 0.4 0.2 0.0 χ l /T
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2 The Model To describe the J/ψ pr
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We have used PHENIX measurements of
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particle production due to the fact
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10 9 8 7 6 5 4 3 2 1 0 parton dN d
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• Decomposition of the correlatio
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C(k*) 1.4 1.35 1.3 1.25 1.2 1.15 1.
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z)]ûλφi(z,ρ)/ √ 2Ei (hereafte
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m2 D . Approximately such a chromom
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at t = −∞ and ends in a vacuum
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In heavy ion collisions this curren
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Tevatron will provide a contingency
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with respect to the amount of data
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MORIOND 2009, QCD AND HIGH ENERGY I
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nium and bottomonium spectroscopy a
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π + π− decay planes in the meso
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hard scattering process which can b
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scale, lepton energy resolutions, r
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tb tqb W tt Event
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π0 ALL 0.06 0.04 0.02 0 −0.02 GR
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ThePHENIXexperiment has measured as
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massspectruminmultijet+E miss T fin
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epresentsthefirstexclusionbeyondthe
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50. E.G.Ferreiro,Coldnuclearmattere
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2.0 1.5 1.0 0.5 0.0 ρ K* φ mass [
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Jäger 22 discussed pp → V V jj,
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2 ∆ χ 12 10 8 6 4 2 0 LEP exclus
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5 Beyond the Standard Model Two kin
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and in designing experimental analy
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arXiv:0902.2245 [hep-th]. 50. Z. Be
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Martinez Mario ICREA - IFAE Spain m
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