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

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tracking accuracy. In September and October 2008, about 2.7 million cosmic-ray tracks are recorded under nominal settings of the solenoidal and toroidal magnetic fields. The main trigger source for cosmic-ray particles is the level-1 muon trigger with a nominal rate of about 300 Hz. However, only a small fraction of these tracks is traversing the inner detector. In order to study the alignment of the Pixel and SCT system, additional trigger requirement is introduced, selecting only events with more than one track in the inner-tracker region. The selection is a softwarebased algorithm with an online event selection in the frame of the level-2 trigger. In this way, more than 30% of events triggered by the level-1 muon trigger can be used for the SCT alignment and about 7% of them for the Pixel subsystem. The residual distribution for the barrel region of the Pixel and SCT subsystems is shown in Figure 3. The residual is defined as the difference between the measured hit position in a given module and the expected hit point obtained from the track extrapolation. The x-direction corresponds to the main bending direction of the track. The pixel size is 50 µm, the SCT strip width is 80 µm. Only the particles with transverse momentum larger than 2 GeV/c and passing near the interaction point (|d0|
Commissioning of the CMS Detector M. GIUNTA on behalf of the CMS Collaboration INFN & University of Bologna, Italy The status of the commissioning of the CMS detector is summarized and some of the achievements of the past year are highlighted. Preliminary results presented in this note used the big amount of cosmic data collected during 2008 and events produced by the first LHC beams. 1 Introduction The Compact Muon Solenoid 1 (CMS) is one of the four experiments operating at the CERN Large Hadron Collider (LHC). A schematic view of the detector is shown in Fig. 1. The tracking system is made of a pixel detector close to the beam pipe surrounded by a silicon strip detector: its high granularity (70 millions pixels, 10 millions strips) and precision ensures good track reconstruction efficiency. It is placed inside a 3.8T superconducting solenoid together with the electromagnetic calorimeter (ECAL), made of lead tungstate crystals, and the brass-scintillator sampling hadronic calorimeter (HCAL). Forward sampling calorimeters increase the pseudorapidity coverage up to |η| ≤ 5. The magnet return yoke is instrumented with 4 stations of muon chambers: Drift Tubes (DT) in the barrel region, Cathode Strip Chambers (CSC) in the endcap, Resistive Plate Chambers (RPC), providing a better time resolution, in both; they cover most of the 4π solid angle. Very-forward Calorimeter Hadronic Calorimeter Electromagnetic Calorimeter Compact Muon Solenoid Superconducting Solenoid Silicon Tracker Pixel Detector Preshower Figure 1: Schematic view of the CMS Detector Muon Detectors
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: Figure 2: (Left) Trigger timing dis
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 and 42: Number of Events 4.5 4 3.5 3 2.5 2
Page 43 and 44: SEARCHES FOR A HIGH MASS STANDARD M
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
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[fb] j σ 600 500 400 300 200 100 0
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STRONGLY INTERACTING GAUGE BOSON SY
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where mZZ is the invariant mass of
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3. Light Mesons
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spectrum with background components
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4 Conclusions The KLOE data set, to
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TABLE I: The branching fractions of
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FIG. 6: The K 0 SK ± π ∓ (a) an
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4. Heavy Flavours
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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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