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

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Figure 3: Left: An event display in the TPC and TRD. The readout was triggered by the TOF (first trigger level) and confirmed by the TRD trigger (second level). Right: Histogram of the measured flight time between two TOF modules. We subtract L/c, with L the length of the trajectory, and c the speed of light. commissioned in 2008. The FMD (Forward Multiplicity Detector) consists of 3 planes of silicon strip detectors to measure charged particle multiplicities. During the LHC injection tests and beam circulation the FMD was in general recording data and operated as expected at hit densities of 10 to several 10 3 charged particles per cm 2 . The T0 detector serves as time reference for TOF (∼ 30 ps time resolution) and provides vertex measurement. The V0 detector provides a centrality trigger at the first level, serves as a luminosity monitor and can be used to reject beam-gas events. During the LHC injection tests and beam circulation the V0 was in general recording data and for the beam-induced events clear correlations between the measured signal charge and, e.g. the number of fired chips in the SPD were observed. The ZDC (Zero Degree Calorimeter) is composed of four calorimeters, two each to detect protons and neutrons. They are located 115 meters away from the interaction point on both sides, exactly along the beam line. The PMD (Photon Multiplicity Detector) measures multiplicity and spatial distributions of photons in the forward pseudorapidity region. 4 Summary & Conclusions Where possible the detector performance was evaluated using cosmic muons and the first few beam particles delivered by the LHC. All installed detectors are fully commissioned and shown to be performing close to their specifications. The current shutdown period is used to install additional detectors. The ALICE experiment is ready for recording the first proton-proton collisions in the LHC, expected in late 2009, and the collaboration eagerly awaits the first heavy-ion collisions at the end of the upcoming run. References 1. The ALICE Collaboration, Technical proposal for A Large Ion Collider Experiment at the CERN LHC, CERN-LHCC-95-71. 2. F. Carminati et al., ALICE: physics performance report, volumes 1 & 2, J. Phys. G30, 1517 (2004), J. Phys. G32, 1295 (2006). 3. The ALICE Collaboration, K Aamodt et al., JINST 3, S08002 (2008).
COMMISSIONING OF THE ATLAS DETECTOR WITH COSMIC-RAYS AND SINGLE-BEAMS Masaya ISHINO on behalf of the ATLAS collaboration ICEPP University of Tokyo, Tokyo, 113-0033, Japan The ATLAS detector has been commissioned with cosmic rays and the first single beam at the Large Hadron Collider, allowing for the detailed performance studies of each detector subsystem. In this paper, the results of the inner-tracker position alignment with large number of cosmic-ray events are presented. In addition, the single-beam events were used for the timing studies of the level-1 trigger system. The procedure for triggering on the single-beam events and the achieved timing accuracy are reported. 1 The ATLAS detector commissioning The ATLAS detector is being commissioned with cosmic rays since 2005, starting with a small fraction of the full ATLAS system and gradually adding more and more detector components, finally all subsystems were ready for the data taking in summer 2008 1 . The commissioning with cosmic rays allows for the thorough tests of the detector installed in the underground cavern, together with its service systems. Basic studies are focused on the noise level in the detector and amplifier modules, location of hot and dead channels and identification of malfunctioning electronics boards. The test results allow for a regular update of operation parameters, threshold settings and lists of masked channels, as well as for the replacement or repair of the electronics. In this way, the optimal detector operation mode is achieved. Additionally, the trajectories of cosmic-ray particles can be used to align the relative positions of tracking detector modules, as will be shown in section 3. The cosmic-ray events are triggered by the muon trigger chambers, calorimeter triggers and scintillation counters (MBTS), designed to trigger on minimum-bias events. The central trigger processor (CTP) on the first trigger level (level-1) combines the information from these trigger sources and makes the final Level-1 Accept decision (L1A) which is transfered to the frontend electronics of all subsystems. Following the L1A signal, the data buffered in the pipe-line memory are read out, processed by the event builder and recorded to the mass storage space. In order to consistently read out data belonging to the same bunch crossing, it is important that all sub-detectors are timed-in perfectly. In addition to the cosmic rays, the circulation of the single-beam at the Large Hadron Collider (LHC) in September 2008 allowed for additional detector performance tests. During several days, the proton bunches containing 2·10 9 protons of 450 GeV energy were being injected into the LHC ring and circulated without acceleration. During the first day, the whole ATLAS detector system has been illuminated by the particles from the beam-halo. Two trigger systems have been used to record the single-beam signals: the previously mentioned MBTS and the beam pick-up detectors (BPTX) positioned in the beam pipe 175 m upstream of the interaction
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: Figure 2: Performance of the TPC me
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 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
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Figure 1: Coverage of the LEP Higgs
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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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