Lecture LHC How to measure cross sections...

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1 Lecture LHC How to measure cross sections...

2 Cross Section & Luminosity

3 Luminosities in LHC

4 How to measure luminosity

5 Cross Section & Luminosity

6 Methods for Luminosity Measurement - 1 The luminosity L of a pp collider can be expressed as where R inel is the rate of inelastic collisions and σ inel is the pp inelastic cross-section. For a storage ring, operating at a revolution frequency f r and with n b bunch pairs colliding per revolution, this expression can be rewritten as where µ is the average number of inelastic interactions per bunch crossing. ATLAS monitors the delivered luminosity by measuring the observed interaction Rate per crossing, µ vis, independently with a variety of detectors And using several different algorithms. The luminosity can then be written as

7 Methods for Luminosity Measurement - 2 Where σ vis = εσ inel is the total inelastic cross-section multiplied by the efficiency ε of the dete ctor and efficiency and similarly µ vis. Since µ vis is an observable quantity the calibration of the luminosity scale is equivalent to determining the visible cross-section. Methods: Event counting algorithms, count events satisfying selection criteria. In the limit µ vis <<1 then µ vis N/N BC where N selected events, N BC number bunch crossings. In the limit case in which all bunch crossings contain one event passing criteria, then event counting algorithms contain no information about the interaction rate Hit counting algorithm, rather than counting events count hits above some threshold. This approach is much more robust and saturates much more slowly wrt previous method

8 Methods for Luminosity Measurement - 3 The calibration of σ vis is performed using a dedicated method based on beam-separation sc ans, called van der Meer (vdm) method. The dilivered luminosity can be written in terms of a ccelerator parameters as Where n 1 and n 2 are the bunch populations (protons per bunch) and Σ x Σ y are the beam wid ths in the x,y direction. More in the following.

9 Luminosity LHC (old slide) Absolute Methods: Determination from LHC parameters; van-der-meer separation scans... Rate measurement for standard candle processes... LHC Examples: Rate of pp Z/W l [needs: electroweak cross sections]l ll/l ν Rate of pp γγ μμ, ee [needs: QED & photon flux] Optical theorem: σtot ~ Im f(0) [needs: forward elastic and total inel. x-sec] Elastic scattering in Coulomb region... Combination of the above... Relative Methods: Particle counting; using Cherenkov monitors [e.g. ATLAS] [needs to be calibrated for absolute luminosity] Aim: Luminosity accuracy of 2-3%... Accuracy: 2-3% Accuracy: from 10%- To today ~3% Accuracy: 5-10% [PDF knowledge,...] Accuracy: 1%? [TDR; needs forw. tagging] Accuracy: 5-10% [needs σtot; needs forw. instrumentation] TOTEM

10 Luminosity LHC Methods as summarized in ATLAS TDR [ATLAS Technical Design Report, Vol. I]

11 Cross Section & Luminosity Collider experiment: integrated luminosity Φa: flux na : density of particle beam va : velocity of beam particles N. : reaction rate Nb: target particles within beam area σa : effective area of single ' scattering center L : luminosity LHC: Nx ~ 10 11' A ~.0005 mm 2' n ~ 2800' f ~ 11 khz L ~ cm -2 s -1 Na: number of particles per bunch (beam A) Nb: number of particles per bunch (beam B) U : circumference of ring n : number of bunches per beam v : velocity of beam particles f : revolution frequency A : beam cross-section σx : standard deviation of beam profile in x σy : standard deviation of beam profile in y

12 Van-der-Meer Separation Scan Determine beam size... measuring size and shape of the interaction region by recording relative interaction rates as a function of transverse beam separation... N1 Bunch 1 Interaction region Bunch 2 Effective area Aeff N2 [LHC Project Report 1019: H. Burkhardt et al.] Rate [IPAC 2010, S. White et al.] Time First optimization scans at LHC performed for squeezed optics in all IPs [November 2009].

13 External material

14 Bunch current measurements

15 VdM scans in ATLAS

16 ATLAS Beam Profiles Relative Rate [Hz] ATLAS preliminary ATLAS preliminary Δx [μm] Δy [μm] [Scans from May 2010]

17 Profile of VdM scan

18 Systematic errors in luminosity measurement

19 Uncertainties - 1

20 Uncertainties - 2

21 Uncertainties - 3

22 Snapshot of Luminosities uncertainties

23 An alternative approach

24 ATLAS Luminosity detectors

25 Early LHC Luminosity Measurement Particle counting: Charged Tracks (MBTS) Calorimeter deposits (LAR) [Normalization via Monte Carlo]' Forward Particles (LUCID) [Relative Method; normalization to MBTS/LAr]' Same trend! Example Fill Example Fill Total integrated Luminosity 2010

26 Luminosity via Forward Scattering BCM [Beam Condition Monitor] Diamond sensors at z = ±184 cm 4 modules per side LUCID [Luminosity Monitor] Cherenkov gas tubes, at ~17 m from IP. ZDC [Forward Neutrals] W 74 /Quartz calo at 140 m and at 0 toip. ALFA [Absolute Lumi...] Fiber trackers in Roman Pots... at 240 m... AFP [Track & ToF System] LHC Upgrade... at 220 and 420 m... μ-chambers Scattered Proton Tagging Region Barrel Tracking End-cap MBTS BCM Forw. Calo. LUCID TAS TDC/TAN ALFA (eta) TAS: Target Absorber Secondaries TAN: Target Absorber Neutrals

27 ATLAS Forward Region... LUCID vessel MBTS courtesy J.Pinhold LAr End-cap

28 Particle Counting with LUCID Particles creating Cherenkov light Today Present configuration: 2 LUCID detectors; 20 aluminum tubes each [16 directly coupled; 4 via Winston cones] Counting Gas: C4F10 Pressure: bar [Upgrade: 200 tubes/vessel]

29 ALFA Absolute Luminosity for ATLAS Elastic Scattering: Proton dσ/dt Coulomb scattering ( ~ t 2 ) Coulomb-nuclear interference [fitting this region yields L,σtot, ρ and b] γ, Proton Nuclear scattering ( ~exp(-b t ) ) Perturbative QCD ( ~ t 8 ) Elastic Scattering at low t is sensitive to exactly known Coulomb amplitude... σc = σn t = GeV t [GeV 2 ] Shape of elastic scattering distribution can also be used to determine total cross section, σtot, and the parameters ρ and b... Perform fit to: with: Coulomb Scattering Coulomb/nuclear Interference Nuclear Scattering ρ b σtot : ratio of the real to imaginary part ' of the elastic forward amplitude : nuclear slope : total pp X cross section

30 ALFA ALFA Absolute Luminosity for ATLAS Elastic Scattering: ATLAS Proton γ, Proton Parallel-to-point focusing... Protons scattered at angle θ form ellipses at ALFA... [Depends on beam optics] Need proton detection 1.5 mm from beam... Use of Roman Pot detectors..

31 ALFA Absolute Luminosity for ATLAS Collimator Roman Pot Collimator Roman Pot beam Roman Pots, based on modified Totem design, used to move detectors near to stable beam. Detectors in vertical plane only. Calibration: Beam positioning monitors (BPMs) and hit multiplicities used to calibrate detector positions with respect to beam Overlap extrusions used to calibrate distance between upper and lower detectors

32 ALFA Absolute Luminosity for ATLAS

33 ALFA Absolute Luminosity for ATLAS Scintillating fibers in U-V geometry Schematic view of tracker module... Sensitive area with U-V geometry (light blue)... Overlap detectors and fibers (dark blue)... LHC Beam pipe (red)... Single-cladded 0.5 mm square fibers used to track scattered protons detector planes with 64 fibers each... [expected position resolution: 30 μm] Dead region less than 100 μm... Efficiency > 90% per plane...

34 ALFA Absolute Luminosity for ATLAS ALFA Simulated hit distribution

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