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M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward - Sep. 23, 20141 Michele Gallinaro LIP Lisbon (on behalf of the CMS and TOTEM collaborations)

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Presentation on theme: "M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward - Sep. 23, 20141 Michele Gallinaro LIP Lisbon (on behalf of the CMS and TOTEM collaborations)"— Presentation transcript:

1 M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 20141 Michele Gallinaro LIP Lisbon (on behalf of the CMS and TOTEM collaborations) Physics with the CT-PPS project Introduction Exclusive dijets Exclusive WW

2 Introduction M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 20142

3 Introduction M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 20143

4 Simulation Generated events are processed through GEANT4 simulation of CMS central detector, and standard reconstruction chain Protons are tracked through the beam-line to tracking and timing detector position –Simulation includes beam energy dispersion, beam crossing angle, smearing due to beam divergence, vertex smearing Fast simulation of PPS detectors takes into account detector segmentation and resolution –Time resolution of 10ps (baseline) and 30ps (conservative) considered –Tracking detectors: position resolution of 10  m at z=204-214m Beam induced background is included –Simulated event-by-event simulation based on data at PU=9 and extrapolated to PU=25,50 M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 20144

5 Simulated samples Signal –Exclusive dijets: ExHuME generator interfaced with PYTHIA –Exclusive WW: FPMC with HERWIG to simulate decay of WW pair Background –WW inclusive events: PYTHIA, normalized to 13 TeV xsection –SD and DPE use POMWIG interfaced with HERWIG –Multijet QCD events simulated with PYTHIA –Exclusive  events generated with FPMC Pileup –PYTHIA to generate minimum bias samples (incl. diffractive events) –25 and 50 pileup event samples M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 20145

6 Beam optics M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 20146 HECTOR, a fast simulator for particle transport in a beam-line good agreement with MADx Full transport line simulation in CMSSW Horizontal distance to beam center in the z-range of the PPS detectors

7 Detector acceptance M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 20147 Acceptance: X vs Y (includes ,t ellipses) Particle gun (t,ξ,φ) based on HECTOR at √s = 13 TeV

8 WW detector acceptance:  vs t M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 20148 Single arm acceptance: ⇒ ~55% @15  15  20  15  20  Double arm acceptance: ⇒ ~28% @15  acceptance in one arm (z>0) when requiring other proton to be inside the acceptance of the other arm (z<0)

9 WW detector resolution: t,  Compare generated and reconstructed values Resolution of the t and  variables M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 20149 30% 1%

10 Detector resolution: mass Mass acceptance and resolution vs M X PPS selects exclusive systems in 300-1700 GeV range (  >5%) At 15  acceptance larger by a factor of two (wrt 20  ) for lower masses Mass resolution ~1.5% at 500 GeV M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201410 1% dijets WW

11 Machine induced backgrounds Use TOTEM data at  =9 Account for pileup protons (from simulation) to estimate beam background only Extrapolate from  =9 to  =50 M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201411 data simulation  =9  =50 extrapolation

12 Physics processes Exclusive dijets –high jet p T events (M jj up to~400-500 GeV) –test of pQCD mechanism of exclusive production Exclusive WW –quartic gauge boson coupling WW  –sensitivity to anomalous couplings M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201412

13 Exclusive dijets Require 2 jets (p T >100 GeV, |  |<2) Leading protons tagged by PPS Sensitivity to high mass of central system M X (from PPS) Timing as powerful discriminant for exclusive states Kinematical constraints from PPS measurements Signal: ExHuME (pp→gg→dijets) PU: Pythia 8 (MB, PU50, PU25) M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201413 time correlation vs z

14 Kinematical distributions M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201414 leading jet p T  (jet-jet) dijet mass missing mass

15 Kinematical distributions (cont.) M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201415 Dijet mass fraction Rapidity difference of jet and proton systems

16 Track multiplicity Exploit the exclusivity of signal events to discriminate against large QCD multijet background Count number of tracks in regions of  around the jet system M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201416 N tracks (  ) N tracks (  )

17 Track multiplicity (cont.) M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201417 N tracks (  )N tracks (  )

18 Track multiplicity (cont.) M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201418 N tracks (  ) N tracks (  ) exclusive dijetsQCD multijets DPE SD N tracks (  ) ≤ 2 N tracks (  ) ≤ 9 use:

19 Yields per 1/fb – Pileup=50 M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201419 ⇒ S/B ~ 1/8

20 Yields per 1/fb – Pileup=25 M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201420 ⇒ S/B ~ 1/3

21 WW production Study of process: pp→pWWp –Clean process: W in central detector and “nothing” else, intact protons can be detected far away from IP –Exclusive production of W pairs via photon exchange: QED process, cross section well known Events: –WW pair in central detector, leading protons in PPS –Study only e  final state SM observation of WW events –  WW =95.6 fb,  WW (W>1TeV)=5.9 fb Anomalous coupling study –AQGCs predicted in BSM theories –Two points: a 0 W /  2 =5x10 -6, a C W /  2 =5x10 -6 M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201421

22 PPS timing vs. z-vertex M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201422 Use timing to reject background Keep: –~99% of signal events –~10% of inclusive WW Two scenarios: 10ps and 30ps 10ps 30ps exclusive WWinclusive WW

23 Kinematical distributions M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201423 leading lepton p T  (lep-lep) dilepton p T missing mass SM vs AQGC: missing mass provides good separation Information from PPS

24 PPS and central detector M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201424  z(PPS-lepton) # of extra tracks Multiplicity of “extra tracks” associated to dilepton vertex Requiring <10 tracks keeps 80% of signal, 5% of bkg

25 Yields (in fb) M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201425 Select WW events Apply central lepton and PPS acceptance cuts Additional timing and track multiplicity cuts Inefficiency due to overlapping hits in timing detectors is taken into account Number in parenthesis are for time resolution of 30ps

26 Yields vs distance to beam M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201426 Potential enhancement of sensitivity with closer approach: Signal yield grows by ~x2 when going from 15  to 10  Background is more or less flat

27 AQGC yields (in fb) M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201427

28 AQGC expected limits M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201428 Run 1 Run 2 30 ps 10 ps Expected limits @95%CL:

29 Summary Studied physics and detector performance –Timing resolutions of 10ps and 30ps –Distance from beam at 15  and 20  Physics case and impact of PPS Exclusive WW –Exclusive WW via photon-photon interaction (S/B~2:1) –Search for anomalous couplings (S/B~6:1) Exclusive dijets –test of pQCD mechanism of exclusive production –S/B~1/8 for PU=50, and S/B~1/3 for PU=25 PPS improves sensitivity to SM and BSM physics M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201429

30 backup M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201430

31 Distributions of , t M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201431 In PPS acceptance information for signal and background dijets WW

32 Yields in separate mass bins M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201432

33 Detector inefficiency High occupancy in baseline timing detector –Quartic: segmentation 3x3mm 2 Inefficiency due to overlapping hits ~40% –Motivation for R&D on new technologies M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201433

34 Timing detector occupancy Studied occupancy with beam bkg+pileup High occupancy in current Quartic design Studied alternative segmentation M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201434 beam bkg+pileup PU=25 3x3 mm 2 QUARTIC diamond-like

35 M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201435 RP dynamic alignment recoil p maximize the slope Data-driven method maximize the |t|-slope (normalized to max slope)  determine X and Y offsets CDF: PRD 86 (2012) 032009 PRD 86 (2012) 032009

36 Alignment à la Totem Alignment between RP and circulating beam –Requires “special fill” (1 low-intensity bunch) –Once per LHC beam conditions (optics, energy) –Limited by RP movement/unknown window (~300  m) Relative internal detector alignment –Use reconstructed tracks Global alignment using elastic events M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201436 Int. J.Mod.P. A28(2013)1330046

37 Running conditions  ~0.5-0.6m N bunches ~2800 N p ~1.5 x 10 11 E beam =6.5 TeV  =50 L=30-100 (-300) fb -1 RP position wrt beam: 15 (20)  RP tracking position: z= 204/214 m RP timing position: z=216 m RP timing resolution:  =10 (30) ps M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201437

38 Anomalous WW  gauge coupling Quartic anomalous couplings parametrized by a 0 W, a C W –anomalous parameters =0 in SM Cross section enhanced at high mass Different behavior of cross section as function of anomalous coupling Measurement of WW events: 2W and protons tagged in forward detectors M. Gallinaro - "Physics with the CT-PPS project" - LHC Forward WG@CERN - Sep. 23, 201438

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