MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn,...
-
Upload
junior-rogers -
Category
Documents
-
view
217 -
download
0
Transcript of MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn,...
![Page 1: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/1.jpg)
MEIC Simulation and Reconstruction Group Report
Tanja Horn
1Tanja Horn, CUA ColloquiumTanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
![Page 2: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/2.jpg)
• Gluon and sea quark (transverse) imaging of the nucleon
• Nucleon Spin (G vs. ln(Q2), transverse momentum)
• Nuclei in QCD (gluons in nuclei, quark/gluon energy loss)
• QCD Vacuum and Hadron Structure and Creation
• Electroweak Physics
EIC@JLab Science SummaryEIC@JLab Science Summary
Energies s luminosity
EIC@Jlab Up to 11 x 60 150-2650 Few x 1034
Future option Up to 11 x 250 11000 1035
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
2
![Page 3: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/3.jpg)
Simulation WorkSimulation Work
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
• Nucleon spin
– FL(x, Q2)
– g1(x, Q2), ΔG/G, gp1-gn
1
– Gluon/quark transverse imaging (exclusive diffractive channels)
• Flavor Decomposition and transverse structure– Quark polarization Δq(x): Δu/u, Δd/d, Δs/s, Δu/u, Δd/d, Δs/s, Δu-Δd
– Transverse sea quark imaging (exclusive non-diffractive channels)
– Transverse parton momenta (Mulders, Sivers, Transversity)
• Nuclear Medium
– FLA(x, Q2)
– pT2
3
![Page 4: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/4.jpg)
Activities of the Simulation Working Activities of the Simulation Working GroupGroup
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
• Event Generators (standardized format)– Rate predictions including simulations of the detector restrictions
– Input for detector design
o Momentum and angular distributions for various particles
• Fast MC– Input: resolution function
• GEANT MC– Based on the CLAS12 simulation package GEMC
• Event Reconstruction/Tracking (for GEANT data)
4
![Page 5: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/5.jpg)
Exclusive Processes: EIC SimulationsExclusive Processes: EIC Simulations
Diffractive Channels
– Data experience from HERA, COMPASS
o γp(DVCS), ρ°p, φp, J/Ψp
– DVCS simulations [A. Sandacz 06/07]
Non-diffractive Channels
– New territory for a collider!
– Much more demanding in luminosity
– Feasibility studies: π+n, π°p, K+Λ
5Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
![Page 6: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/6.jpg)
• J/Ψ rate estimate uses a model based on a photoproduction parameterization
– Branching ratio of 0.06 into e+e- (or μ+μ-) has been included in rate estimates
Models and rate estimates: Models and rate estimates: J/J/ΨΨ and and DVCSDVCS
[Sandacz, Hyde, Weiss ’06/07+]
• Gluon size directly probed by J/Ψ and φ production (Q2>10 GeV2)
– Require full t-distribution Fourier– Powerlike at |t|>1GeV2?
• Do singlet quarks and gluons have the same transverse distribution?
Gluon size from J/Ψ, singlet quark size from DVCS
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
6
![Page 7: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/7.jpg)
Exclusive Generators: Exclusive Generators: ππ++/K/K++
e p π+ n
e p K+ Λ
[T. Horn with summer student: D. Cooper ’08]
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
7
Pushes for high luminosity ~1034 and lower and more symmetric energies
• Simulation for charged + production, assuming 100 days at a luminosity of 1034, with 5 on 50 GeV (s = 1000)
• Pion cross section models:– Ch. Weiss: Regge model– T. Horn: π+ empirical parameterization
• Kaon cross section model:– T. Horn: K+ empirical parameterization
based on DESY, Cornell, JLab data
• Do strange and non-strange sea quarks have the same spatial distribution?
![Page 8: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/8.jpg)
Exclusive Generators: Exclusive Generators: φφ and and ρρ
8Tanja Horn, CUA Colloquium
• Simulation generates φ and ρ events w/:– Φ: parameterization of σL based on a
calculation by Kroll-Goloskokov including a branching ratio of 0.492 into K+K- in rate estimate
– ρ: parameterization by A. Sandacz based on NMC data, valid for Q2>1 GeV2
[Horn, Weiss 09]
Transverse spin
x
slower
quarks move faster
x
Asy
mm
etry
• Deformation of transverse distribution by transverse polarization of nucleon
– Helicity flip GPD E, cf. Pauli ff [M. Burkhardt]
• EIC: exclusive ρ and φ production with transversely polarized beam
– Excellent statistics at Q2>10 GeV2
– Transverse polarization natural for collider
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
8
![Page 9: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/9.jpg)
4 on 250 GeV4 on 50 GeV
diff
ract
ive
DIS
• Both processes produce high-momentum mesons at small angles
• For exclusive reactions, this constitutes our background
Diffractive and SIDIS (TMDs)[W. Foreman 09]
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
9
![Page 10: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/10.jpg)
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
[Horn 08+]recoil baryonsscattered electronsmesons
4 on
250
GeV
4 on
30
GeV
t/t ~ t/Ep
Θ~√t/Ep
PID challenging
very high momenta
electrons in central barrel, but p different
0.2° - 0.45°
0.2° - 2.5°
ep → e'π+n
Exclusive light meson kinematics
10
![Page 11: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/11.jpg)
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
recoil baryonsscattered electronsmesons
no Q
2 cut
Q2 >
10
GeV
2
t-distribution unaffected
forward mesons: low Q2, high p
low-Q2 electrons in electron endcap
high-Q2 electrons in central barrel:
1-2 < p < 4 GeV
mesons in central barrel:
2 < p < 4 GeV
ep → e'π+n
Beam divergence
Θ~1/√β*
Low (J/Ψ) vs. high Q2 (light mesons) – 4 on 30 [Horn 08+]
11
![Page 12: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/12.jpg)
DES at higher electron energies4 on 30 5 on 50 10 on 50
• With 12 GeV CEBAF, EIC@JLab has the option of using higher electron energies– DIRC no longer sufficient for π/K separation
• DIRC needs to be complemented by gas Cherenkov or replaced by dual radiator RICH to push the limit above 4 GeV
Mo
me
ntu
m (
Ge
V/c
)
Lab Scattering angle (deg) Lab Scattering angle (deg) Lab Scattering angle (deg)
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
12
![Page 13: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/13.jpg)
Decaying particles: Decaying particles: π°π°
Tanja Horn, CUA Colloquium
[T. Horn with summer student: K. Henderson]
1° → 35mm / 2m
• Opening angle is small and requires fine calorimeter granularity
– JLab/BigCal: 38x38mm, H1 forward calorimeter: 35x35mm
Op
enin
g A
ng
le
(deg
)
π° Lab Angle (deg)
• Separating the π° decay photons is getting more difficult as the energy increases, but pion momenta are low at high Q2
Similar to π+, but photon opening angle places a constraint on the calorimetry
π° γγ • Monte Carlo generates π° events with subsequent decay
– Cross section model based on a parameterization of NMC data
π° Lab Angle (deg)
Op
enin
g A
ng
le
(deg
)
3 on 30
5 on 50
10 on 250
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
13
![Page 14: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/14.jpg)
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
Decaying particles: Decaying particles: ρ°ρ°
14
T. Horn with summer student B. Pollack
e p ρ° p
ρ° π+π-
ρ°
14
Q2>10
Q2>10
Q2>10, x<0.1
Q2>10, x<0.1
![Page 15: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/15.jpg)
15
• If DIRC is used, configuration on left side may need adjustment to make space for readout
Central detector layout
ions
electrons
EM
Cal
orim
eter
Had
ron
Cal
orim
eter
Muo
n D
etec
tor
EM
Cal
orim
eter
Solenoid yoke + Hadronic Calorimeter
Solenoid yoke + Muon DetectorTOF
HT
CC
RIC
H
LTCC / RICH
Tracking
5 m
• TOF (5-10 cm)
• DIRC (10 cm) ?
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
15
Focus on solenoid
![Page 16: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/16.jpg)
Solenoid Fields - Overview
Experiment Central Field Length Inner Diameter
ZEUS 1.8 T 2.8 m 0.86 m
H1 1.2T 5.0 m 5.8 m
BABAR 1.5T 3.46 m 1.4 m
BELLE 1.5T 3.0 m 1.7 m
GlueX 2.0T 3.5 m 1.85 m
ATLAS 2.0T 5.3 m 2.44 m
CMS 4.0T 13.0 m 5.9 m
PANDA(*design) 2.0T 2.75m 1.62 m
CLAS12(*design) 5.0T 1.19 m 0.96 m
Conclusion: ~4-5 Tesla fields, with length scale ~ inner diameter scale o.k.
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
16
![Page 17: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/17.jpg)
General Solenoid Field
D B
L
θ0
• BT = B sin θ (from v x B)
• pT = p sin θ
Initial solenoid: B=4T, L=5m, D=2.5m
• θ0 = tan-1(x/L)
• L’ = (L/2)/cosθ, θ<θ0
L’ = (x/2)/sinθ, θ>θ0
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
17
![Page 18: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/18.jpg)
Formulas
..2cos
0136.0
3.0
1
p
plr
T
nL
z
B
4
720
'3.0
p
p
p2
nLB
r
T
• B=central field (T)
• σrφ=position resolution (m)
• L’=length of transverse path through field (m)
• N=number of measurements
• z = charge of particle
• L = total track length through detector (m)
• γ= angle of incidence w.r.t. normal of detector plane
• nr.l. = number of radiation lengths in detector
msc
intr
Assumptions:
• circular detectors around interaction point
• nr.l. = 0.03 (from Hall D CDC)
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
18
![Page 19: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/19.jpg)
dp/p angular dependence
Can improve resolution at forward angles by offsetting IP
p = 50 GeV p = 5 GeV
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
19
![Page 20: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/20.jpg)
Multiple scattering contribution
p = 50 GeV p = 5 GeV
Multiple scattering contribution dominant at small angles (due to BT term in denominator) and small momenta
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
20
![Page 21: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/21.jpg)
“Easier” Solenoid Field – 2T vs. 4T?
• Intrinsic contribution ~ 1/B• Multiple scattering contribution ~ 1/B
p = 50 GeV p = 5 GeV
B=2T
B=4T
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
21
![Page 22: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/22.jpg)
Include dipole field
p = 50 GeV p = 5 GeV
As expected, substantially improves resolutions at small angles
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
22
![Page 23: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/23.jpg)
GEMC (GEant4 MonteCarlo)
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
23
• EIC GEANT MC will be based on GEMC [M. Ungaro]
– Cross section model based on a parameterization of NMC data
• GEMC can retain a very high degree of commonality between its CLAS12 and EIC implementations
– Relies on external field map and geometry services implemented as queries to MySQL databases
– The code could be maintained for both applications.
SVT
CTOF
Beamline
DC
Run 27433
(October 2014)
Tilts, Displacements
RUN
• Geometry server is accessed through a series of PERL scripts– Further information:
https://eic.jlab.org/internal/images/f/f9/Gemc_overview_howto.pptx
![Page 24: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/24.jpg)
EIC GEANT MC
Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
24
• First iteration: understand rate distributions in various parts of the detector– Compare with simple background studies [J. Castilow 09]
Solenoid yoke + Hadronic Calorimeter
Solenoid yoke + Muon Detector
Tracking
5 m
• Implementation will be done in several steps with increasing levels of sophistication
– Cartoon serves as guideline for the implementation
![Page 25: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/25.jpg)
EIC@JLab Simulation and Reconstruction Working Group
• The main goals of the simulation working group is to provide– Event generators for various processes
– Fast Monte Carlo to explore acceptance and resolution requirements
– GEANT4 based Monte Carlo to study detector resolution and acceptance
– Event Reconstruction for GEANT based MC
• GEANT4 MC will use the standard CLAS12 engine, GEMC.– Flexible design uses external, implementation independent field map and
detector geometry servers.
– Support for digitizations, etc provides data that can be used for full event reconstruction.
– Package will be maintained and developed together with CLAS12.
25Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
![Page 26: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/26.jpg)
EIC@JLAB – further info
• EIC@JLAB webpage: http://eic.jlab.org– Overview and general information
• EIC@JLAB WIKI: https://eic.jlab.org/wiki– Ongoing project information
– Working groups
• EIC Collaboration meeting at Catholic University, 29-31 July, DC– Info: http://web.mit.edu/eicc/CUA10/index.html
• Weekly project meetings at JLab– Fridays at 9:30am in ARC724 or F324/25
• Series of Workshops at the INT, Seattle– Info: http://www.int.washington.edu/PROGRAMS/10-3/
26Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010
![Page 27: MEIC Simulation and Reconstruction Group Report Tanja Horn 1 Tanja Horn, CUA Colloquium Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop.](https://reader035.fdocuments.in/reader035/viewer/2022081520/5697bfe21a28abf838cb461a/html5/thumbnails/27.jpg)
Summary
• The EIC@JLab is well suited for taking JLab beyond 12 GeV
– Excellent tool to access nucleon/nuclear structure
• A medium energy collider is particularly appealing for measurements requiring transverse targets and/or good resolution and particle id (e.g., TMDs, GPDs).
– These processes benefit from high luminosity, excellent polarization, and more symmetric collision kinematics.
• Matches energy, luminosity, and detector/IR for deep exclusive and SIDIS processes
• Rapidly Expanding User Community
27Tanja Horn, MEIC Simulation Group Report, EIC Detector Workshop 2010