1. Forward Detectors @ LHC
Present coverage
Possible upgrade projects
Slogan:
Q C D
HERA for LHC
physics and detectors
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen

2. Forward Detectors @ ATLAS (C.Royon,S.White)
relative luminosity
Cerenkov integrating detector (Counter !)
absolute luminosity
Roman Pots with scintillating fibres
later diffraction
Roman Pots with silicon detectors
photoproduction
neutron tagging
Copper / Tungsten scintillating fibres
rapidity gaps
Copper / Liq. Ar
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen

3. Forward Detectors @ CMS/Totem
CMS: HF cal & CASTOR
Totem: T1,T2,
RP1, (RP2), RP3
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen

4. LHC Experiments: pT-h coverage
Diffraction 2006)
CMS fwd calorimetry up to |h|  5 + Castor + ZDC
Exp B
(T)
pT
(GeV)
ALICE
ATLAS
2.0
0.5
CMS
4.0
0.75
LHCb
4Tm
0.1
1000
CMS
ATLAS
100
coverage not complete:
CASTOR
FWDCAL (charged particles) T1 T1
pT (GeV) 10 T2 T2 1 RP
CASTOR
CASTOR RP
0.1
ZDC
FWDCAL
FWDCAL
ZDC
pTmax ~ s exp(-h)
-12
-10 -8 -6 -4 -2 +2 +4 +6 +8
+10
+12 h

5. Possible Upgrades @ CMS/Totem
CASTOR:
contribute to project
use of ZEUS - FPC on one side
FWDCAL:
re-use of H1 SPACAL & ZEUS HES
Preliminary ! Need to negotiate the re-use of components with H1 and ZEUS
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen

6. Physics with CASTOR
Multi-parton interactions & underlying event dynamics: forward energy & particle flow
Low-x dynamics: parton saturation, BFKL / CCFM dynamics reach in x down to x~10-7
Luminosity determination: QED process: pp ppee  calculable to 1%
In general: extend the coverage in η
 enhance hermiticity and improve measurement of missing transverse energy
 beneficial for searches for new physics
Only some examples
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen

7. Contribution to CASTOR Project
CASTOR was initiated in the framework of Heavy Ion LHC, but new collaborators interested in low-x physics joined soon after start .
As HI project  late installation possible  need to speed up the project to be able to measure at low luminosity in the early LHC phase.
Contributions in different areas possible:
construction, DAQ (software), Monte Carlo studies …
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen

8. A possible CASTOR Alternative
ZEUS Forward Plug Calorimeter:
CAL hardware fits in lengths,
radius for beam hole a bit too small  two separate halves,
physics similar as in ZEUS due to equivalent position in η,
radiation hard for the first fb-1
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen

9. FWDCAL for charged particles
Zero Degree 135m detects only neutral particles
 try to add a hadronic calorimeter for charged particles: H1-SPACAL and ZEUS-HES
moderate radiation level
sufficient resolution with shower shape cuts achievable despite 40cm effective beam pipe thickness
V.Andreev HERA-LHC workshop
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen

10. Possible FWDCAL Constructions
Re-arranged H1 SPACAL
(L.Lytkine)
Si pad diodes of Hadron-Electron-Separator of ZEUS
needs to be combined with an appropriate absorber
Active area : 3.32×2.96 cm enough diodes to cover the required space.
Recycle diodes of ZEUS HES
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen

11. Summary
Multiple interactions are crucial for all searches and high pT phenomena.
Need to understand the dynamics of the underlying event, simple tuning the parameters of a Monte Carlo generator might lead to wrong results and includes large systematic uncertainties
 need coverage at large η !
Different possibilities explored by a collaboration of DESY and Russian institutes as a combined effort of experts in forward physics and forward detector components at HERA.
Kerstin Borras (DESY) DESY-LHC Standardmodel Workshop Zeuthen