Status of the KLOE-2
experiment
A. Di Cicco
On behalf of the KLOE-2 Collaboration
International Conference on Dark Matter, Hadron Physics and Fusion Physics
Messina, September 24-26, 2014
Outline
Commissioning of both DAΦNE and KLOE
KLOE-2 physics program.
DAΦNE Φ-factory at LNF.
KLOE apparatus and its upgrade.
Sub-detectors present status.
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From KLOE to KLOE-2: physics
KLOE acquired 2.5 fb-1 @ √s = MΦ + 250 pb-1 off-peak [Riv. Nuovo Cimento Vol.31, N.10 (2008)]
Recent papers:
✓ Search for light vector boson production in
e+e-→U𝛾, U→μ+μ- events
[PLB 736 (2014) 459]
✓ Measurements of the absolute BR for K+→π+π-π+(𝛾)
(accepted by PLB, [arXiv:1407.2028] )
✓ BR and TFF for φ→ηe+e- with η→π0π0π0
(submitted to PLB, [arXiv:1409.4582] )
✓ CPT and Lorentz invariance
[PLB 730 (2014) 89]
A. Di Cicco, Roma Tre University & INFN, DHF14
3
From KLOE to KLOE-2: physics
KLOE acquired 2.5 fb-1 @ √s = MΦ + 250 pb-1 off-peak [Riv. Nuovo Cimento Vol.31, N.10 (2008)]
Recent papers:
Ongoing analyses
✓ Search for light vector boson production in
✓ BR and TFF for φ→π0e+e✓ Search for light vector boson production in
e+e-→U𝛾, U→μ+μ- events
[PLB 736 (2014) 459]
✓ Measurements of the absolute BR for K+→π+π-π+(𝛾)
(accepted by PLB, [arXiv:1407.2028] )
✓ BR and TFF for φ→ηe+e- with η→π0π0π0
(submitted to PLB, [arXiv:1409.4582] )
✓ CPT and Lorentz invariance
[PLB 730 (2014) 89]
A. Di Cicco, Roma Tre University & INFN, DHF14
4
e+e-→U𝛾, U→e+e- events
✓ Measurement of charged kaon mass
✓ QM tests in φ→KSKL→π+π-π+π✓ Measurements of T violation in
φ→KSKL→3π0 πlν
✓ CPT tests in KS→ πlν
From KLOE to KLOE-2: physics
KLOE acquired 2.5 fb-1 @ √s = MΦ + 250 pb-1 off-peak [Riv. Nuovo Cimento Vol.31, N.10 (2008)]
Recent papers:
Ongoing analyses
✓ Search for light vector boson production in
✓ BR and TFF for φ→π0e+e✓ Search for light vector boson production in
e+e-→U𝛾, U→μ+μ- events
[PLB 736 (2014) 459]
✓ Measurements of the absolute BR for K+→π+π-π+(𝛾)
(accepted by PLB, [arXiv:1407.2028] )
✓ BR and TFF for φ→ηe+e- with η→π0π0π0
(submitted to PLB, [arXiv:1409.4582] )
✓ CPT and Lorentz invariance
[PLB 730 (2014) 89]
e+e-→U𝛾, U→e+e- events
✓ Measurement of charged kaon mass
✓ QM tests in φ→KSKL→π+π-π+π✓ Measurements of T violation in
φ→KSKL→3π0 πlν
✓ CPT tests in KS→ πlν
The KLOE-2 project aims at improving the successful and fruitful results achieved by the
KLOE Collaboration and extending its physics program.
see [EPJ C 68 (2010) 619]
• 𝛾𝛾-physics
• search for particles from hidden sectors that might explain dark matter
• neutral kaon interferometry, CPT and QM tests
• kaon physics, KS rare decays, CKM, LFV
• light hadrons physics
• hadron cross-section at low energy
A. Di Cicco, Roma Tre University & INFN, DHF14
5
KLOE-2 at DAΦNE Φ-factory
Frascati Φ-factory DAΦNE: e+e- collider @ √s ≈ 1.02 GeV = MΦ
Best performance in 2005:
• Lpeak = 1.4 x 1032 cm-2s-1, L∫day = 8.5 pb-1/day
Best performance 2014: Ongoing Commissioning
to reduce background
Luminosity (x1030 cm-2s-1)
Currents (mA)
Best Luminosity run
• Lpeak = 1.7x1032 cm-2s-1
• L∫h = 430 nb-1/h
• ~ 600 kHz background
Goal
Background (kHz)
‣∫L = 1 fb-1 by June 2015
‣low background
(< 400kHz)
A. Di Cicco, Roma Tre University & INFN, DHF14
6
KLOE-2 at DAΦNE Φ-factory
• 4 m diameter, 3.3 m length
• 90% helium + 10% isobutane
• 12582/52140 sense/tot wires
• all-stereo geometry
Φ → KSKL, K+K-
• Lead/Scintillating Fibers
• 98% solid angle coverage
• 88 modules (barrel + end-caps)
• 4880 PMTs (two-side readout)
Drift Chamber
7m
Electromagnetic Calorimeter
6m
• σrφ = 150 μm, σz = 2 mm
• σV = 3 mm
• σpT/pT = 0.4%
A. Di Cicco, Roma Tre University & INFN, DHF14
B = 0.52 T
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• σE/E = 5.7%/√E(GeV)
• σt = 54 ps/√E(GeV)
⊕ 140 ps (calib)
KLOE-2 detector upgrades
LET & HET
[NIMA 617 (2010),81 & 266]
• LYSO + SiPMs & Scint + PMTs
• e+e--taggers for 𝛾𝛾-physics
CCALT
[Nucl. Phys. B 197 (2009),215]
• LYSO+APDs
• increase acceptance for 𝛾’s
form IP (20º to 11º)
INNER TRACKER
[NIMA 628 (2011),194]
• 4 layers of cylindrical triple-GEM
• better vertex reconstruction near IP
• larger acceptance for low-pT tracks
QCALT
[NIMA617(2010),105]
• W + scint. tiles + WLS&SiPMs
• quadrupoles coverage for
KL decays
A. Di Cicco, Roma Tre University & INFN, DHF14
8
Low Energy Tagger
• Momentum measurements to study
e+e-→ e+e- 𝛾*𝛾* → e+e-X
HET
HET
x (cm)
y
• tag e+e- at 1 m from IP
having 160 < E < 230 MeV
• σE < 10% for E > 150 MeV, σt ~ 1 ns
• LET re-installed in June 2013
• New FEE boards & ADCs in preparation
to improve resolution and rate capability
• Calibration ongoing using MIPs
Horizontal Plane (y = 0)
Calibration with MIPs:
≥ 1 LET crystals fired
z
+ 2 EMC clusters
z (cm)
A. Di Cicco, Roma Tre University & INFN, DHF14
9
High Energy Tagger
• Momentum measurements to study
e+e-→ e+e- 𝛾*𝛾* → e+e-X
HET
• tag e+e- at 11 m from IP having E > 400 MeV
• energy range depends on the final position
HET
of the detector along the BP
• Detector box with FEE close to the detector
for low-noise operational conditions
• σt = 200 ps, σE = 2.5 MeV
• HET almost ready to take data: further calibration e- beam in DAFNE:
clearly distinguished circulating bunches
A. Di Cicco, Roma Tre University & INFN, DHF14
10
Crystal CALorimeter with Time
• Very close to the IP
• σE ~ 5% at E = 500 MeV
1 CCALT crystal on electron beam at BTF (LNF)
100 MeV e-’s
IT
σt ~ 49 ps
CCALT
QCALT
CCALT
• σt ~ 120 ps at E = 500 MeV
• An idea is to use CCALT
as a luminometer for DAFNE
IT
A. Di Cicco, Roma Tre University & INFN, DHF14
11
Quadrupole CALorimeter with Tiles
LET housing
IT
• Installed on the DAΦNE quadrupoles
• σz ~ 2 cm for E > 150 MeV, σt ~ 1 ns
• New multi-engine cooling system to reduce FEE
temperature has been installed
• All 12 modules ON: equalized gain/channels
QCALT
1 module occupancy plots
All channels on with
equalized response
Cooling
A. Di Cicco, Roma Tre University & INFN, DHF14
12
Inner Tracker
• First time an experiment exploits a cylindrical GEM tracker
• No mechanical supports in the active area
• New single-mask technique GEM foils
• Installed at Rmin = 13 cm from the IP
• 70 cm active length
• XV strips/pads novel readout
(kapton/copper multilayer circuits)
• σx ≈ 200 μm & σy ≈ 350 μm measured on a XV planar GEM
• Alignment & Calibration in progress
• Efficiency evaluation procedure ongoing
• Operational parameters tuning
XV readout
A. Di Cicco, Roma Tre University & INFN, DHF14
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Conclusions
๏ DAΦNE Commissioning is ongoing
• cryogenics maintenance before restarting
• further background reduction needed to operate full detector
๏ KLOE-2 Commissioning is ongoing
• DC & EMC calibrated and ready for data taking
• HET & LET calibrated and ready for data taking
• Sub-detectors undergoing commissioning
Thank you
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SPARES
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