S. Bianchin PANIC 2011 (July 24 th – 29 th 2011) Sébastien Bianchin TRIUMF / University of British Columbia on behalf of the TREK-E06 Collaboration PANIC 2011 (July 24 th – 29 th , 2001) Massachusetts Institute of Technology, MA, USA Thursday, July 28 th 2011 Search for Non-Standard Model Physics Using the Transverse Muon Polarization in Stopped K + Decay The E06 TREK Experiment 1
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S. Bianchin PANIC 2011 (July 24th – 29th 2011)
Sébastien Bianchin TRIUMF / University of British Columbia
on behalf of the TREK-E06 Collaboration
PANIC 2011 (July 24th – 29th, 2001)
Massachusetts Institute of Technology, MA, USA
Thursday, July 28th 2011
Search for Non-Standard Model Physics
Using the Transverse Muon Polarization
in Stopped K+ Decay
The E06 TREK Experiment
1
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
TREK = Time Reversal Experiment with Kaons
Outline
TREK Program
Search for Time Reversal Symmetry Violation
Test of Lepton Universality
Search for Heavy Neutrinos
Hadron Facility at J-PARC
TREK Apparatus – R&D
Status & Schedule
Lower intensity
The TREK Program at J-PARC
2
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
Stopped K+ Experiments @ K1.1BR
3
P36 (LFU)
“Measurement of RK = (K+ →e+) / (K+ →m)
and search for heavy sterile neutrinos”
Stage-1 (PAC11-Jan’11); 30 kW (~2013) (S. Shimizu, Parallel 5C – Meson Decays, July 28th @ 4pm)
E06 (TREK)
“Measurement of T-violating transverse muon
polarization (PT) in K+→0mdecay”
Stage-1, 270 kW (~2014)
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
Stopped K+ Experiments @ K1.1BR
3
E06 (TREK)
“Measurement of T-violating transverse muon
polarization (PT) in K+→0mdecay”
Stage-1, 270 kW (~2014)
P36 (LFU)
“Measurement of RK = (K+ →e+) / (K+ →m)
and search for heavy sterile neutrinos”
Stage-1 (PAC11-Jan’11); 30 kW (~2013) (S. Shimizu, Parallel 5C – Meson Decays, July 28th @ 4pm)
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
K+→mdecay
PT is T-odd, and spurious effects from final state interaction are small: PT (FSI) < 10-5 Non-zero PT is a signature of T violation
Standard Model (SM) contribution to PT : PT (SM) < 10-7 -
PT in the range 10-3 – 10-5 is a sensitive probe of CP violation beyond the SM.
There are theoretical models of new physics which allow a sizable PT value without conflicting with other experimental constraints.
The TREK experiment aims for a sensitivity of 10-4
Transverse m+ Polarization in the Km3
Decay
4
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
PTstat ~ 0.05 PT
stat (E246) ~ 10-4 : 1.4 x 107 sec runtime
1) Precise calibration of misalignments 2) Correction of systematic effects 3) Precise fwd-bwd cancellation
1) Beam intensity x 30 2) Detector acceptance x 10 3) Larger analyzing power
Double ratio experiment AT = (Afwd - Abwd ) / 2 Ncw - Nccw Afwd(bwd) = Ncw + Nccw PT = AT / {<cosT>}
: analyzing power <cosT> : attenuation factor Im = PT / KF : physics parameter
KF : kinematic factor
M.Abe et al., Phys. Rev. D 73, 072005 (2006)
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bwd - fwd -
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
Planar GEMs (C1)
between CsI and C2
Cylindrical GEM (C0)
as replacement for old C1
70 µm holes
140 µm spacing
GEM technology --
In collaboration with
Jefferson Lab,
Hampton U. and MIT
TREK/E06 Tracking Upgrade
12
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
300 mm
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0 m
m
16
0 m
m
• Vertex tracking near target, < 0.1 mm • Very high rate capability > 1 kHz/mm2
• Radiation-hardness >> 107 particles/mm2
The C0 Cylindrical GEM for TREK
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S. Bianchin PANIC 2011 (July 24th – 29th 2011)
• Improve the timing characteristics of
CsI(Tl) by replacing PIN diode with APD
• Pulse shaping and pile-up analysis
One-module energy One-module timing
too slow new requirement
• Both 1 and 9 module tests have been performed using an e+ beam at Tohoku Univ. to check the energy resolution and high-rate performance of APD readout
R&D(1) – APD Readout for CsI(Tl)
14
C1 GEM
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
Full angular acceptance for positrons – 10x higher than in E-246
Determination of decay vertex – background-free measurement
Measurement of e+ angle and approx. energy – higher analyzing power
Improved field alignment – suppressed systematic error
Full-size prototype tested at TRIUMF in Nov. 2009
μ+
e+
Top View
μ+
R&D(2) – Active Muon Polarimeter
15
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
R&D(3) – Active Scintillating Fiber Target
16
Light Guide: Kuraray Y11 WLS Fibre (1400 mm)
Readout: SiPMT (Hamamatsu MMPC)
1x1 mm2 / 400 px
Gain 7.5x105
3x3 mm2
356 fibres
S. Bianchin PANIC 2011 (July 24th – 29th 2011)
Target:
Finer segmentation of TGT scintillating fibres Readout: MPPC (SiPMT) Hamamatsu
Particle ID:
Aerogel Cherenkov surrounding target, TOF
Charged particle tracking: Add new element C1 between CsI(Tl) and C2