R Tschirhart USJapan 30th Anniversary Symposium Kona Hawaii October 20 th 2010 K aons at the TeV atron The KTeV experiment was primarily a comprehensive study of neutral kaon ID: 718039
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Slide1
US-Japan and the KTeV Research Program at Fermilab
R. Tschirhart
US-Japan 30th Anniversary Symposium
Kona, Hawaii
October 20
th
2010Slide2
Kaons at the
TeV
atron
The KTeV experiment was primarily a comprehensive study of neutral kaon decays, data collected 1996-2000. The research program yielded 32 PhD theses and 50 physics publications, most notably the establishment of matter/antimatter asymmetry in particle decay amplitudes.This rich research program was largely driven by intense beams of in-flight neutral kaon decays reconstructed with a high-speed , high-resolution spectrometer.
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide3
Context and Prejudice: Flavor Physics in the early 1990’s
Neutrino mixing out of reach??
What
is CP violation? Why is it so small? A new super-weak force??The top quark is elusive…..very high mass; does it even exist?If the top quark exists and is heavy…new high mass particles can compete in virtual loops in flavor changing neutral currents. But…B meson’s are reconstructed only by the handful.K mesons can be produced in large numbers, but how can we possibly measure the rare KLgp0p
0 neutral mode decay with sufficient precision to search for direct matter anti-matter asymmetries?? US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide4
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - Fermilab
Fast forward…
Highlights of
KTeV Science… Re(e’/e) = (1.66 ± 0.26)×10-3*
KL
g
p
0
ee
, p
0mm
G(K0→p+p-) - G(K0→p+p-) G(K0→p+p-) + G(K0→p+p-)
= (5.04 ± 0.22) ×10-6 **
Matter/Antimatter asymmetry in a decay amplitude established,
Superweak
model excluded.
Large
component of this asymmetry might arise from New Physics.
KTeV
limited these rates to x8 and x25 the Standard model rates (10-11 level) for the ee and mm modes….fertile hunting ground for new physics models.
* PDG, **J Imazoto
Insert piee/pimumu plot hereSlide5
Serendipity: Resolution of the Vud
/
V
us/Vub non-Unitarity tension by precision measurement of KLgpen decays. US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - Fermilab
Enrico
Lunghi
, LME-2010, Fermilab
2010: KTeV,BNL-865,NA48,KLOE
New Physics models squeezed out beyond the 5
TeV
scale
2004: |Vud|2+|Vus|2+|Vub|2 < 1 ??Slide6
…Our competitors and colleagues…
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide7
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - Fermilab
Emergence of the “Flavor Problem”
Why don’t we see the
Terascale Physics we expect affecting the flavor physics we study today??
4Slide8
KTeV was the culimanation of the high-energy in-flight program at Fermilab
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - Fermilab
University of Chicago GroupSlide9
Enabling Collaboration!
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - Fermilab
1996
KTeV Collaboration meeting at the University of Arizona.75 collaborators, 32 PhD students, 50 science publications. Slide10
US-Japan Contributions to KTeV
:
Unprecedented
photon calorimetry and Trigger & DAQBeam view of K0
gp0p0
in
CsI
calorimeter
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide11
KTeV Pure CsI Calorimeter
3100
crystals, 1.9mx1.9m
27 X0 deep (50cm)90% of light has 20-nsec componentOsaka group and US-J developed “collar” veto systems that cleanly defined acceptance. US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide12
Calorimeter Readout
5-6 Stage low-gain (x3000) PMTs
critical to
preserve large dynamic range. Developed by Osaka, Fermilab, and UCLA (Arisaka-san) working closely with Hamamatsu. PMTs funded by US-Japan. QIE: 16-bit range-compressed charge integrating pipelined readout (9-bit resolution) operating at 53 MHz local to PMT base, developed by FNAL. US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide13
Delivered EM-calorimetry performance b
etter
than 1% resolution over full physics energy range:
Best in the field US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide14
KTeV CsI Crystals and PMTs continuing great science in the
JPARC E14 K
L
gp0nn adventureUS-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - Fermilab
JPARC PAC tour of E14 calorimeter
E14 Calorimeter assembly
KTeV
Calorimeter assemblySlide15
US-Japan largely funded the visionary DAQ that was first in the field to
filter out most
events based on
full reconstructionUS-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - Fermilab
Great science needs great throughput!
Visionary effort led by Yamanaka-san and
Nakaya
-sanSlide16
The US-
Japan@KTeV
Legacy
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabEstablished decay-amplitude matter-antimatter asymmetries together with our CERN colleagues.Probed many, many rare-decays that have cranked up the tension on the “flavor problem”. Substantially advanced the state of the art in precision
calorimetry and data acquisition in High Energy Physics. Developed next generation leaders in flavor physics and elsewhere.
Ichiro Suzuki, Seattle Mariners:
(
鈴木 一朗
)
Best player in the league-
Achieved through systematic high quality team-work and leadership on the fieldSlide17
Spares
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide18
Osaka Unviersity PhDs
“Study of the Decay K
L
->pi+-e-+nu e+e- to Probe the Semileptonic K-pi Structure” by Katsushige Kotera, Osaka University, September, 2006."CP Asymmetry in the Decay KL-> pi+pi-e+e
-" by Katsumi Senyo, Osaka University, December, 1999.
"Search for the Decay K
L
->pi
0
mu
+ mu-" by Masayoshi Sadamoto, Osaka University, February 1999."Search for the Decay K
L->pi0 nu nu-bar" by Kazunori Hanagaki, Osaka University, August 1998. US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide19
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - FermilabSlide20
US-Japan 30th Anniversary Symposium October 20th 2010 R. Tschirhart - Fermilab