Download - Recent results o f the KLOE-2 Experiment
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Recent results of the KLOE-2 Experiment
Paweł MoskalJagiellonian University, Cracow, Poland
On behalf and for the KLOE and KLOE-2 Collaborations
-Xth Rencontres du Vietnam, Flavour Physics Conference
Quy Nhon, July 27th – August 2nd, 2014
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Indeed recent results of KLOE/KLOE-2:
• A new limit on the CP violating decay KS→3π0
Phys. Lett. B 723 (2013) 54 • Test of CPT and Lorentz symmetry
Phys. Lett. B 730 (2014) 89
• The absolute branching ratio of the K+→ π+π−π+(γ) arXive: 1407.2028
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DAΦNE e+e- collider Frascati (Rome)
• e+e s ~ m = 1019.4 MeV
BR’s for selected decays
15.5%+
34.1%KSKL
49.1%K+K-
e
e+
KLOE Detector
γ
’ γ
1.3 %
0.006%
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KLOE
completed data taking with 2.5 fb-1
~ 8 ∙ 109 ~ 2.5 109 K0K0 entangled pairs~ 3.6 109 K+K- pairs
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KLOE K LOng ExperimentDrift chamberGas: 90% He + 10% C4H10
δpt / pt < 0.4% (θ>45°)σxy ≈ 150 μm ; σz ≈ 2 mm
EM calorimeterlead/scintillating fibers98% solid angle coverageσΕ / E = 5.7% / √(E(GeV))σt = 55 ps / √(E(GeV)) 100 ps⊕PID capabilities Magnetic field 0.52 Tesla
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Ks tagging a unique feature at KLOE
φ: JCP = 1-- KSKL are quantum entanglede+e- φ |KS,p>|KL,-p> -|KS,-p>|KL,p>
KLOE: τS = 89.56 ± 0.03 ± 0.07 ps ( ~0.1%)
e+e- φ KSKL (K+ K-)
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Indeed recent results of KLOE/KLOE-2:
• A new limit on the CP violating decay KS→3π0
Phys. Lett. B 723 (2013) 54 • Test of CPT and Lorentz symmetry
Phys. Lett. B 730 (2014) 89
• The absolute branching ratio of the K+→ π+π−π+(γ) arXive: 1407.2028
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CP allowed: KL→ CP violating: KL → CP allowed: KS → CP violating: KS →000
J. H. Christenson, J. W. Cronin, V. L. Fitch, R. Turlay"Evidence for the 2π Decay of the K0
2 Meson System". Physical Review Letters 13 (1964) 138
CP violating: KS → 000 never observed so far !
50th anniversary of the discovery of CP violation
SM (KS30) = (KL30) |000|2 BR(KS30) ~ 210-9
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KS → 3π0 → 6γ KS → 2π0 + 2 splitted clasters / accidental coincidences DAPHNE
KL → 3π, KS → π+ π- („fake KL crash”)
11
SELECTION OF KS →000 events
SIGNAL BACKGROUND
Splitted clusters
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KL velocity in the φ meson center of mass for events in the six-photon sample.Black points represent data.Lines denote results of background simulations.Green colour indicates events rejected by „track veto”
Final stage of Ks → 3π0 selection KL selection
Black points represents data.Solid red line: background simulationsBlue dashed line: Ks →3π0 simulations
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CP allowed: KL→ CP violating: KL → CP allowed: KS → CP violating: KS →000
J. H. Christenson, J. W. Cronin, V. L. Fitch, R. Turlay"Evidence for the 2π Decay of the K0
2 Meson System". Physical Review Letters 13 (1964) 138
CP violating: KS →000 never observed so far !
50th anniversary of the discovery of CP violation
SM (KS30) = (KL30) |000|2 BR(KS30) ~ 210-9
Factor of five better than previous results
KLOE/KLOE-2: Phys. Lett. B 723 (2013) 54
KLOE-2 has a chance to observe KS - -> 000 decay for the first time in the near future
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Indeed recent results of KLOE/KLOE-2:
• A new limit on the CP violating decay KS→3π0
Phys. Lett. B 723 (2013) 54 • Test of CPT and Lorentz symmetry
Phys. Lett. B 730 (2014) 89
• The absolute branching ratio of the K+→ π+π−π+(γ) arXive: 1407.2028
Upper limit improved by a factor of five
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So now is the time for the observation of CPT violation !!
I thought… the scientific theories were not the digest of observation,but that they were inventions-conjectures boldly put forward for trialto be eliminated if they clashed with observation … David Hume
1964: CP violation discovered KL → J. H. Christenson et al., Phys. Rev. Lett. 13 (1964) 138
2012: T violation confirmed experimentally for the first time BABAR: J. P. Lees et al., Phys. Rev. Lett. 109 (2012) 211801
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LORENTZ SYMMETRY, UNITARITY, LOCALITY C P T
G. Lüders, Ann. Phys. 2 (1957) 1.; Ann. Phys. 281 (2000) 1004 „Proof of the TCP theorem”
Tests of CPT symmetry
Nothing would be more pleasurable than to falsify the theory !! especially such strong as CPT
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φ:JCP = 1-- e+e- φ |KS,p>|KL,-p> -|KS,-p>|KL,p>
no simultaneous decays (t=0) in the samefinal state due to thedestructive quantum interference
t/S
I(t
) (a.
u) mfrom here
cos2;, 2/ tmeeetI ttt LSSL
Kaon interferometry: KSKL
t2 t1
t=t1-t2
Perfect vertex resolution
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|KS(t)> = e-λst|KS>|KL(t)> = e-λLt|KL>|KS> ≈ (1+εs)|K0> + (1-εs)|K0>|KL> ≈ (1+εL)|K0> - (1-εL)|K0> = (εs – εL )/2
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Kaon interferometry and CPT tests
φ
t2 t1
t=t1-t2
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A . A. Michelson, Am. J. Sci. 22 (1881) 120.
Strzelno 1852
10-20 ← PRECYZJA → 0.01
interference fringes
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KLOE-2: Phys. Lett. B 730 (2014) 89
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KLOE-2: Phys. Lett. B 730 (2014) 89
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KLOE-2: Phys. Lett. B 730 (2014) 89
The best sensitivity ever reached in the quark sector
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Indeed recent results of KLOE/KLOE-2:
• A new limit on the CP violating decay KS→3π0
Phys. Lett. B 723 (2013) 54 • Test of CPT and Lorentz symmetry
Phys. Lett. B 730 (2014) 89
• The absolute branching ratio of the K+→ π+π−π+(γ) arXive: 1407.2028
The best sensitivity ever reached in the quark sector
Upper limit improved by a factor of five
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two independent samples of pure kaons
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K+→ π+π−π+(γ)
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Indeed recent results of KLOE/KLOE-2:
• A new limit on the CP violating decay KS→3π0
Phys. Lett. B 723 (2013) 54 • Test of CPT and Lorentz symmetry
Phys. Lett. B 730 (2014) 89
• The absolute branching ratio of the K+→ π+π−π+(γ) arXive: 1407.2028
The best sensitivity ever reached in the quark sector
Upper limit improved by a factor of five
Precision improved by a factor of five
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KLOE-2
Magnetic field 0.52 Tesla
New Interaction Region γγ γγ
C-GEM
QCALT
CCAL
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THANK YOU FOR YOUR ATTENTION
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- interaction:
e+e- → e+e- * * → e+e- + X
LET: E=160-230 MeVLYSO+SiPM sE<10% for E>150 MeV
HET: E > 400 MeV11 m from IP Scintillators + PMTs
sE~2.5 MeV
sT ~ 200 ps
KLOE-2
KLOE-2
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Pairs of quantum entangled neutral mesons
e+e- φ |KS,p>|KL,-p> -|KS,-p>|KL,p> φ: JCP = 1--
KLOE: τS = 89.56 ± 0.03 ± 0.07 ps ( ~0.1%)
e+e- Y(4s) |B0,p>|B0
,-p> - |B0, p>|B0
, -p>
Y(4S): JCP = 1--
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B B0 -- > J/ K+ - -> J/ B + B0 -- > J/ K - -> J/ 000
e+e- Y(4s) |B0,p>|B0
,-p> - |B0, p>|B0
, -p>
J. Barnabeu et al., JHEP08 (2012) 064
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B B0 -- > J/ K+ - -> J/ B + B0 -- > J/ K - -> J/ 000