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Recent results of the KLOE-2 Experiment Paweł Moskal Jagiellonian University, Cracow, Poland On behalf and for the KLOE and KLOE-2 Collaborations - Xth.

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Presentation on theme: "Recent results of the KLOE-2 Experiment Paweł Moskal Jagiellonian University, Cracow, Poland On behalf and for the KLOE and KLOE-2 Collaborations - Xth."— Presentation transcript:

1 Recent results of the KLOE-2 Experiment Paweł Moskal Jagiellonian University, Cracow, Poland On behalf and for the KLOE and KLOE-2 Collaborations - Xth Rencontres du Vietnam, Flavour Physics Conference Quy Nhon, July 27 th – August 2 nd, 2014

2 Production: test of charge symmetry search for the eta-mesic nuclei studies of ABC effect – new resonance? hadronic interactions … Indeed recent results of KLOE/KLOE-2: A new limit on the CP violating decay K S →3π 0 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:

3 DAΦNE e + e - collider Frascati (Rome) ‏ e + e   s ~ m  = MeV BR’s for selected  decays 15.5%  +       34.1% KSKLKSKL 49.1% K+K-K+K- ee e+e+ KLOE Detector  γ γ  ’ γ 1.3 % 0.006% KLOE completed data taking in 2005 with 2.5 fb -1 KLOE completed data taking in 2005 with 2.5 fb -1 corresponding to ~ 8 ∙ 10 9, ~ 10 8 ~ 5 ∙ 10 5 corresponding to ~ 8 ∙ 10 9 , ~ 10 8  and ~ 5 ∙ 10 5  ’

4 KLOE completed data taking with 2.5 fb -1 ~ 8 ∙ 10 9 ~ 8 ∙ 10 9  ~ ~ K 0 K 0 entangled pairs ~ ~ K + K - pairs this presentation is based on ~ 3 · 10 7

5 KLOE K LOng Experiment Drift chamber Gas: 90% He + 10% C 4 H 10 δp t / p t 45°) σ xy ≈ 150 μm ; σ z ≈ 2 mm EM calorimeter lead/scintillating fibers 98% solid angle coverage σΕ / E = 5.7% / √(E(GeV)) σt = 55 ps / √(E(GeV)) ⊕ 100 ps PID capabilities Magnetic field 0.52 Tesla

6 Ks tagging a unique feature at KLOE φ: J CP = 1 -- K S K L are quantum entangled e + e -  φ  |K S, p>|K L, -p> -|K S, -p>|K L, p> KLOE: τ S = ± 0.03 ± 0.07 ps ( ~0.1%) SETP0 KLOE-2 5 fb -1 ( ~0.03 %) e + e -  φ  K S K L ( K + K - )

7 Production: test of charge symmetry search for the eta-mesic nuclei studies of ABC effect – new resonance? hadronic interactions … Indeed recent results of KLOE/KLOE-2: A new limit on the CP violating decay K S →3π 0 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:

8 CP allowed: K L →  CP violating: K L →  CP allowed: K S →  CP violating: K S →  0  0  0 J. H. Christenson, J. W. Cronin, V. L. Fitch, R. Turlay "Evidence for the 2π Decay of the K 0 2 Meson System". Physical Review Letters 13 (1964) 138 CP violating: K S →  0  0  0 never observed so far ! 50th anniversary of the discovery of CP violation SM  (K S  3  0 ) =  (K L  3  0 ) |  000 | 2  BR(K S  3  0 ) ~ 2  10 -9

9 K S → 3π 0 → 6γ K S → 2π splitted clasters / accidental coincidences DAPHNE K L → 3π, K S → π + π - („fake K L crash”)          11 SELECTION OF SELECTION OF K S →  0  0  0 events SIGNAL BACKGROUND SIGNAL BACKGROUND Splitted clusters    

10 K L 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 → 3π 0 selection K L selection Black points represents data. Solid red line: background simulations Blue dashed line: Ks →3π 0 simulations

11 CP allowed: K L →  CP violating: K L →  CP allowed: K S →  CP violating: K S →  0  0  0 J. H. Christenson, J. W. Cronin, V. L. Fitch, R. Turlay "Evidence for the 2π Decay of the K 0 2 Meson System". Physical Review Letters 13 (1964) 138 CP violating: K S →  0  0  0 never observed so far ! 50th anniversary of the discovery of CP violation SM  (K S  3  0 ) =  (K L  3  0 ) |  000 | 2  BR(K S  3  0 ) ~ 2  Factor of five better than previous results KLOE/KLOE-2: Phys. Lett. B 723 (2013) 54 KLOE-2 has a chance to observe K S - ->  0  0  0 decay for the first time in the near future

12 Production: test of charge symmetry search for the eta-mesic nuclei studies of ABC effect – new resonance? hadronic interactions … Indeed recent results of KLOE/KLOE-2: A new limit on the CP violating decay K S →3π 0 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: Upper limit improved by a factor of five

13 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 trial to be eliminated if they clashed with observation … David Hume 1964: CP violation discovered K L →  J. H. Christenson et al., Phys. Rev. Lett. 13 (1964) : T violation confirmed experimentally for the first time BABAR: J. P. Lees et al., Phys. Rev. Lett. 109 (2012) Since nothing is more pleasurable than to falsify the theory !!

14 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

15 φ: J CP = 1 -- e + e -  φ  |K S, p>|K L, -p> -|K S, -p>|K L, p> no simultaneous decays (  t=0) in the same final state due to the destructive quantum interference  t/  S I(  t) (a.u)‏  m  from here Kaon interferometry:   K S K L              t2t2 t1t1  t=t 1 -t 2 Perfect vertex resolution

16 |K S (t)> = e -λ s t |K S > |K L (t)> = e -λ L t |K L > |K S > ≈ (1+ε s )|K 0 > + (1-ε s )|K 0 > |K L > ≈ (1+ε L )|K 0 > - (1-ε L )|K 0 >  = (ε s – ε L )/2 

17 Kaon interferometry and CPT tests φ      t2t2 t1t1  t=t 1 -t 2

18

19 k = 0 dowodzi, że prędkość światła jest niezależna od kierunku V_Ziemi 30 km/s  0.04 prążka dokładność uzyskana wyniosła 0.01 A. A. Michelson, Am. J. Sci. 22 (1881) 120. Strzelno ← PRECYZJA → 0.01 interference fringes

20 KLOE-2: Phys. Lett. B 730 (2014) 89

21

22 The best sensitivity ever reached in the quark sector

23 Production: test of charge symmetry search for the eta-mesic nuclei studies of ABC effect – new resonance? hadronic interactions … Indeed recent results of KLOE/KLOE-2: A new limit on the CP violating decay K S →3π 0 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: The best sensitivity ever reached in the quark sector Upper limit improved by a factor of five

24 two independent samples of pure kaons

25 K + → π + π − π + (γ)

26

27 Production: test of charge symmetry search for the eta-mesic nuclei studies of ABC effect – new resonance? hadronic interactions … Indeed recent results of KLOE/KLOE-2: A new limit on the CP violating decay K S →3π 0 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: The best sensitivity ever reached in the quark sector Upper limit improved by a factor of five Precision improved by a factor of five

28 KLOE-2 Magnetic field 0.52 Tesla New Interaction Region γγ C-GEM QCALT CCAL

29 THANK YOU FOR YOUR ATTENTION

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32  - interaction: e + e - → e + e -  *  * → e + e - + X LET: E= MeV LYSO+SiPM  E 150 MeV HET: E > 400 MeV 11 m from IP Scintillators + PMTs    MeV  T ~ 200 ps KLOE-2

33 Pairs of quantum entangled neutral mesons e + e -  φ  |K S, p>|K L, -p> -|K S, -p>|K L, p> φ: J CP = 1 -- KLOE: τ S = ± 0.03 ± 0.07 ps ( ~0.1%) SETP0 KLOE-2 5 fb -1 ( ~0.03 %) e + e -  Y(4s)  |B 0, p>|B 0, -p> - |B 0, p>|B 0, -p> Y(4S) : J CP = 1 --

34 B   B 0 -- > J/  K + - -> J/   B +  B 0 -- > J/  K  - -> J/   0  0  0 e + e -  Y(4s)  |B 0, p>|B 0, -p> - |B 0, p>|B 0, -p> J. Barnabeu et al., JHEP08 (2012) 064

35 B   B 0 -- > J/  K + - -> J/   B +  B 0 -- > J/  K  - -> J/   0  0  0


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