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Recent results o f the KLOE-2 Experiment

Recent results o f the KLOE-2 Experiment. Pawe ł 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.

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Recent results o f the KLOE-2 Experiment

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  1. Recentresults of the KLOE-2 Experiment PawełMoskal JagiellonianUniversity, Cracow, Poland On behalf and for the KLOE and KLOE-2 Collaborations -XthRencontresduVietnam, FlavourPhysics Conference QuyNhon, July 27th– August 2nd, 2014

  2. Indeedrecentresults 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 symmetryPhys. Lett. B 730 (2014) 89 • The absolute branching ratio of the K+→ π+π−π+(γ) • arXive: 1407.2028 • Production: • test of chargesymmetry • search for the eta-mesicnuclei • studies of ABC effect – newresonance? • hadronicinteractions …

  3. KLOEDetector BR’s for selected  decays 49.1% K+K- KSKL 34.1% + 15.5% DAΦNE e+e- colliderFrascati(Rome)‏ e+ e γ 1.3 % ’ γ 0.006% • e+es ~ m = 1019.4 MeV KLOEcompleted data takingin 2005 with 2.5 fb-1 corresponding to ~ 8 ∙ 109 , ~ 108 and ~ 5 ∙ 105’

  4. KLOE completed data taking with 2.5 fb-1 ~ 8 ∙ 109 ~ 2.5 109K0K0entangledpairs ~ 3.6 109K+K- pairs thispresentationisbased on ~ 3 · 107

  5. KLOE K LOngExperiment Driftchamber Gas: 90% He + 10% C4H10 δpt / pt< 0.4% (θ>45°) σxy ≈ 150 μm ; σz ≈ 2 mm EM calorimeter lead/scintillatingfibers 98% solid anglecoverage σΕ / E = 5.7% / √(E(GeV)) σt = 55 ps / √(E(GeV))⊕100 ps PID capabilities Magnetic field 0.52 Tesla

  6. Kstagging a uniquefeatureat KLOE e+e-φ KSKL (K+K-) φ: JCP = 1--KSKL are quantum entangled e+e-φ|KS,p>|KL,-p>-|KS,-p>|KL,p> KLOE: τS = 89.56 ± 0.03 ± 0.07 ps ( ~0.1%) SETP0 KLOE-2 5 fb-1 ( ~0.03 %)

  7. Indeedrecentresults 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 symmetryPhys. Lett. B 730 (2014) 89 • The absolute branching ratio of the K+→ π+π−π+(γ) • arXive: 1407.2028 • Production: • test of chargesymmetry • search for the eta-mesicnuclei • studies of ABC effect – newresonance? • hadronicinteractions …

  8. 50th anniversary of the discovery of CP violation J. H. Christenson, J. W. Cronin, V. L. Fitch, R. Turlay "Evidence for the 2π Decay of the K02Meson System". Physical Review Letters 13(1964) 138 CP allowed: KL→ CP violating: KL→ CP allowed: KS→ CP violating: KS→000 CP violating: KS→000 neverobservedso far ! SM (KS30) = (KL30) |000|2  BR(KS30) ~ 210-9

  9. SELECTION OF KS→000 events SIGNAL BACKGROUND              Splittedclusters KS → 3π0 → 6γ KS→ 2π0 + 2 splittedclasters / accidentalcoincidences DAPHNE KL→ 3π, KS →π+ π- („fake KLcrash”)

  10. KLselection Finalstage of Ks → 3π0selection Black pointsrepresents data. Solid red line: backgroundsimulations Blue dashedline: Ks→3π0simulations KLvelocity in the φmesoncenter of mass for events in the six-photonsample. Black pointsrepresent data. Lines denoteresults of backgroundsimulations. Green colourindicateseventsrejected by „track veto”

  11. 50th anniversary of the discovery of CP violation J. H. Christenson, J. W. Cronin, V. L. Fitch, R. Turlay "Evidence for the 2π Decay of the K02Meson System". Physical Review Letters 13(1964) 138 CP allowed: KL→ CP violating: KL→ CP allowed: KS→ CP violating: KS→000 CP violating: KS→000 neverobservedso far ! SM (KS30) = (KL30) |000|2  BR(KS30) ~ 210-9 KLOE/KLOE-2: Phys. Lett. B 723 (2013) 54 Factor of five betterthanpreviousresults KLOE-2 has a chance to observeKS - -> 000 decay for the firsttime in the nearfuture

  12. Indeedrecentresults 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 symmetryPhys. Lett. B 730 (2014) 89 • The absolute branching ratio of the K+→ π+π−π+(γ) • arXive: 1407.2028 Upper limit improved by a factorof five • Production: • test of chargesymmetry • search for the eta-mesicnuclei • studies of ABC effect – newresonance? • hadronicinteractions …

  13. 1964: CP violationdiscoveredKL→ J. H. Christensonet al., Phys. Rev.Lett.13 (1964) 138 2012: T violationconfirmedexperimentally for the firsttime BABAR: J. P. Lees et al., Phys. Rev. Lett. 109 (2012) 211801 Sonowis the time for the observation of CPT violation !! I thought… the scientifictheorieswere not the digest of observation, but thattheywereinventions-conjecturesboldlyputforward for trial to be eliminatediftheyclashed with observation … David Hume Sincenothingismorepleasurablethan to falsify the theory !!

  14. Tests of CPT symmetry LORENTZ SYMMETRY, UNITARITY, LOCALITY  C P T G. Lüders, Ann. Phys. 2 (1957) 1.; Ann. Phys. 281 (2000) 1004 „Proof of the TCP theorem” Nothingwould be morepleasurable thanto falsifythe theory !! especiallysuchstrong as CPT

  15. Kaoninterferometry:KSKL t=t1-t2     t1 t2  φ:JCP = 1-- e+e-φ|KS,p>|KL,-p>-|KS,-p>|KL,p> mfrom here I(t) (a.u)‏ Perfect vertex resolution no simultaneous decays (t=0) in the same final state due to the destructive quantum interference t/S

  16. |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 

  17. Kaon interferometry and CPT tests t=t1-t2     t1 t2  φ

  18. A . A. Michelson, Am. J. Sci. 22 (1881) 120. interferencefringes Strzelno 1852 10-20 ← PRECYZJA → 0.01 V_Ziemi 30 km/s  0.04 prążka dokładność uzyskana wyniosła 0.01 k = 0dowodzi, że prędkość światła jest niezależna od kierunku

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

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

  21. KLOE-2: Phys. Lett. B 730 (2014) 89 The best sensitivity ever reached in the quark sector

  22. Indeedrecentresults 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 symmetryPhys. Lett. B 730 (2014) 89 • The absolute branching ratio of the K+→ π+π−π+(γ) • arXive: 1407.2028 Upper limit improved by a factorof five The best sensitivity ever reached in the quark sector • Production: • test of chargesymmetry • search for the eta-mesicnuclei • studies of ABC effect – newresonance? • hadronicinteractions …

  23. two independent samples of purekaons

  24. K+→ π+π−π+(γ)

  25. Indeedrecentresults 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 symmetryPhys. Lett. B 730 (2014) 89 • The absolute branching ratio of the K+→ π+π−π+(γ) • arXive: 1407.2028 Upper limit improved by a factorof five The best sensitivity ever reached in the quark sector Precision improved by a factorof five • Production: • test of chargesymmetry • search for the eta-mesicnuclei • studies of ABC effect – newresonance? • hadronicinteractions …

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

  27. THANK YOU FOR YOUR ATTENTION

  28.  - interaction: e+e- → e+e- * *→ e+e- +X KLOE-2 LET: E=160-230 MeV LYSO+SiPMsE<10% for E>150 MeV KLOE-2 HET: E > 400 MeV 11 m from IP Scintillators + PMTs sE~ 2.5MeV sT~ 200 ps

  29. Pairs of quantum entangledneutralmesons e+e-φ|KS,p>|KL,-p>-|KS,-p>|KL,p> φ: JCP = 1-- e+e-Y(4s)|B0,p>|B0,-p>- |B0, p>|B0, -p> Y(4S):JCP = 1-- KLOE: τS = 89.56 ± 0.03 ± 0.07 ps ( ~0.1%) SETP0 KLOE-2 5 fb-1 ( ~0.03 %)

  30. e+e-Y(4s)|B0,p>|B0,-p>- |B0, p>|B0, -p> B  B0 -- > J/ K+ - -> J/  B+  B0 -- > J/ K - -> J/ 000 J. Barnabeu et al., JHEP08 (2012) 064

  31. B  B0 -- > J/ K+ - -> J/  B+  B0 -- > J/ K - -> J/ 000

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