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Status/results from KLOE/KLOE-2 experiment

Andrzej Kupsc Uppsala University for the KLOE-2 Collaboration

Moscow, August 26th, 2013


Outline KLOE-2 status Most recent results from KLOE: UL: Br(Ks 3 0) PLB723(201 K K (CPT and Lorentz tests) LS


3)54



Prel.


e+e-

IS R

PLB720(2013)336

at 1 GeV () e+e(U boson searches)

JHEP 1301(2013)119

PLB706(2012)251,PLB720(2013)111

e+e- e+e- (TFF) Prel. Prel. Prel.



DANE luminosity upgrade
Frascati -factory
e+e- collider s = M Novel interaction scheme: large angle beam crossing + crabbed waist sextupoles => SuperKEK
PRL104 (2010) 174801

Luminosity vs currents product

KLOE-2 IP collisions: from 2010 Commissioning for KLOE-2 starts Sept2013 Status:L=1.5 x 1032 cm-2s-1 with 1.3 A + 700/800 mA, 7pb-1/day

LNEW=3xL

OLD

KLOE-2: Extension of the KLOE physics program at upgraded DANE


KLOE KLOE-2
EM Calorimeter
E/E=5.7/E % t=57/E 100 ps

Upgrades
Inner Tracker: cyl. GEM

Drift Chamber
pT~0.4% (<45o)

Small angle EMC

2+2 taggers for: e+ee+ee+eX

uly st J y la ead R



* ( ) Hadrons
0-0
11-

0++ 0

KK
BR = 83%

(1020)


a0(980) f0(980)
BR ~ O(10


'

s

BR = 6.210










BR = 15%

BR = 1.3% BR = 1.310

T (1GeV) 80 nb scan MeV pb

KLOE 2001-2005 data


ISR
s
W


s ger Tag

KLOE: Fv(W) in e+e-+-()

sity o min Lu


BR(KS 3 0): UL


KS 3 0 CP violating

not yet observed
-9

SM (ChPT): BR(KS 3 0) = 1.9·10



data 2 ev/bkg New KLOE2013: PLB723(2013) 54 L=1.7 fb-1 indepen improved selection signal eff. (data <2.6·10-8 90%CL

EXP Searches: KL/KS interference: NA48 <7.4·10 Direct: KLOE2005 <1.2·10-7 90%CL L=0.45 fb-1 KS tagged by KL interaction in EMC 3 ev

-7

90%CL

dent data with the same 0 ev/bkg 0 ev)


0, Transition Form Factors (TFF)
Low energy QCD l+l- spectra for HI dark photon (U boson)

LbL for a

* 0 * 0 * e+e- 0

* *



* *

0



* *



First observation

MesonNet(HP3) Workshop on Meson Transition Form Factors May 29-30,2012 KrakСw

P*

*


Radiative widths , , 0 : narrow and short lived => tot=/BR Two kind of measurements Z Primakoff
~2.8%
PrimEx PRL 106,162303(2011)

0

~5%

e+e-



fundamental parameter => should be know precisely (eg mu/md)


meson radiative decay width


L=240 pb
-1

Insensitive to TFF
32.0±1.5 ±0.9 pb

=520±20±13 eV





34.5±2.5 ±1.0 pb


e+e-

31k events

13k events

Form factor/BR:
PRL107 PRL106

U boson limits


9k events

Background radiative Bhabha and 0

efficiency: 15% 2% low high q

Analysis in progress: background subtraction + global efficiency








No kin fit:use DC resolution Not use EMC Energy L = 558 pb-1 205 k events eff=21% S/B=10

Normalization



Consistent with CLEO



Fit data

2

PLB707 (2012) 184

Ndf

83

67

e+e-+

-

=1.31±0.08stat±0.40

sy

±0.02 st

Fv

GeV-2
-2

M=s



WASA

=( 1 . 89 ±0 . 25 ±0 . 59± 0 . 02 ) GeV

[WASA PLB707 (2012) 243]

s [GeV2] KLOE: A+ => b(0)=2.05
+0.22 -0.10

GeV-

2

arXiv:1307.5654


Light quark masses



TH: Bern-Bonn-Lund-Prague CHPT, dispersive

H. Leutwyler, PoS CD09 (2009) 005


a 8 JHEP0805,006 1.090(5)( +9 ) 1 preliminary, 1.104(3)(?) 2013

KLOE2008 analysis (JHEP 0805,006) 0.45 fb-1 1.34·106 events in DP large syst. uncertainty due to Event classification New analysis: 1.7 fb-1 4.48·106 events in DP new analysis scheme improved MC new cross checks
b 0.124(6)(10) 0.144(3)(?)

d 0.057(6)( +7 ) 16 0.073(3)(?)

f 0.140(10)(20) 0.155( 6)(?)

|A(X,Y)|2=N(1+aY+bY2+dX2+fY3+gX2Y)

New analysis PRELIMINARY (no syst. ): f0 confirmed fits with g...


Conclusions
Analysis of high statistics samples produced at KLOE DANE with new IP: commissioning in progress KLOE-2 is starting a data taking campaign ­ KLOE detector + taggers + IT ­ Detector ready to take data Physics program: -peak run O(5 fb-1) Run at 1 GeV O(1 fb-1)? EPJC 68 (2010),619

KLOE-2 + DANE ideal tool for 0, TFF -1
2


KLOE-2 physics programme
physics

Spectroscopy

Existence (and properties) of /f0(600) Study of (S/PS) PS transition form factor Properties of scalar/vector mesons Rare decays physics Te Te Te Te st st st st of of of of CPT (and CPT in KS SM (CKM ChPT (KS QM) in correlated kaon decays semileptonic decays unitarity, lepton universality) decays)

Kaon physics

Dark matter searches Hadronic cross section

Light bosons @ O(1 GeV) em(MZ) and (g-2)