# Presentation: 535510

## M. Moulson
INFN/KLOE-Frascati
Workshop on Future Kaon Experiments at the AGS
Brookhaven, 13 May 2004

**INFN/KLOE-Frascati**
**Workshop on Future Kaon Experiments at the AGS**
**Brookhaven, 13 May 2004**

**Kaon physics with KLOE**

## DANE: the Frascati factory

**2002:**
**280 pb********1**

**2001: **
**170 pb********1**

**2000: **
**20 pb********1**

- Days of running

- Integrated luminosity (pb1)

- 2002 best Lpeak		**7.8****	****× ****10****31**** cm********2 ****s********1**
- 2002 avg L				**~4****	****× ****10****31**** cm********2 ****s********1**
- Machine upgrades for 2004:
**L****avg****  ****> 10****32**** ****cm********2 ****s********1****	********	****2 fb********1****/yr**

**KLOE 2001-2002**
**1.4 ****× ****10****9**** ********decays**

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Kaon physics at DANE

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Physics vs. luminosity: perspectives

| 0.5 fb1
5×108 KSKL | KLOE
today | Limit on BR(KS  30) at 107 level
KS  e charge asymmetry (AS) to 102
Vus from K3 decays at few × 103 level |
| --- | --- | --- |
| 2 fb1
2×109 KSKL | KLOE 
’04-’05 | Limit on KS  30 at 108 level
AS to 4 × 103
First studies of KSKL system with interference |
| 40 fb1
4×1010 KSKL | Original KLOE program | Re / at 104 level
Im / at 103 level from KSKL interference |
| 200 fb1
2×1011 KSKL | DANE2 | High-precision studies of KSKL system via interference measurements
Competitive measurement of Re  from AS
BR(KS  30) and BR(KS  0) to 20% |
| K, KL0, and KL0 probably not within reach |  |  |

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## The KLOE experiment

**Be beam pipe** (0.5 mm thick)
**Instrumented permanent magnet**
**quadrupoles** (32 PMT’s)
**Drift chamber** (4 m   3.3 m)
- 90% He + 10% IsoB, CF frame
- 12582 stereo sense wires
**Electromagnetic calorimeter**
- Lead/scintillating fibers
- 4880 PMT’s
**Superconducting coil** (5 m bore)
*B* = 0.52 T  (  *B dl*  = 2 T·m)

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## KLOE detector specifications

*******E*****/*****E*** 	**5.7% /*********E*****(GeV)**
*******t***** ****	****54 ps /*********E*****(GeV) ******** 50 ps**
- 	(relative time between clusters)
*******L*****(********)****	****~2 cm** ( from *K**L*  )

*******p*****/*****p*** 		**0.4 % **(tracks with  > 45°)
******x****hit****	****	****150 ********m (*****xy*****), 2 mm (*****z*****)**
******x****vertex****  ~1 mm**

***Calorimeter***

***Drift chamber***

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Tagged KL and KS “beams”

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## KS  000 – tests of CP and CPT

- If *CPT* conserved:	*S* = *L* |000|2	**BR(*****K******S***** ******** 3********0****) ~ 2 ****× ****10********9**
- Best results:	BR < 1.4 × 105 	90% CL	SND ’99
- 	BR < 1.4 × 106 	90% CL 	NA48 ’03 preliminary
**Uncertainty on *****K******S***** ******** 3********0**** amplitude currently limits precision on Im ******
- From unitarity:
- Best results:	Im  = (2.4  5.0) × 105	CPLEAR ’99
- 	Im  = (1.2  3.0) × 105	NA48 ’03 preliminary
**A limit on BR(*****K******S***** ******** 3********0****) at 10********7**** level would limit:**

*K**S * 000 *– tests of CP and CPT*

- *S,L* =   

*Compare:*
*m**K*/*m*Planck = 4 × 1020

******Im ******** <  ~ 2 ****× ****10********5**

**<  ~ 8 ****× ****10********19**

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Search for KS  000

_**Preselection:**_
*K**S* tagged by *K**L* crash
- 6 photon clusters, no tracks from IP
- Kinematic fit to refine cluster parameters

_**Rejection of background:**_** **
***K******S***** ******** ********0********0**** + 2********split/accidental clusters**
- Define signal box in 23 vs. 22 plane:
**************	** 	3 cluster pairs with best 0 mass estimates
************pair 4 clusters using 0 masses, *E*(*K**S*), **p**(*K**S*), angle between 0’s
- Final cut on residual *K**S* energy: *E*(*K**S*)  *E*

******2****2******

******2****3******

- MC 3 (BR 105)
- MC 2

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Search for KS  000

*Search for K**S * 000

- Signal box optimized using dedicated MC subsample
- 3 = 	22.6%
- 	(events with *K**L* crash)
***N*****bkg****(MC) = 3.2 ******** 1.4 ******** 0.5**
- Use *N*bkg(expected) = 1.7 (1)
***N*****obs**** = 4**
**KLOE preliminary**
**450 pb********1**** ’01+’02 data**
**BR(*****K******S***** ******** ********0********0********0****)  **
****** ****2.3 ****× ****10********7****  90% CL**

******2****2******

******2****3******

- Data
- MC 2

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## A word on KS  

- PDG Avg.** ****	****3.2************1.2********×********10********7******[E621 ’96, CPLEAR ’97**]**
- Phenomenology & PT	**2.4 ******** 0.7****	****×**** 10********7**
-  = *A*[*K**S * ()*CP*]/*A*[*K**L * ]  ~ 000
*CP*– component extracted by integration over Dalitz plot, traditionally in interference measurements
- Feasibility studies indicate  ~ 5% at KLOE (0.017 evts/pb1)

*A word on K**S * 

| 450 pb1
(~8 evts) | First direct measurement 
Competitive with existing measurements |
| --- | --- |
| 2 fb1
(~33 evts) | Measurement of BR(KS  ) to < 20%
Comparison for PT calculations of I = 3/2 amplitudes
First look at Dalitz-plot asymmetry |

******1.0**

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Analysis of KS  e decays

- 2-track vertex at IP tagged by *K**L* crash
- TOF PID from associated clusters

- *t*  *t*exp(*e*)  (ns)

***e***************

***********e*******

*E*miss – *p*miss (MeV)

- Close kinematics: ***E*****miss**** ******** *****p*****miss**** = 0**
- Fit with MC spectra for *e* and 
- MC includes radiative processes

- *t*  *t*exp(*e*)  (ns)

*N**e* = 23328255

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## KS  e, e

**KLOE preliminary**
- 450 pb1 ’01+’02 data
- Evaluation of systematic errors nearly complete

**BR(*************e*************) = (3.54 ******** 0.05 ******** 0.05) ****× ****10********4**
**BR(*************e*************) = (3.54 ******** 0.05 ******** 0.04) ****×**** 10********4**
**BR(*************e*************) = (7.09 ******** 0.07 ******** 0.08) ****×**** 10********4**

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## KS  e decays – CP and CPT

**KLOE preliminary**
***A******S***** = (********2 ******** 9**** ******** 6) ****×**** 10********3**
**First measurement of *****A******S*****!**

**Compare to results for *****A******L***
- KTeV	(3.322  0.058  0.047) × 103
- NA48	(3.317  0.070  0.072) × 103

- If *CPT* conserved,  *A**S* = 2 Re 
***A******S ********** A******L ********* 0 implies***** CPT ***

**With 2 fb********1****, KLOE can measure *****A******S***** to 4 ****× ****10********3**
- For competitive limit on *CPT* violation, need *A**S* to 1.5 × 103  20 fb1
- cf. CPLEAR ’98  Re  = (3.0  3.4) × 104

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Vus from K3 decays – CKM unitarity

**Most precise test of CKM unitarity possible at present from 1****st**** row:**

- |*V**ud*|2|*V**us*|2|*V**ub*|2    |*V**ud*|2|*V**us*|2    1

*V**us** from K**3** decays – CKM unitarity*

**To extract |*****V******us*****| from *****K*****0*****e*****3**** decays:**

- 0.5%

- 0.4%

- 0.4%

- 0.8%

***Nominally:***

- exp

- th

*K**e*3 BRs normalized using current PDG BR values (or ratios)
- Older measurements’ inclusiveness of radiative processes uncertain
- Good values of , *L* important

***However:***

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## KL decays – Present knowledge

**Knowledge of 4 main *****K******L***** BRs currently dominated by 3 measurements:**

**4% discrepancy between measurement and expectation for *****R*********/*****e*****:**

*R*/*e* 

*R*/*e*  	0.671  0.011 	direct measurement for *K* [KEK-E246 ’01]
*R*/*e* calculable from slopes + and 0 of vector and scalar form factors:
- 	0.670  0.002	if 0  0.0183  0.0013 [ISTRA+ ’04]
- 	0.668  0.006	if 0  0.017  0.004, from one-loop PT

-  0.697  0.010  [Argonne HBC ’80]

- [NA31 ’95]

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## KL decays – Status and objectives

**Precisely measure absolute branching ratios to ******** 1%**
*K**L* beam tagged by *K**S* 
*K**L* vertex reconstructed in DC
- PID using decay kinematics
- Fit with MC spectra including radiative processes and optimized EmC response to //*K**L*
**450 pb********1**** = ****	****3 ****×**** 10****6**** *****K******L**********e*******
**	****events detected**
- In progress:
- Analysis with newly upgraded MC
- Selection efficiency as a function of *K**L* vertex position and momenta of decay products

- × 103

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Mean life of the KL

- PDG avg. (Vosburg, ’72): 	*L* = 51.5 ± 0.4 ns
**KLOE 440 pb********1****:****	*********L***** = 51.15 ******** 0.20****stat**** ns**
**14.5M *****K******L***** ******** **************************** evts**

*Very preliminary*
*Stat. error only*

*K**L* mean life “hard” to measure
- Can’t stop *K**L*’s!
- High *K**L* momentum at fixed-target setups means limited lever arm

|  |  | FV |
| --- | --- | --- |
| NA48 | 220 | 0.03 L |
| KLOE | 0.22 | 0.3 L |

- Using* K**L*  
- Require  3 ’s  (*L**K*) uniform
- *L*() ~ 2 cm

***L*****/*********c***** (ns)**

- 58-150 cm
- 0.3 *L*

**× ****10****2**

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Charged kaons – tagging

- 6 × 105 tags/pb1 for measurement of absolute BR’s

*Charged kaons – tagging*

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Charged kaons – K3 decays

- 0

- 8000

- 4000

- 0

- 20000

- 40000

***m************* (MeV****2****)**

** ********  ****Data**
** ********  ****MC fit**

***K*************0*****e***********

**Measure***** K*********3**** BRs to ******** 1%**
- Reconstruct decay vertex in DC
- Reject *K*  0 and  by cut on *p*
- Require 2  clusters in EmC with TOF consistent with DC vertex position
- Obtain charged-daughter mass spectrum from TOF measurement:

**In progress:**
- Evaluation of selection bias due to interference from tagging decay
- Analysis with MC upgrade (radiative processes, optimized EmC response to /)

**450 pb********1 ******** 3 ****× ****10****5**** *****K**********e*****3**** events**

*Charged kaons – K**3** decays*

***K*************0**************

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Mean life of the K

**PDG avg.**  = 12.385	 0.025 ns
- 	 0.2%

*Error scaled by 2.1*
*Understated even so?*

- Tag with *K*  
- Measure *L* from *K*   vertex
- *L*(*K*) = 3 mm
**450 pb********1**** ******** 70 ****× ****10****6**** events**

- Measure decay time independently with    vertex:
- *L*() = 3 mm (after kinematic fit)
- Also useful for efficiency studies

**Coverage: ~1.7 **********
**90 cm < *****L***** < 250 cm**

*L**K* (cm)

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Reprise: KLOE in 2004

**Present status:**
- Sensitivity to *K**S* BRs at 107 level (preliminary UL for *K**S*  3)
- Measurement of BR(*K**S*  *e*) mode at the % level, *A**S* to 102
- Measurements of BRs for semileptonic *K**L* and *K* decays in progress
**Expect 2 fb********1**** of integrated luminosity in 2004, will allow:**
*A**S* with a total accuracy of  4 × 103, first test of SM prediction *A**S* = 2 Re 
- Limit on BR(*K**S*  3) at 108 level, BR(*K**S*  ) to 20%
***First studies of CP/CPT parameters of K******S******K******L****** system via interference***

**Data taking restarted 27 April**
**Currently, ****L****peak**** = 4 ****× ****10****31**** cm********2**** s********1**
**L****avg**** > 10****32**** cm********2**** s********1**** expected after tuning**

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## (KS  ())/(KS  )

**PDG ’02 ****	****	****	****2.197 ******** 0.026 (avg.)**
**KLOE ’02****	****	****	****2.236 ******** 0.003 ******** 0.015**
- 17 pb-1 ’00 data, *Phys. Lett.* **B538** 21
**Error will be reduced to 0.1%**

- (*K**S** ** *())/(*K**S** ** *)

- First part of double ratio for Re 
- Provides information on EM isospin breaking in *K*   decays
- Can extract 0 – 2 if effective *E* cutoff known for  channel

| 0 – 2 |  |  | 0 – 2 |  |
| --- | --- | --- | --- | --- |
| PDG widths
Cirigliano et al. ’01 | (568) |  | (456) | PT estimate 
Gasser & Meissner, ’91 |
| KLOE ’02 value for 
()/() | (483) |  | (47.71.5) |  scattering 
Colangelo et al. ’01 |

*E* (MeV)

- Current measurement fully inclusive
*d*BR()/*dE* in progress

- 

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Prospects for 

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## CP/CPT studies: longer term prospects

*CP/CPT studies: longer term prospects*

**With sufficient ****L****, KLOE can use both absolute BR measurements and interferometry to measure many *****CP***** & *****CPT***** violation parameters of *****K******S******K******L***** system**

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## A first glance at interference

*A first glance at interference*

**KLOE preliminary**
**340 pb********1**** ’01 + ’02 data**
- Fit with PDG values for *S*, *L*
- 2/d.o.f. = 43.7/47
*******m***** = (5.64 ******** 0.37)****×****10******** ******** s********1**
**PDG ’02: (5.301 ******** 0.016)****×****10******** ******** s********1**
**First observation of quantum interference in relative decay-time distribution of *****K******S*****, *****K******L***

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Why K   is out of reach

- Estimates based on 	**L**** ****= 10****35**** cm********2**** s********1**
- 	**1000 fb********1****/yr**

**BR****SM**** = (2.8 ******** 1.0) ****× ****10********11**
- Events produced	56
- —tagged,  = 70% 	39
- —with *K**L* in FV,  = 30% 	13
- —selected,  = 10% 	**1.3**

**Total ********L**** *****dt***** = 2000 fb********1**
**2 ****× ****10****12**** *****K******S******K******L***** pairs**
**6 ****×**** 10****12**** *****K********* decays **

**L**** = 10****35**** cm********2**** s********1**** and ********sel**** = 10% “aggressively” optimistic**
**Not competitive with hadron machines in any case**

**BR****SM**** = (7.2 ******** 2.1) ****×**** 10********11**
- Events produced	430
- —tagged,  = 20% 	86
- —with *K* in FV,  = 60% 	52
- —selected,  = 10% 	**5.2**

***K******L***** ******** **************

***K*******************

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## DANE and KLOE: future upgrades

- Next-generation DANE (*s* = *m*) with L up to 5 × 1034 cm2 s1 would allow competitive measurements of
- Rare *K**S* decays
*CP*/*CPT*  parameters via *K**S**K**L* interference
- Would require a KLOE upgrade:
- Vertex detector!
- New DC: higher segmentation (possibly smaller)
- Upgrade to EmC: added depth, higher readout granularity

***Currently moving from discussion to proposal stage***

***Proposed main-ring layout for DA************NE upgrade***

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## DANE upgrade scenarios

*DA****NE upgrade scenarios*

- ‘05

- ‘06

- ‘07

- ‘08

- ‘09

- ‘10

- ‘11

- ‘12

- ‘13

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Kaon physics with KLOE: summary

**KLOE is analyzing a unique data sample: 450 pb********1**** of ********decays**
- Lowest limit on BR(*K**S*  30)
- First measurement of the* K**S* semileptonic asymmetry
- Measurements of *K**L*, *K* branching ratios, *V**us  *forthcoming
**KLOE expects to collect 2 fb********1 ****in 2004-2005**
- Will begin to exploit KLOE’s capability for *CP*/*CPT* measurements
- Limit on *K**S*  30 at the 108 level
*K**S* semileptonic asymmetry to 4 × 103
- First studies of *K**S**K**L* system with interference
**A feasible and competitive program exists for a ******** factory with ****L**** ******** 10****33****-10****34 ****cm********2 ****s********1**
- Precise measurements of rare *K**S* decays
- Comprehensive survey of *CP*/*CPT* violation in *K**S**K**L* system via interference

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Additional information

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Search for KS– sidebands

******2****3******

- 0

- 0

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- 200

- 60

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- 40

- 300

*Search for K**S*– *sidebands*

**Data (450 pb********1****)**
**MC *****K******S***** ******** 2**********
**MC *****K******S***** ******** 3************ (BR = 10********5****)**

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Search for KS– sidebands

******2****3******

- 0

- 0

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- 500

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**Data (450 pb********1****)**
**MC *****K******S***** ******** 2**********
**MC *****K******S***** ******** 3************ (BR = 10********5****)**

*Search for K**S*– *sidebands*

******2****3******

**Data**
**MC *****K******S***** ******** 3**********

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******2****2******

- 1000

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- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Search for KS– sidebands

******2****3******

- 0

- 0

- 50

- 100

- 30

- 10

- 20

- 150

**Data (450 pb********1****)**
**MC *****K******S***** ******** 2**********
**MC *****K******S***** ******** 3************ (BR = 10********5****)**

*Search for K**S*– *sidebands*

******2****3******

**Data**
**MC *****K******S***** ******** 3**********

- 0

- 0

- 20

- 40

- 80

- 60

- 40

- 10

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******2****2******

- 200

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- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Measurement of KS mass

**497.583 ******** 0.005 ******** 0.020 MeV**
**KLOE Note 181**

**2001 ******** peak scan: 29 pts, ****0.5 pb********1**

*Measurement of K**S** mass*

- Momentum scale calibrated to CMD-2 ’01
*m*() = 1019.4830.0110.025 MeV

**CMD-2**

**NA48**

**KLOE**

- MeV

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Extraction of 0 – 2

**Conventional extraction of strong phase shifts from *****K******S*****, *****K************* decays:**

| 0 – 2 |  |  | 0 – 2 |  |
| --- | --- | --- | --- | --- |
| PDG widths
Cirigliano et al. ’01 | (568) |  | (456) | PT estimate 
Gasser & Meissner, ’91 |
| KLOE ’02 value for 
()/() | (483) |  | (47.71.5) |  scattering 
Colangelo et al. ’01 |

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## K

- Dalitz slopes give information on *I* = 1/2, 3/2 amplitudes for *K*  3 decays

*K*

**BR(*****K*********************************)**
**PDG ’02 fit****	****	****(1.73 ******** 0.04)%**
**KLOE preliminary ****hep-ex/0307054**
- 441 pb-1 ’01+’02 data
- 187 pb-1 counted as signal
**(1.781 ******** 0.013 ******** 0.016)%**

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Ke (Ke4)

*K**e* (*K**e*4)

**KLOE preliminary ****(441 pb****-1**** ’01 + ’02 data)**
**BR**(***K******e*****4******)**= **(**2.43 ******** 0.20 ******** 0.22**)** ****×**** 10**** –5**
**PDG fit: (2.1 ******** 0.4) ******** ****10****-5**
**Best measurement: (2.54 ******** 0.89) ****× ****10****-5**

- Assuming *I* = 1⁄2:
- (*K**4*) = 2(*K**4*) = 1⁄2(*K**4*0)
- |*F*(*K**4*)| = |*F*(*K**4*)|
- For *K**4*, *m* = 0:  = *C**F *|*F*|2 |*V**us*|2
- Angular distribution in ,  plane allows determination of 00 – 11

- 2 from kinematic fit

***K**********4******** **	**K*  
***K**********4******* *	**K*  
***K**********4*****0*** **	**K**L*  

*N*obs = 40720
*N*bkg = 15218

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## DANE upgrades and 2004 running

**Run plans**
- Run started 27 April
- Increase peak luminosity and reach **1.5 ****× ****10****32 ****cm********2****s********1 **
- Run **KLOE** for **~1 year** with goal of collecting **2 fb********1**

**New KLOE IR**
- Rotation for low- quads
- Decrease *x *and coupling
- Allow changes to KLOE field
**Pole-shims on wigglers**
- Eliminate octopole terms

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Kaon physics at KLOE

| KS   | Preliminary results, this talk |
| --- | --- |
| KS  ()
KS   | Phys. Lett. B538 21 (2002)
Update with ’01-’02 data in progress |
| KS e | Phys. Lett. B535 37 (2002)
Preliminary update with ’01-’02 data, this talk |
| K0 mass | KLOE Note 181 (http://www.lnf.infn.it/kloe) |
| KL  KL   | Phys. Lett. B566 61 (2003) |
| KL  e
KL  
KL   | In progress |
| Vus | In progress |
| CP violation & interference | In progress |
| K+   | Preliminary results (hep-ex/0307054) |

*Kaon physics at KLOE*

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Hadronic physics at KLOE

| meson parameters | Preliminary results |
| --- | --- |
|  | Phys. Lett. B561 55 (2003) |
|  | Preliminary results |
|  | hep-ex/0402011, submitted to Phys. Lett. |
|  | Phys. Lett. B541 45 (2002)
Update with ’01-’02 data in progress |
| f, a | Phys. Lett. B536 209 (2002), B537 21 (2002)
Update with ’01-’02 data in progress |
| (ee hadrons) | Preliminary results (hep-ex/0307051) |

*Hadronic physics at KLOE*

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Status: (ee  hadrons) and a

*	****a************* ****= (389.2 ******** 0.8****stat**** ******** 4.7****syst**** ******** 3.7****th****) ****× ****10********10**
- Comparison with CMD-2 in the energy range 0.37 < *m*2  <0.93 GeV2:
- KLOE* 	**(376.5 ******** 0.8****stat**** ******** 5.4****syst+th****) ****× ****10********10**
- CMD-2	**(378.6 ******** 2.7****stat**** ******** 2.3****syst+th****) ****×**** 10********10**
- KLOE results **confirm** ~10% discrepancy between *e**e* data and  data for *m*2  > 0.6 GeV2

- Error on model dependence FSR and VP not included!

*Status: *(*e**e** ** hadrons*)* and a*

**141 pb********1**** KLOE ’01 DATA – PRELIMINARY **

***Publication ready for final collaboration review***

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York

## Status: (ee  hadrons) and |F|2

**|*****F*********|****2**

*Status: *(*e**e** ** hadrons*)* and *|*F*|2

**141 pb********1**** KLOE ’01 DATA – PRELIMINARY **

- Recent results from KLOE at DAFNE - M. Moulson - CIPANP 2003, New York