1)Short range future 2)Medium range future B factories? 3)Long range future ILC? INFN – LNF will...
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Transcript of 1)Short range future 2)Medium range future B factories? 3)Long range future ILC? INFN – LNF will...
1) Short range future
2) Medium range future B factories?
3) Long range future ILC?
INFN – LNF will be part of the international effort on future accelerators
INFN National Laboratory LNF
Some basic concepts (and numbers)
A meson decaying at rest produces pairs of neutral or charged kaons with branching ratios of ~34% and
~49%,respectively
Daughter particles are monochromatic,
Pch ~ 125 MeV/c, Pneu ~ 110 MeV/c
In resonant e+e collisions, particles fluxes are:
1.5 x 106 K± pairs/pb1
1. x 106 KS KL pairs/pb1
Parity conservation imposes the neutral state to be KSKL
100 fb-1 about 10 10 Kaon pairs
K and factory
FRASCATI Short Range Future; 3 years
DAFNE Luminosity projection
Starting from 1.5*10^32, 2fb-1/year1) Ion Cleaning Electrodes shield-removal2) Higher positron current3) New interaction region4) wigglers linearization5) Transfer lines upgrade (continuos injection)
To be discussed:1)Crab cavities 2) Waist modulation (RF quads)
Final luminosity 3 times higher? Cutting edge accelerator technology
FRASCATI Less short Range Future 2010
Change of machine layout, insertion of
Superconducting cavities Superconducting wigglers Ramping Dipoles New vacuum chamber
Energy (cm) (GeV) 1.02 2.4
Integrated Luminosity per year (fbarn-1) >10
Total integrated luminosity (5 years, fbarn-1)>50 >3
Peak luminosity > (cm-1sec-2) >8 1032 >1032
DANE 2 layout
IR
Wigglers
rf
TDR in preparation: necessary to submit the project
PHYSICS case• K physics (from 2fb-1 to 50fb-1)• Nuclear physics• Nucleon form factors • Kaonic nuclei• Total cross section• physics• QM with kaon interferometry• Test of ChPT• Intense I.R Synchrotron Light Source
Conceptual Design Report of the accelerator end 2006
Preliminary Letter of Intent for experiments are in preparation. We need to have an international collaboration.
Experiment Letter of Intent end 2006
We ask for the INFN decision By the end 2006
International collaboration on the machine design is highly desirable
Feasibility study of hyper B-factory and synergy with ILC
CTF3 at CERN going on
Participation to the R&D for the ILC. Member of the GDE team
Construction FEL injector systems
It is important to have local laboratories working, in collaboration, on several projects
It is wrong (to my opinion) to concentrate all our resources on a single project
TOTAL CROSS SECTION R
Radiativereturn
Energy Scan
a = (116592080 ± 50stat ± 40sys) × 10-11
had(5) (Mz
2) =
0.02800 (70) Eidelman, Jegerlehner’95
0.02761 (36) Burkhardt, Pietrzyk 2001
0.02755 (23) Hagivara et al., 2004
0.02758 (35) Burkhardt, Pietrzyk 6-05
R a
R (5)had
1) Total cross section from threshold to 2.5 GeV: scan in √s e/o ritorno radiativo
Hadronic correction to g-2 , running of
2) Spectroscopy (vector mesons)3) physics:
Pseudoscalars , , ’ Scalars (,…) , , KK
4) Time-like form factors: Barioni: n , p , , Mesoni , K
5) Test of CP + QM
6) Radiative decays Mixing / ’ e ’ decays scalar meson : f0(980), a0(980),
7) KN physics
Dafne2 Physics (non K)
F. Bossi, CSN1, Frascati 14 Ottobre 2005
CPT violation: the “standard” path
In the standard description of the neutral K system, a charge asymmetry in semileptonic KL and KS decays is predicted due to
CP and (possibly) CPT violation
L = 2Re(K )
S = 2Re(K ) +
CPT is violated ifS ≠ L
The most recent measurement are:
S = (1.5 ± 10 ± 3) x 103 KLOE, ~400 pb1
DAFNE-2 10-4
L = (3322 ± 58 ± 47) x 106 KTeV, 02
F. Bossi, CSN1, Frascati 14 Ottobre 2005
CPT and decoherence
It has been suggested that quantum gravity could give rise to modification of standard QM, observed in decoherence effects
together with CPT violation
This can be observed in deviation of the behaviour of entagled systems (like KSKL from decays) from the one predicted by
standard QM
F. Bossi, CSN1, Frascati 14 Ottobre 2005
CPT and decoherence: the EHNS model
Ellis, Hagelin, Nanopoulos and (independently) Srednicki set up an evolution equation of the neutral K system containing three new
CPT violating parameters ,, with dimensions of energy
Naively, one expects ,, ~ O(MK2 / MPlank) ~ 10-20 GeV
Peskin and Huet worked out the expression of the usual double decay intensity of the KSKL pair from decays in the EHNS
framework
There appear new bizarre terms in the distribution which allow to extract experimentally limits (or measurements) of these new
parameters by proper fitting
Fixing the EHNS parameters
The EHNS parameters have already been constrained by CPLEAR results
= ( 0.5 ± 2.8) x 1017 GeV
= ( 2.5 ± 2.3) x 1019 GeV
= ( 1.1 ± 2.5) x 1021 GeV
KLOE can reach equal sensitivity on , with present data sample
just with the ++ channel
F. Bossi, CSN1, Frascati 14 Ottobre 2005
(/S) (/S) (/S)
fb1 fb1 fb1
• Present KLOE
• KLOE + VDET
Fixing the EHNS parameters
With 20 fb1 one can dramatically improve, especially on and
In the plots below the horizontal line is CPLEAR, VDET means vert = ¼ S
F. Bossi, CSN1, Frascati 14 Ottobre 2005
CPT and Bose statistics: the BMP model
Bernabeu, Mavromatos and Pavassiliou argued that in presence of CPT violation induced by quantum gravity the concept of
antiparticle has to be modified.
In this case the KSKL state from decays does not strictly obey Bose statistics, thus modifying the final state wave function
І i > = C {( І KS(+)> І KL()> І KL(+)>І KS()>) + ( І KS(+)> І KS()> І KL(+)>І KL()>)}
The complex parameter quantifies the departure from Bose statistics, in a formalism in which the time evolution of the state
is still described by the equations of standard QM
F. Bossi, CSN1, Frascati 14 Ottobre 2005
Naively, ІІ ~ O(MK2 / MPlank )1/2 ~ 10-3 104
Measuring the parameter
F. Bossi, CSN1, Frascati 14 Ottobre 2005
The parameter can be measured by a fit to the decay time distribution of the KSKL pair to ++
Arg() = 0,
ІІ = 1,2,3 x 103
t (S units)
fb1
• Present KLOE• KLOE + VDET
A. Di Domenico
A. Di Domenico
time-like form factors
p 1.876
n 1.879
2.231 N(p- , n0)
2.378 N(p0 , n+)
2.385
2.395 N(n-)
2.464 N
2.630 0
2.643 -
(1)Misura sezione d’urto e+e- NN |G|2
22
22 2
3
4sG
s
MsG
s E
N
M
22
222
2
sin4
cos14
sGs
MsG
s
C
d
dE
NM
(2) Angular distribution of theoutgoing nucleon |GE|/|GM|
Accessible nucleons:
(3) Measurement of the outgoingnucleon polarization (q2) =E - M
F. Bossi, CSN1, Frascati 14 Ottobre 2005
NA48/1 has measured BR(KS ) = (2.78 ±0.06±0.04)x106
This result differs from predictions of ChPT at O(p4) by 30%
A preliminary analysis shows that KLOE can reach a statistical accuracy of ~ 4% with the present data sample.
A projection to 20 fb1 would give an accuracy better than 1%
KS : a test for ChPT
Lepton Flavour Universality K e / K from 0.01 to 0.001
K will giveVus/Vud to 0.001
QuickTime™ and aTIFF (LZW) decompressor
are needed to see this picture.
Transfer Lines Upgrade
Motivation:e+ e- continous injection in collision
kicker
e- line
e+ line
N-NEnergy per beam E GeV 0.51 1.2
Circumference C m 100 100
Luminosity L cm-2 sec-1 8 1032 1032
Current per beam I A 2.5 0.5
N of bunches Nb 150 30
Particles per bunch N 1010 3.1 3.4
Emittance mm mrad 0.3 0.6
Horizontal beta* x m 1 1
Vertical beta* y cm 1 1.5
Bunch length L cm 1 2
Coupling % 1 1
Energy lost per turn Uo (keV) 25 189
H damping time x (msec) 13 5
Beam Power Pw (kW) 62 (55w + 7d) 94.6 (42w + 53d)
Power per meter Pw/m (kW/m) 8.6w + 0.5d 8.4w + 3.8d
RF system
A possible candidate cavity
500 MHz SC cavity operating at KEKB
R&D on SC cavities with SRFF experiment in DAFNE
SC wigglers
Technology developed for Light sources and colliders
ELETTRA SC wigglerBuilt by BINP in operation since 2003