Achille Stocchi Alessandro Variola Grenoble 8 Janvier 2009
Why the choice of a Super Flavour Factory, asymmetric ? Is a Super Flavor Factory (SFF) a discovery machine in LHC era ? Why >10 36 luminosity needed ? Is SFF complementary to LHC ? Would not be LHCb enough to perform flavour studies ? .. How to built such a Flavour Factory ?
B factories have shown that a variety of Asymmetric measurements can be performed in the clean B factory environment. The systematic errors are very rarely irreducible and can almost on all cases be controlled with High luminosity control samples. (up to..50- 100ab -1 ) Many measurements can be done at different Flavour factories energies ( charm/ threshold, U(5S) )
Special specific meeting to answer the IRC questions on physics and sharpen the physics case 49 signers ~24 institutions Super Flavour Factory 3 Chapters : Physics Case > 10 36 cm -2 sec -1 >15ab -1 per year Detector (today ~10 34 cm -2 sec -1 Babar~400fb -1 Belle~700fb -1 ) Machine Background machine ~ to the present one 320 signers 444 pages ~80 institutions Possibility of running at lower ( - charm) and higher energy (B s )
B physics @ U(4S) Possible also at LHCb Similar precision at LHCb
Charm at U(4S) and threshold physics To be evaluated at LHCb B s at U(5S)
Exploration of two frontiers Relativistic path Quantum path Crucial : Center - of - mass energy Crucial : Luminosity SuperB
The problem of particle physics today is : 10 16 TeV where is the NP scale ~ 0.5, 1 The quantum stabilization of the Electroweak Scale suggest that ~ 1 TeV LHC will search on this range What happens if the NP scale is at 2-3..10 TeV bq naturalness is not at loss yet Flavour Physics explore also this range e f f We want to perform flavour measurements such that : - if NP particles are discovered at LHC we able study the flavour structure of the NP flavour structure of the NP - we can explore NP scale NP scale beyond the LHC reach 10 34 luminosity to have measurable effects (anyhow) if NP particle with masses at the EW scale 10 36 luminosity to have measurable effects (anyhow) if NP particle with masses at the TeV scale
In SM Today SuperB+Lattice improvements = 0.163 ± 0.028 = 0.344 ± 0.016 Improving CKM is crucial to look for NP = ± 0.0028 = ± 0.0024
leptonic decay B l SM expectation Milestone : First leptonic decay seen on B meson First test can be done, not yet precise ) = (0.85 ± 0.13)10 -4 BR(B SuperB Exp. likelihood BABAR+BELLE ) = (1.31 ± 0.48)10 -4 BR(B (+) systematically limited (to be studied with the improved dete ctor) Br(B up to 3 - 4% (below limited by systematics ) ..probably not with improved detector. Br(B can be measured with the same precision not limited by syst .
Higgs-mediated NP in MFV at large tan 2ab -1 10ab -1 tan tan 75ab -1 SuperB - 75ab -1 2ab -1 M H ~0.4 - 0.8 TeV M H ~1.2 - 2.5 TeV for tan ~30 - 60 for tan ~30 - 60 tan tan Importance of having very large sample >75ab -1
MSSM+generic soft SUSY breaking terms New Physics contribution Flavour - changing NP effects in the squark propagator (2 - 3 families ) ~ NP scale SUSY mass g ~ ~ s flavour - violating coupling b s b d 23 LR | | LR 23 In the red regions the 1 are measured with a significance >3 away from zero 10 -1 | | LR = (0.026 ± 0.005) 23 Arg( 23 ) LR =(44.5 ± 2.6) o 10 -2 (TeV) m 1 10 gluino 1 TeV
10ab -1 75ab -1 Determination of Susy mass insertion parameter ( 13 ) LL with 10 ab - 1 and 75 ab -1 Importance of having very large sample >75ab -1
GOLDEN MODES X X X- CKM X X X X- CKM X X The GOLDEN channel for the given scenario Not the GOLDEN channel for the given scenario but can show experimentally measurable deviations from SM.
Branching fraction Br(B K ) Today The best UL < 14 10 -6 SM BF= 4 10 -6 B K * B K , ( K K ) S ~10ab -1 are needed for observation >50ab -1 for precise measurement
Lepton Flavour Violation . We can gain a very important order of magnitude 10 -8 10 -9 Complementarity with e LFV from CKM SO(10) MSSM LFV from PMNS 10 7 BR ( SuperB M 1/2 ~10 -13 MEG sensitivity e
Charm Physics Charm physics using the charm produced at (4S) Consider that running 2 month at threshold 0.3 ab -1 Charm physics at threshold we will collect 500 times the stat. of CLEO -C Strong dynamics and CKM measurements @threshold(4GeV) ~1%, exclusive V ub ~ few % D decay form factor and decay constant @ 1% syst . error on from Dalitz Model <1 o Dalitz structure useful for measurement D mixing Rare decays FCNC down to 10 -8 Better studied using the high statistics collected at (4S) @threshold(4GeV) CP Violation in mixing could now addressed
NOW CP Violation in charm SuperB
Summary SFF can perform many measurements at <1% level of precision Precision on CKM parameters will be improved by more than a factor 10 NP will be studied (measuring the couplings) if discovered at LHC if NP is not (or partially ) seen at the TeV, SFF is the way of exploring NP scales of the several TeV (in some scenario several (>10 )TeV..) and do not forget SFF is also a Super - Super -charm factory ..and also spectroscopy, variables sensitive to polarization, CP violation in and D
Slides prepared with the help of Alessandro Variola
2 1 f N r L D The Crab waist scheme 2 1 x y N z ( ) D z tg 2 To have large luminosity x x y 1) Single passage : D (disruption) high [profit of beam -beam effects (pinch)] small x , y 2) The beam has to be re- utilized in an accumulation ring to maxime f r D small 3)To keep D small and small x , y we also need small z Crossing angle interaction Swap the x with z requirements with a crossing angle Hourglass effect from y z In this scheme we obtain the possibility to work with very small beta But : Introduces B(x)-B(y) and S(z)-B(x,y) resonances (strong coordinates coupling). Crab Waist pensaci tu ( Fait quelque chose pour moi )
x and (finally) to crab the waist: Y e- e+ 2Sx/ 2Sz* z 2Sz 2Sx Qy 0.2 Why? Crabbed waist removes betatron coupling resonances 0.18 introduced by the crossing angle ( betatron phase and amplitude 0.16 modulation) 0.14 Conceptually simple : restore the B - B effects to those we have quadrupoles focalising in 2D (compensate the effects of the crossing 0.12 angle 0.1 0.08 Vertical waist has to be a function of x: Crabbed waist realized with 0.06 a sextupole in phase with the IP in X and at /2 in Y slight luminosity Qy increase. 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2
D.Shatilov s (BINP), ICFA08 Workshop Much higher luminosity! 1 1 0.8 0.8 0.6 0.6 0.4 0.4 0.2 0.2 0 0 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 Crab Waist On: Typical case (KEKB, DA NE): 1. large Piwinski angle >> 1 1. low Piwinski angle < 1 2. y comparable with x / 2. y comparable with z
Possibility of energy scaling to work at the /charm center of mass with an estimated luminosity loss of an order of magnitu de. 10 36 cm -2 sec -1 15ab -1 per year 3,4 ×10 36 cm -2 sec -1 ~50ab -1 per year - Other possibilities to further improve the luminosity not disc ussed here.. - Possibility of having two Interaction Regions (even better for the machine stability)
In a condense table PEPII KEKB SuperB current 2.5 A 1.7 A 2.3 A betay 10 mm 6 mm 0.3 mm betax 400 mm 300 mm 20 mm Emitx ( sigmax ) 23 nm ~ 20 nm 1,6 nm y/x coupling 0,5 - 1 0.25 % 0,25 % Bunch length 10 mm 6 mm 6 mm 16/32 msec 16/32 msec 16/32 msec y 0.07 0.1 0.17 L 1.2 10 34 1.7 10 34 1 10 36
Test of these new colliding schemes in Frascati From design . to simulation gamma Bhabha monitor Calorimet ers Quadrupoles QD0 Y- tube Quadrupo le Sputnik Soyuz R M I M I R MIR Sputnik Soyuz QD0 Siddharta Detector and MIR shields Calorimeters Shields
To Reality GEM Positron / Electron Calorimeters + e e - Photon Calorimeter B. VIAUD 1/11/2009 28
E. Paoloni Without Crab sextupoles waist line is orthogonal Crab - sextupoles OFF to the axis of one bunch With Crab sextupoles Crab - sextupoles ON waist moves to the axis of other beam All particles from both beams collide in the minimum y region, with a net luminosity gain
Effect of crab sextupoles on luminosity LUMINOMETERS A huge work on machine optimization has been done and is still in progress in term of feedbacks systems tuning, background minimization and tuning of the machine luminosity Crab OFF Transverse beam dimensions at the Synchrotron Light Crab ON Monitor e - x y e + Blow - up in beam sizes and decrease in Bhabha rates observed when crab sextupols for one ring OFF (other ring ON)
95 Bunches Luminosity Specific Luminosity Luminosity (10 28 cm -2 s -1 ) Specific L (10 28 cm -2 s -1 /A 2 ) N L b peak 2 1 2 [ / ] L cm s A sp I I
Comparison of KLOE runs and first Siddharta results Amp 2 / N bunch KLOE run Upgrade We are still running y * (cm) 1.7 0.65 x * (cm) 170 20 y * ( m) 7 2.6 700 200 x * ( m)
15 November 2008. A date to remember ! A day at ~ 2.1 10 32 Colliding at best I+I- ~ 0.9 × 0.9
And after this we are passing from record to record Few hours >3 10 32
The experiment is still on going
ILC synergy .. How to extrapolate the Dafne results to SuperB
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