SLac July 25,2008 Marcello A. Giorgi 1 SuperB status (process) US PI Meeting Marcello A. Giorgi...

SLac July 25,2008 Marcello A. Giorgi1

SuperB status (process)

US PI Meeting

Marcello A. Giorgi

Slac- July 25,2008


From Elba

Dainton Committee has delivered his Report in Short Version.

• Positive outcome:– No objection on the physics program and motivations

for high lumi (>10 36 and 75 ab-1 in 5 years)– Polarization an important tool– Very encouraging the positive results from Dafne tests

in Frascati.– No showstopper identified

GO AHEAD!


MiniMac in place

A Machine advisory committee has been set up by R. Petronzio.

J. Dorfan Chair

First meeting in Frascati July 16 and 17 ,2008.

VERY POSITIVE OUTCOME.

I am authorized to make public the closout transparencies of Jonathan


Mini-MAC Committee

• Klaus Balewski (DESY)• John Corlett (LBNL)• Jonathan Dorfan (SLAC, Chair)• Tom Himel (SLAC/on sabbatical at DESY)• Claudio Pellegrini (UCLA)• Daniel Schulte (CERN)• Ferdi Willeke (BNL, by phone)• Andy Wolski (Liverpool) • Frank Zimmermann (CERN)

(Stuart Henderson was unable to attend)


Mini-MAC Charge

(a) to perform an initial assessment of the current design to review its viability to achieve the design operating parameters. This initial assessment would provide clear guidance regarding perceived weaknesses in the design and would further identify those areas in need of more detailed design work and focused R&D. The goal would be to complete this initial review within the next three months (As of June 2008). (b) to provide initial guidance on potential site-specific issues for Super B at the Tor Vergata site.(c) to provide ongoing, periodic assessments of the design as it matures over the subsequent nine months.


NEEDS for Asymmetric machine (7Gev (e-) + 4 GeV (e+)).

• SuperB with peak luminosity of 1036s-2 cm-2 , integrating 75 ab-1 in 5 years.

Background not exceeding too much the present Babar, thanks to low current, crossing angle and a careful design of the Interaction Region.

• One beam 80% polarized (High Energy).

• Possibility of running asymmetric at Charm threshold.

(Priorities for design: Taken from Marcello Giorgi’s Talk to Mini-MAC)


• Very exciting project -- Committee is exhilarated by the challenge

• Physics requirement of 10**36 cm-2 sec-1 or 75 ab-1/5yr is very demanding– Requirement of polarization potentially adds

complexity• Imaginative and ambitious design -- Committee

endorses the design approach. Design offers flexibility to either raise the luminosity or compensate for surprises

• Excellent work by a relatively small group, many of whom have full-time “day jobs”

• Seeman’s summary – “areas for further concentration”: Committee agrees these cover most of the essential tasks needed before the design can be fully vetted at the performance requirements

General Comments J.D. Closeout report


• Committee considers the SINGLE MOST ESSENTIAL ingredient for moving forward is the formation of a sanctioned management structure which formally incorporates a dedicated machine design team. The team members must have the strong support of their home institutions to work on the design. The team needs a designated leader, who is as close to full time as is possible

• The project is in need of a formal baseline which is managed with change control tools. This cannot be accomplished successfully without the management structure

RecommendationsJ.D. Closeout report


• The Committee sees no glaring showstoppers with respect to achieving the design performance. However, in several key areas, more work is needed before the design can be blessed

• The Committee, in consultation with the SuperB team, established a list of topics that are essential for the team to address before the Mini-MAC will be in a position to state with confidence that the machine can achieve its physics goals. It is the Committee’s opinion that these items can be prioritized in such a way that the machine feasibility can be judged six months from now

(This assumes that the management structure is formed by late September and that more resources are provided)

Nest Steps for Near-term WorkJ.D. Closeout report


Nest Steps for Near-term Work (cont.)

• The Committee focussed on the near-term tasks. The list that follows is by no means the totality of work needed for a TDR

J.D. Closeout report


Meanwhile

Nakada Subcommittee appointed by ECFAIs at work.They were in Elba and attended the meetings

with Labs and agencies.They met with Steering Committee membersTheir charge is :• verify the compatibility of SuperB project with

the European Priorities for HEP set in Lisbon by Cern Strategy group.


INFN National annual Meeting

INFN PI and lab directors met for 2 days in Florence (July 2 and 3) to verify priorities in the 3 year plan of INFN.

Official talk on program with accelerators (HEP) given by F. Forti on SuperB.

SuperB is priority #1 of INFN


Funding situation in Italy for R&D is reasonable and coming from different sources.


CERN STRATEGY

New secretary of European Strategy Group has been appointed

Steinar Stepness from Norway.

R. Petronzio and I will meet him next July 31 to update him on the SuperB project and progress and discuss how SuperB is fitting in the agenda for Cern Council Meetings (September2008, December 2008, March 2009)


Next Steps

• Report from Nakada will be presented at RECFA meeting in Athens (Oct.08)

• KH Meier intends to discuss in the Plenary ECFA in November 28, then give the ECFA recommendation on SuperB to Cern Council.

I expect that we will be asked to make a prsentation in front of Cern Strategy Group in December Council meeting.


Physics requirements for

Marcello A. GiorgiUniversità di Pisa & INFN Pisa

SuperB Mini-MAC Frascati July 16-17,2008

http://www.unipi.it/princ.html


Great achievements from e+e- factories PEPII and KEKB

Flavour Physics was recently in the front line of the stage thanks to the e+ e- factories.

1. 2001 CP violation in B sector from Time dependent analysis

2. 2003 Discovery of new charm particles start a new spectroscopy season with DsJ

3. 2004 Direct CP violation in B sector4. 2006 Limits on MSSM parameters from B

5. 2007 Charm mixing from D0 D0bar decay

6. 2008 b discovery


(Some) Results of B-Factories

New DK state(s) at 2.86GeV/c2

Ds2(2573)+

Spectroscopy of new, unexpected states

No Mixing

D0 – D0 mixing

B setting limits on MSSM parameters

Unitarity Triangle precision measurements

Well beyond the original goals

What in the next decade will e

+ e- factories sa

y about new

physics and contrib

ute as complementary to LHC and LHCb ?


Two frontiers for the exploration of New Physics

Relativistic way Quantum way

LHC


High Luminosity potential

• Flavour precision measurements sensitive to New Physics (NP)– Measure interference effect in known processes – Measure decays: rare or forbidden in Standard Model

• NP effects governed by– New Physics Scale NP( Λ)– Effective coupling C

• Different Intensities (from interactions)• Different Patterns (for instance from simmetries)

NP(Λ) not found at LHC• Look for indirect signals of NP• Link them to explaining NP models• Constrain regions in parameter space with NP() sensitivity up several tens of TeV.

NP(Λ) found at LHC• Determine couplings FV e CPV of NP

• Look for heavier states • Study the flavour structure of NP

Some channels as LFV clear segnals of NP

With 7-10x1010 pair bb, cc, (75-100 ab-1) it is possible


NEEDS for Asymmetric machine (7Gev (e-) + 4 GeV (e+)).

• SuperB with peak luminosity of 1036s-2 cm-2 , integrating 75 ab-1 in 5 years.

Background not exceeding too much the present Babar, thanks to low current, crossing angle and a careful design of the Interaction Region.

• One beam 80% polarized (High Energy).

• Possibility of running asymmetric at Charm threshold.


Studies with realistic Detector– Reuse parts of Babar

BASELINE

OPTION

Lower boost increases the angular acceptance in c.m.s more hermetic detector.


Beam pipe at the interaction region

Optimal choice for I.R. :

Beam pipe radius =1.0 cm

First Vertex Layer L0 at 1.5 cm


B0 decay mode = 0.28

vertical scaling

Maps, striplets

Hybrid pixel

Beam pipe radius 1.5 cm. allows higher sensitivity than in Babar in time dependent analysis, even with a lower energy boost.

Detector tech:

Beampipe 0.424% X0

BaBar

10 m intrinsic detector resolution


Metrology and NP sensitivity in 75 ab-1 scenarioSuperB+Lattice improvementsToday

= ± 0.0028 = ± 0.0024

= 0.163 ± 0.028 = 0.344± 0.016

Improving CKM iscrucial to look for NP


Charm FCNC

Charm mixing and CPB Physics @ Y(4S)

Bs Physics @ Y(5S) Physics

© by Ciuchini


SuperB GOLDEN MODES for different scenarios

X

XX- CKM

X

X

X

X The GOLDEN channel for the given scenario

Not the GOLDEN channel for the given scenario but can show experimentally measurable deviation from SM with ≥ 75 ab-1.

X- CKM


Higgs-mediated NP in MFV at large tan

SuperB -75ab-1

MH~1.2-2.5 TeVfor tan~30-60

tan tan

tan

2ab-1

MH~0.4-0.8 TeVfor tan~30-60

Importance of having very large sample ≥75ab-1

2ab-1 10ab-1

75ab-1

tan

How signal would like with MH=350GeV


Red are LHC+EW constraints+ SuperB

Blue is LHC alone

COMPLEMENTARY: LHC and Flavour with 75 ab-1

IF LHC DISCOVERS SUPERSYMMETRY


SPS4 ruled out by present values of s.

SPS1a is the least favorable for

flavour, but SuperB and only SuperB

can observe 2 deviations in several

observables

MFV : SNOWMASS points


23| |LR

1 10

1

10-1

10-2

(TeV)gluinom

In the red regions the are measured with a

significance >3 away from zero

23| |LR

Arg(23)LR=(44.5± 2.6)o

= (0.026 ± 0.005)

1 TeV

g

sb b s

~

~ ~

New Physics contribution (2-3 families)

LRd

23

MSSM+generic soft SUSY breaking terms

Flavour-changing NP effects in the squark propagator NP scale SUSY mass

flavour-violating coupling


Importance of having very large sample >75ab-1

Im ( 1

3)L

L

Im ( 1

3)L

L

Re (13)LLRe (13)LL

SM SM

Determination of coupling [in this case : (13)LL]

with 10 ab-1 and 75 ab-1


KB

Some comparison: Current 10ab-1 75ab-1

)(,* S

KKKB

Actual limit


Charm

• Charm events at threshold are very clean: pure DD, no additional fragmentation

• High signal/bkg ratio: optimal for decays with neutrinos.• Quantum Coherence: new and alternative CP violation

measurement wrt to (4S). Unique opportunity to measure D0-D0 relative phase.

• Increased statistics is not an advantage running at threshold: cross-section 3x wrt 10GeV but luminosity 10x smaller.

• SuperB lumi at 4 GeV = 1035 cm-2s-1 produces ~109 DD pairs per month of running. (using Cleo-c cross-section measurement [(e+e-D0D0)~3.6 nb ] +[ (e+e-D+D-)~2.8 nb] ~ 6.4 nb)

• Time-dependent measurements at 4 GeV only possible at SuperB to extract Phase .


CP Violation in charm from mixing NOW

SuperB


Time dependent measurements at DD threshold:only possible at SuperB

• Proper time resolution dominated by decay vertex resolution. – Production vertex precisely determined thanks to nm beamspot dimensions

SuperB nominal boost

ct = 0.28 120 m ~ 30m

Average flight distance similar to vertex resolution t~

SuperB lumi at 4 GeV = 1035 cm-2s-1 produces ~109 DD per month


Further improvements if polarized beams.

is also a factory golden measurement LFV

Optimization of BKG rejection is in progress. Pol. Helps also to discriminate models. In some model there is a strong effect on the angular distribution of from signal:

(Complementarity with e


Comparison with Snowmass points on Tau using also Polarization

SuperB with 75 ab-1, evaluation assuming the most conservative scenario about syst. errors

LFV

1÷2

5 disc

SuperKEKB worse by a factor 2.5 and 4.5 in and >5 in


Tau g-2

Start with the expt. with

<1

Make use of all the informations (total x-section,angular distribution, f-b asymmetry. Measure Re and Im parts


END


107 B

R

(

M 1

/2

SuperB

SO(10) MSSM LFV from PMNS

LFV from CKMGoing beyond MFV

SUSY GUT now

SuperB

Recent work :J.K.Parry, H.-H. Zhanghep-ph/0710.5443

Allowed by ms

From Bs phase


CMSSM : e vanish at all SPS pointsMVF-NP extentions : e alos vanish s130is independent.

LFV

2

5 disc


Charm physics at threshold

D decay form factor and decay constant @ 1% Dalitz structure useful for measurement

0.3 ab-1

Rare decays FCNC down to 10-8

Consider that running 4 month at threshold we will collect 1000 times the stat. of CLEO-C~ 10 times of futire BESIII

~1%, exclusive Vub ~ few % syst. error on from Dalitz Model <1o

D mixing

CP Violation in mixing could now addressed

Strong dynamics and CKM measurements

Charm physics using the charm produced at (4S)

Charm Physics

Better studied usingthe high statistics collected at (4S)

@threshold(4GeV)

@th

resh

old(

4GeV

)


Topics Requiring further Study to Establish design-performance feasibility (cont)

– IR design (key issues are achieving low betas, stabilization)• Begin first engineering design considerations to be sure

there are no impediments to achieving very low beta and/or the stability needed for collision of tiny beam spots

– Injection does not pose the most challenging of SuperB design problems. However, the Committee was not presented with a clear set of design choices. A baseline configuration should be picked which is (a) capable of ensuring small enough charge fluctuations per bunch and (b) which can be be matched to the ring acceptance(s)

– Continue making good progress on background simulations



Additional Feedback from Mini-MAC

• RF– The RF and feedbacks require performance much like PEP-

II. However the ring impedances must be halved relative to PEP-II. This requires careful study, and constant attention to the details of the vacuum chamber design. The SuperB team must establish an impedance budget and a conscientious impedance-budget manager

– Determine the fundamental performance requirements of the coupled-bunch feedback systems. Build what is needed and make it robust, with special attention to protection against noise sources


Additional Feedback from Mini-MAC (cont)

• Cloud and Ions– Will require further beam dynamics studies with ECI for

e+ and ions for e-. The SuperB teams should take full advantage of the simulation and experimental work at CERN and CESR

• Polarization– Decide on the the gun and injector baseline choices – The Committee endorses inclusion of Polarization in

the baseline design for the SuperB machine. However, the particle physicists should continue to study the relative importance of the physics gains from polarization, because it could turn out that the inclusion of polarization presents reductions in the peak and/or integral luminosity. The inclusion of polarization is not inexpensive and polarization could become a target if there are ultimately affordability problems


Additional Feedback from Mini-MAC (cont.)

• Tor Vergata Site– Given the current footprint of the machine, the facility fits

comfortably on the site along with SPARX. However there is no room for a major expansion

– Details of integration with the SPARX project will need to be carefully developed to avoid compromising the performance capabilities of either facility

– Plus: The site is close to major infrastructure, namely LNF and the University

– Plus: Its near two major airports. Local food is excellent– The site is crossed by a road: this may be a conflict


Committee Report/Next Meeting

• The Mini-MAC will provide a written report. The goal is to have this completed by the end of August 2008

• The next meeting is anticipated in early 2009


Topics Requiring Further Study to Establish design-performance feasibility

(Not all topics need to be studied with equal depth. Judgment is left up to the SuperB team)

– Beam-beam• further experimental tests of crab waist at DAFNE (to achieve

design goals, or understand limitations)– exploit the DAFNE experiment to benchmark and

validate the simulation – demonstrate that the crab waist improves the

performance• perform strong-strong simulations for SuperB with large

Piwinski angle• Evaluate the effect of tolerances and component errors

– Low emittance generation, tuning, dynamic aperture• need simulations including effects of crab waist, errors and

beam-beam. • Need a table of tolerances • need to optimise dynamic aperture with interaction region

(crab waist...)


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