Transcript The SuperB Detector Confronts New Physics

SuperB
US/Canada Meeting
Introduction
David Hitlin
July 25, 2008
David Hitlin
US/Canada SuperB Meeting
July 25, 2008
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Introduction
 Why we are here ?
 The SuperB project is gaining momentum, particularly within
DOE, after a renewed emphasis on flavor physics by P5
 Organizing the US (Canadian) physics community is obviously a
crucial element in moving forward with DOE/NSF/(NSERC)
 We hope today to take some strides in this direction
 The program
 Introduction - David Hitlin
 INFN Status – Marcello Giorgi
 The SuperB Collider – John Seeman
 The US SuperB Project – David Leith
 Discussion
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US/Canada SuperB Meeting
July 25, 2008
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Progress
 [Marcello will fill us in on progress in Italy and the rest of Europe]
 The recent P5 report recommends, in Scenario B and above,
US participation in an overseas Super B factory
 There are two proposals on the market
1. SuperKEKB, an upgrade of KEKB, with an initial luminosity of 1-2 x 1035
and an upgrade path to 4-8 x 1035 by 2027, using 83 MW
2. SuperB, a new low emittance collider, with an initial luminosity of 1036
using 17 MW, and an upgrade path to 4 x 1036, to be built at
Rome II University “Tor Vergata”, using many PEP-II components
 If you’re interested in 1), you’re in the wrong meeting
 US participation in SuperB would leverage $270M of PEP-II and
BABAR
components through an in-kind contribution
 New funding of $10-20M/year over the TDR and construction period would
also be needed to allow US participation in design and construction of the
collider and detector upgrade
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US/Canada SuperB Meeting
July 25, 2008
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David Hitlin
US/Canada SuperB Meeting
July 25, 2008
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David Hitlin
US/Canada SuperB Meeting
July 25, 2008
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The North American flavor physics community
 The current
BABAR author list has 34 US and 3 Canadian institutions
[henceforth rendered as 34(3)]
 There is also, potentially, interest from the CLEOc, BES, CDF.D0,……..
flavor communities
 Many institutions have, of course, made other commitments at LHC, T2K, etc.
 The size of the overall SuperB collaboration is bound to be smaller than that of
BABAR, perhaps approximating the size of Belle
 The SuperB CDR had 65(5) signers from 12(3) institutions, including SLAC
 A letter we sent to Steve Kahn and David MacFarlane in October, 2007
urging that SuperB be a component of the SLAC PPA program going forward
had 24(6) PI signers from 18(4) institutions, not including SLAC
 It is difficult to project asymptotic numbers, but for the US, 100-150
faculty, postdocs and students seems like an achievable goal
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US/Canada SuperB Meeting
July 25, 2008
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Primary physics objectives of a Super Flavor Factory
The crucial role that flavor physics will play in understanding New Physics found at the
LHC is becoming ever more clear to the community (P5)

Sensitivity to New Physics at scales accessible to the LHC requires 50-75 ab-1
which can be provided by a collider with a luminosity of 1036 in ~5 years

A polarized electron beam adds important and unique capability

SuperB can perform measurements in the quark and lepton flavor sector
such that:

If new particles are discovered at LHC we are able to study the
flavor structure of the New Physics

If the New Physics scale is beyond the reach of the LHC,
SuperB can still explore the New Physics scale
More specifically

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


Is there charged lepton flavour violation (LFV) ?
Are there new CP-violating phases in b,c or t decay ?
Are there new right-handed currents ?
Are there new loop contributions to flavor-changing neutral currents
Are there new Higgs fields ?
Is there new flavor symmetry that elucidates the CKM hierarchy ?
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US/Canada SuperB Meeting
July 25, 2008
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B Physics: U(4S)
Charm mixing and CPV
Charm FCNC
Bs Physics: U(5S)
t Physics
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US/Canada SuperB Meeting
July 25, 2008
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LFV in t decays: SuperB capability
SuperB sensitivity directly confronts many New Physics models
BABAR
SuperB
sensitivity
For 75 ab-1
We expect to see LFV events, not just improve limits
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US/Canada SuperB Meeting
July 25, 2008
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A Super Flavor Factory is also a t factory
Lepton Flavor Violation
polarized e- beam: reduced background
Very important order of magnitude:
10-8  10-9
Complimentarity to m  e g
n.b.: in neutrinos, the mixing is 2<->3
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US/Canada SuperB Meeting
July 25, 2008
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Polarized t’s can probe the chiral structure of LFV
t
t
tt -¬¬-¬--
t -¬¬
t
tt -¬-


Flipping the helicity of the polarized
electron beam allows us to
determine the chiral structure
of dimension 6 four fermion
lepton flavor-violating interactions
-t
t
t ¬¬

Dassinger, Feldmann, Mannel, and Turczyk
JHEP 0710:039,2007;
[See also Matsuzaki and Sanda
arXiv:0711.0792 [hep-ph]
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US/Canada SuperB Meeting
July 25, 2008
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Im
Determination of coupling [in this case : (dLL)13]
SM
Im (d13)LL
Im
(d13)LL
with 10 ab-1 and 75 ab-1
Re (d13)LL
David Hitlin
US/Canada SuperB Meeting
bL
d 
d
LL 13
d
d
sL
S
M
SM
Re (d13)LL
July 25, 2008
(d13)LL
Example: CPV in loop B decays
Im
(d13)LL
Why do we need a very large sample ~75ab-1 ?
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0
S
M
Interplay between metrology and New Physics sensitivity
SuperB+Lattice improvements
Today
r = 0.163 ± 0.028
h = 0.344± 0.016
r = ± 0.0028
h = ± 0.0024
Improving the precision of Unitarity Triangle measurements,
along with reducing theoretical uncertainties, can provide
evidence for New Physics
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US/Canada SuperB Meeting
July 25, 2008
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
CP asymmetries (T-odd) in B  K  K 
*

 
decays
Bobeth, Hiller and Piranishvili have recently shown that CP violation
beyond the SM can produce large CP asymmetries in the C7,9,10 Wilson
coefficients in B  K *   K     decays.
These can be disentangled in a modelindependent way with an angular
analysis in the low q2 region
Needs a sensitivity analysis
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US/Canada SuperB Meeting
July 25, 2008
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CP Violation in charm
NOW
SuperB
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US/Canada SuperB Meeting
July 25, 2008
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Moving forward
 The proto-Collaboration (a rather small group) has already
produced an impressive CDR
 We now entering the TDR phase
 TDR responsibilities must be worked out in the near future
 These will evolve into project responsibilities over the next
two years or so
 INFN is beginning to provide R&D funding for Italian groups
 Organizational activities have begun in Canada, the UK, and to
some extent in France
 It is a good time for interested US groups need step up to the plate
 In the US there has been to date some activity in PID, EMC, trigger,
computing and physics tools
 On July 9, Hitlin, Jawahery, Leith, MacFarlane and Seeman met with a group
from the DOE Program Office (Crawford, Debenham, Kovar and Nicholson)
 They may see SuperB as an important opportunity for the program
 We were encouraged that if university groups expressed interest to DOE
in SuperB involvement, there would be a favorable response
 NSF response as yet not well understood (NSERC ???)
 INFN has formally requested the PEP-II/BABAR components
 John Kogut (Dr. Electron) will shortly be making a presentation to
SC-1 regarding Super B Factories
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US/Canada SuperB Meeting
July 25, 2008
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How do we proceed?
 Raise your hands
 Seminars
 A classic method of spreading the word is seminars and colloquia at
prospective collaborator’s home institutions
 We need to develop a cadre of potential speakers to respond to requests
 We need some requests
 Get involved in the ongoing SuperB meetings
 Speak to your funding agency monitor
 Flavor physics is no longer a taboo subject at DOE; they are likely to respond
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US/Canada SuperB Meeting
July 25, 2008
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David Hitlin
US/Canada SuperB Meeting
July 25, 2008
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SuperB One Pager
 SuperB is a Super Flavor Factory with very high initial luminosity,
1036, which can be upgraded to 4x1036 in a straightforward manner
 It is asymmetric : 4 on 7 GeV
 Most of the ring magnets can be reused from PEP-II, as can the RF systems,
many vacuum components, linac and injection components – as well as BABAR as the
basis for an upgraded detector – the net in-kind value is $270M
 The high energy beam can be linearly polarized to ~85% , using the SLC laser gun
 This is particularly important for confronting New Physics in t decays
 The primary ECM will be the U(4S), but SuperB can run elsewhere in the U region,
and in the charm &tau threshold regions as well, with a luminosity above 1035
 One month at the (3770), for example, yields 10x the total data sample that
will be produced by BEPCII
 SuperB will be built on the campus of the Rome II University at Tor Vergata
 There is an FEL already in the early stages of construction on the site
 Tunneling will continue to dig the SuperB tunnel, funded by Regione Lazio
 Time scales
 (Successful) conclusion of the European Roadmap process (INFN, ECFA,
CERN Strategy Group) by early 2009, followed by INFNMinistry
 TDR effort is beginning: construction 5 years : luminosity in 2015-16
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US/Canada SuperB Meeting
July 25, 2008
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