CHARM2012 experimental summary Stephen Lars Olsen Seoul National University Barrel End-cap

BaBar (Belle) Design report ~1995 Look for DD-mixing it will be a clear sign of New Physics

~2007 ???? SM? BaBar & Belle

LHCb Design report ~2005 But CPV in D-meson decay will be a “smoking gun” for New Physics

~2012 ?????, SM? LHCb & CDF

Smoking gun

Some of the topics covered at Charm2012 Weak decays of charm (u-type) quarks – CPV in charm – DD mixing – rare decays – form-factors – f D & f Ds – …, Open- & hidden-charm spectroscopy – charmonium – XYZ states – open charm baryons (& mesons) – …, Charm as a tool – test NRQCD – probe QGP – measure  G/G contribution to proton’s spin – light hadron spectroscopy – inputs for CPV measurements with B mesons – …,

CPV: a CP (D  K + K - )-a CP (D   +  - ) LHCb Carbone: Used 0.6 fb -1  Expect >3x the data by the end of 2012 run HFAG average: Δa CP dir = (−0.645 ± )% CDF Punzi:

SM or New Physics? See theory summary talk

DD mixing Belle Staric BaBar Neri: _

New HFAG Averages for y CP & A 

Rare Decays Dettori SM Most existing limits are background limited, e.g. LHCb  limit

Now: BaBar: D 0   search  (3770)  D 0 D 0 Simulation Real Data D 0   at BaBar limit level Background    K  etc tags Muramatsu EE Rare decays future Future: double tags At BESIII & SuperB:

Form-factors Cabibbo suppressed BESIII Liu: High quality measurements, even for Cabibbo-suppressed modes

f D s recent history Zupanc

f D s future Zupanc Current techniques (at least for D    ) are statisticls limited & can be applied at future higher luminosity facilities.

Spectroscopy

Below threshold charmonium Problems with mass measurements Properties not well known

New BESIII  c mass measurement Mass C.L.= Interference with non-reson. bkg + 5 other modes PDG 2010 Better agreement with Lattice QCD calculation

22 Bhardwaj Belle New Charmonium State:  2

Charged Z + in    c1 system? BaBar (Gradl)Belle PRD 78, (2008) incoherent destructive interf constr. interf

Charged Z b + states in   ϒ &   h b PHSP M( Υ (2S)π) max M(h b (1P)  + ) B B* b b _ B-B* “molecule” _ B* b b _ B*-B* “molecule” _ 2m B* m B +m B*

Lots of progress on charmed-baryons  c * -  c mass splitting Cheon Good agreement, no surprises 17 established states (much better shape than ordinary baryons)

Charm as a tool

NRQCD vs cross sections 25 LHCb CMS NLO NRQCD NNLO color-singlet e.g. York: prompt  ’ production

NRQCD vs Polarization e.g. CDF Casey:

Charm as a probe of QGP ALICE expt Masera

Nuclear Modification Factors: open charm ALICE expt Masera

Nuclear Modification Factors: hidden bottom CMS expt Hong ϒ (1,2,3S) production Analyses based on 7.28  b data sample; 150  b data will be ready soon

 G/G from charm leptoproduction COMPASS expt Franco Too small to explain spin “deficit”(?) COMPASS expt Franco

Light hadron spectroscopy ?? BESIII Shen

Input for CPV studies with B mesons CLEOc &BESIII Briere

Near future BESIII LHCb (Gersabeck)

Further future BelleII (Schwartz)) Panda (Pelizaeus) SuperB (Purohit))

DD mixing ✔ CP violation ✔ XYZ mesons ✔ …, Experiments are doing fine

Theory, not so hot SM DD mixing = ??? ✗ SM CPV = ??? ✗ Pol. in J/  /  ’ prod ✗ …,

The boat is leaving SS Experiment Joe Theorist

But where are we headed? ?

SM desert??

or ?

or Manchester??

Thank You 감사합니다