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New physics & exotic hadron searches @. BESIII. SuperBelle. &. S. L. Olsen . BEPCII & SuperKEKB. ARES RF(LER ). ARES RF(HER ). L=2x10 35 cm -2 s -1 (2012) 8x10 35 cm -2 s -1 (2017). SuperKEKB & BEPCII each provide 10x luminosity increases over the current state-of-the-art. - PowerPoint PPT Presentation


  • New physics & exotic hadron searches @S. L. Olsen BESIIISuperBelle&

  • BEPCII & SuperKEKBL=2x1035cm-2s-1 (2012) 8x1035cm-2s-1 (2017)ARES RF(LER)ARES RF(HER)

  • 2010SuperKEKBBEPCIICLEO-cSuperKEKB & BEPCII eachprovide 10x luminosity increasesover the current state-of-the-art

  • BESIII & Super Belle1 T SC solenoid: sp/p ~ 0.5% @ p~1GeV

    p/K separation up to 1.2 GeV

    CsI (~90% x 4p) sm(p0gg) ~4 MeV

    Muon detection ~80% x 4p pm>0.5 GeVSi strip/pixel vertex detector sz~70mm

    1.5 T SC solenoid: sp/p ~ 0.3% @ p~1GeV

    p/K separation up to ~4 GeV

    CsI (~90% x 4p) sm(p0gg) ~4 MeV

    Muon detection ~80% x 4p pm>0.5 GeVBoth are modern, state-of-the-art detectors

  • Physics at BESIII & SuperBelleNew physics searchesTests of SM predictions for processes with heavy virtual particles

    Search for decays that are forbidden in SM tmg J/ym+e-Exotic hadron physicsXYZ particles

    ucucccH+?+Squarks?+Winos?tetraquarks?quark-gluon hybrids?

  • New Physics SearchesNeed SM processes that: involve massive virtual particles where SM prediction is precise and reliableCP-violating phasesF-B asymmetry in BK*l+l-0- meson: P+l+n decaysCP violation in the c-quark sector

  • CP-violating phases(SM predictions for CPV phases are uneffected by QCD Corrections & are, in principle at least, robust.)

  • SM: CP violation phase is all in the CKM flavor-mixing matrixCPV phases are in the corners

    f3f1 tdW+bVubW+u*Vtd

  • B0

    f1: Interfere BfCP with BBJ/yKStdtdB0Vtb

    V*VcbKSJ/yJ/yKSV*2VtbV*tdtdVcbB0B0+sin2f1Vcb has no KM phaseVtd has a KM phase f1

  • principle of f1 measurementFlavor-tag decay(B0 or B0 ?)J/KSeemore B tagsmore B tagszt=0sin21This is for CP=-1; for CP=+1, the asymmetry is oppositeentangled BB_

  • B-Factory results sin2f1= 0.671 0.024 Belle + BaBar (2008) f1 = 21.1o 0.9o well measured!

  • Role of phases in the CKM flavor-mixing matrix was recognized by the Nobel FoundationA single irreducible phase in the weak interaction matrix can accounts for the CPViolations that are observed in kaon and B decays.

  • Peggy Lee(American singer 1920-2002)

  • Next: CPV in penguin decays, h, K+K-,

  • Why penguins?

  • New physics penguins can modify SM predictionsSMCharged HiggsSuperSymmetryNot all penguins are alike!16

  • sin2f1 with SM bs penguinsVts: no KM phaseSM: sin2f1 = sin2f1 from BJ/y K0 Any difference non-SM particles in the looppenguinVtdVtd+f1BB, h, K+K-f1, h, K+K-**

  • Dalitz plot analysis of BKSK+K- Strong fK+K- peak in M(K+K-) dist but that is not allM2 (K-KS)M2 (K+KS)B0Needs a model for B0KSK+K- decays& a full. t-dependent Dalitz analysistime-dependent!

  • ( KS)1(f0(980) KS)1SM resultRoom for ~10x improvement Super Belle/KEKB

  • Electro-weak penguins: BK* l+l-no gluons here(so SM predictionsfor the lepton sectorare robust & reliable)K*B

  • Ali, Mannel, Morozumi, PLB273, 505 (1991)AFB(BK*l+l-)(q2)SM predn for AFB is not sensitive to (poorly known) QCD correctionsFBNF-NBNF+NB=

  • Hints of an anomaly?BABAR, arXiv:0804.4412Belle, PRL 96, 251801386M384M657MBelle PreliminaryData points are all above the SM(Ml+l-2 dist & branching fractions ~agree with SM expectations.)Belle Published

  • 0- meson pure leptonic decays: P+ l+nAll inputs well measured except fP, which can be computed by LQCDB+ (or D+ or Ds)+QqSM prediction (W+ only):23

  • Latest B-factory resultPreliminary(arXiv: 0809.3834, BELLE-CONF-0840)Semileptonic B tags only (BD*l )3.8 signal significance Measurement above SM expectation, discrepancy ~1.4-2 (CKMfitter 2008 prediction) SM:

  • Belle limits on charged HiggsRuled out (95% CL) by Bf(BXsg)Ruled out by Bf(B+t+n)

  • (Almost) all of CMS accessible range for an MSSM H+ is already ruled outRuled out by BelleAccessible at LHCRegionLeftForLHC

  • D+(Ds+)l+n at BESIIICLEO-c signals:D+m+nDs+t+nLQCD preds (~2% precision)Clean exptl signals. BESIIIcan achieve high precision.3s SM-Expt discrepancy for fDs;statistical errors dominate

  • CPV in D meson decays at BESIIINo KM phases in cs or cdAny CPV seen in D meson decay would indicate new physics

    To observe CP-viol. you need both a CPV phase & a non-zero strong phasec.f. D K+K-p has lots of resonances with large strong phasesOpposite sign formatter-antimatterSame sign formatter-antimatter No SM CPV phases here

  • D K+K-pDK*KfpKKp model strong phases

  • Fit for D+ D- differencesCLEOc , with 818 pb-1 at the yarXiv 0807.4545ACP = (-0.03 0.84 0.29)%BESIII will have >20x more dataM+ - M-30

  • Summary (New Physics)Super Belle & BESIII have unique opportunities to search for New PhysicsReaches beyond the LHC for some scenarios Room for a factor ~10 improvement in precision before SM limitations are reached.Tantalizing hints of new phenomena show up in B-factory & CLEO-c data.Dalitz analyses becoming increasingly important

  • CommentNew Physics Searches are prime motivators for Super-Belle & BESIIIpays the bills

    New discoveries will belong to the host laboratories & the exptl teams in entirety SNU included

    SNU group needs signature topics & expertiseDalitz analyses?exotic hadrons?

  • Exotic hadrons atBESIII & SuperBelle

  • Motivation for exotic hadronsPerkins textbook, Introduction to High Energy Physics, pg.118The states observed in nature consist of three-quark combinations (the baryons) and quark-antiquark combinations (the mesons).Particle Physics TextbooksucucccBut QCD suggests that tetraquarks and quark-gluon hybrids also occur.

  • How to find an exotic hadronFind a hadron with quantum numbers that cant be produced by qqq or qq combosPentaquark: S=+1 baryon Q+=

    Charged or strange charmonium: e.g. Z+=

    Find cc or bb mesons that dont fit into an unassigned qq quarkonium level. sduduucdc___

  • Charmonium meson spectrum predicted measuredOnly a few charmonium levels are still available36

  • Neutral X & Y mesons BaBarBK p+p-J/yM(p+p-J/y)-M(J/y)X(3872)M(wJ/y)Y(3940)X(3940)X(4160)e+e-DD*J/ye+e-D*D*J/yM(DD*)M(D*D*)Y(4260)BelleBelleBelleY(4008)?e+e-gISRp+p-J/yY(4350) & Y(4660) e+e-gISRp+p-yM(p+p-J/y)M(p+p-y) e+e-gISRLcLcM(LcLc)M(wJ/y)BaBarBaBarBelleBelleBelleBelleyX(3872)(Decay to finalstates with a ccpair & Sqi=0 )JPC=1++JPC=1--???BK wJ/yBK wJ/y37

  • No obvious available cc assignments for these states3872MeV Only one unfilled 1++ level Mass is too low for the X(3872) cc1ppJ/y violates IspinBf(X3872ppJ/y)>4% G(gJ/y) should be >>G(rJ/y)expt: G(gJ/y)
  • Are there similar states with:scdcucdcZ+Zs0non-zero charge?

    non-zero strangess?

    non-zero charge & strangeness?ucscZs+smoking guns for non qq meson states

  • The Z(4430)+(py) meson candidateM(py) GeVBK p+yZ(4430)M2(py) GeV2M2(Kp) GeV2S.-K. Choi et al (Belle) PRl 100, 142001 Veto

  • Could this be a reflectionfrom the Kp channel?

  • Cos qp vs M2(py) 16 GeV222 GeV2M2(py)+1.0-1.0cosqpM (py) & cosqp are tightly correlated;a peak in cosqp peak in M(py)(4.43)2GeV20.25ypKqp

  • Can interference between Kp partial waves produce a peak?Only S-, P- and D-waves seen in datainterfereAdd incoherently

  • Can we make a peak at cosqp0.25with only S-, P- & D-waves?

  • Can we make a peak at cosqp0.25with only S-, P- & D-waves?

  • Can we make a peak at cosqp0.25with only S-, P- & D-waves?Not without introducing other, even more dramatic features at other cosqp (&,, other Mpy) values.

  • BaBar doesnt see the Z(4430)+Belle: = ( GeV2

  • C. Hearty @ SLACs B-factory Symposium

  • BKpy Dalitz-plot analysesBKZ+K2*yK*yKpyDefault Model

  • Results Toy MC: fit CL=36%112323454A5BACBC

  • Results with no Z(4430) term Toy MC: fit CL=0.1% 1234512345ABCABC51

  • Dalitz analysis resultsSignif: 6.5sPublished resultsMass & significance similar,width & errors are largerWith Z(4430)WithoutZ(4430)Belle: = (3.2+1.8+9.6 )x10-5 0.9-1.6BaBar: No contradiction

  • Candidates for exotic mesons in the s-quark sectorAccessible at BESIII

  • J/y g ppThis is the hc,ppthe J/ysspin=0 partnerWhat is this???M(pp) GeV

  • Fit the M(pp) distributionBest fit to this peakis a resonance withpeak mass below thepp mass thresholdM=1835 MeV no knowG 100MeV resonance

  • Actual fitM=1830.6 6.7 MeV/c2

    G < 153 MeV/c2 (90% CL)J/ygpp in the BES expt00.10.20.3c2/dof=56/56fitted peak location

  • A pp bound state (baryonium)?pnppdeuteron:loosely bound 3-q 3-q color singlets with Md = 2mp- ebaryonium:loosely bound 3-q 3-q color singlets with Mb = 2mp-d ?attractive nuclear forceattractive force?There is lots & lots of literature about this possibility

  • Expectation for pp bound state mesonmp +mpAbove thresholdXpp ~100% below-threshold p and p annihilate tomesonsI=0, JPC=0-+ init. state:pp p+p-h is common(h = mostly ss)

  • Look in J/y g p+p-h M(p+p-h) M=1833 MeVG 70MeV mp+mpBESII

  • X(1835)pph @ BESIII M() GeV/c2 2.5 days @ BES-IIIM() GeV/c22 yrs @ BESIIM() GeV/c2X(1835)X(1835)

  • J/y h f f0(980) @ BESIIY(2175)?????By next summer, BESIII should have 300M J/y decays&, eventually 10,000M J/Y decays(with 58M J/y decays)A much better detectorf = ~100% ss

  • Proposed WCU research @ BESIII & (Super)Belle Continue collaborati