[Contribution to the "uncovered analyses" catalog from Claudia Patrignani, from the Charmonium AWG] Dear Denis and others, Sorry for the delay... Here is my addition to the list of items mostly in Upsilon and Psi (or simil-psi) spectroscopy with possible "spin-offs". (some ideas can be crazy, in some cases feasibility must be checked) Sorry if the message is long. To my knowlege only the analyses listed under 1a and 1b.1-1b.2 are covered, but I list them because they can share techniques with similar analyses. Some of these are probably not fully under the Charmonium "jurisdicion", but are more general possible babar measurements on heavy quarkonia. Since Gautier and Stephen are the only ones currently interested in similar analysis I'm asking their opinion too on "extensions" to their favourite analysis topic (that's why I'm not posting it on HN, not yet at least) It's up to you to see which (if any) is sensible to label officially as "free" If I had to rank those measurements based on both possible impact and chances of beeing feasible, my best "bet" would be to provide measurement for BOTH 1b.2 (that is covered) AND 1c that nobody's taking care of (but is probably more IHPS AWG) 1b.4 would certainly be interesting and might be feasible (that one could be charmonium AWG) 2a and 2b would certainly each lead to a decently meaningful paper (but they are TauQED) 2c is challenging but... The impact of others is obviously depending on the outcome. Here's my list 1) Upsilon(nS) in ISR (and other bottomonia from upsilon cascades): Relatively new topic in babar, only partially explored, likely has lot more to give Large overlap with IHPS AWG, I intend to work on that subject, Stephen Sekula has also started (see ref [3]) an analysis on visible/invisible BRs in tagged Upsilon (from ISR Upsilon(nS) -> pipi X) that could lead straight forward to measurement of leptonic BR of Upsilon but in both cases there can be many more analyses that could be done Planned/started analyses whose analysis strategy could be adopted for further measurements 1a) (myself) Inclusive searches for bottomonium states decaying to Upsilon +pions Upsilon pi+pi- Upsilon pi+pi-pi0 (+eta,omega..) Upsilon gamma Upsilon gamma gamma (+eta, pi0) only Upsilon pi+ pi- started, And I would love to have help on other channels...! Analysis strategy: Reconstruct the 1S or 2S in mu+mu- (e+e-) plus the others, bump hunting in invariant mass... Phys. Motivations: -Measure Upsilon(4S)->Upsilon(') pi+pi- (first non bbbar decay observed, absolute value and ratio of BR to pi+pi-Ups(1S)/pi+pi-Ups(2S) depend on wave function overlap integral -measure dipion invarian mass distribution for all dipion transitions among vector states (puzzling differences wrt prediction) -Measure G_ee *B(Ups'->pi+pi- Ups)*B(Ups->e+e-) -Possibly measure B_ee/B_mumu at 1S and 2S -Some (so far undetected) states are predicted to decay to Upsilon X. Chi_b to omega Upsilon have been seen exclusively in the full cascade -Search for further Upsilon(4S) bottomonium decays. No skim available but efficient filter on event tag info: can run on all data in ~2 weeks 1b) [Stephen Sekula] Direct measurement of Upsilon(2S) or Upsilon(1S) exclusive branching ratios Analysis strategy: Tag and count Upsilon(1-2S) production in the gamma pi+pi- missing mass spectrum of e+e- -> gamma Upsilon(2-3S)-> pi+pi- X (my rough, not MC,nor Stephen's estimate) of Ntag samples with detected ISR photon Upsilon(3S)-> pipi X 15-25K 1S and 4-10K 2S (softer pions lower eff) Upsilon(2S)-> pipi X 30-45K 1S It might be possible to accept events without ISR photon by kinematically constraining the undetected ISR photon to costh=+-1 gaining 5-7 times in Ntag but it remains to be seen if the increase in background is tolerable For Skims/ filtering ask Stephen Publishable measurements from Stephen's analysis: 1b.1 From the number of Ntag 1S and 2S Measurement of G_ee*B_pipiUps at both 2S and 3S Phys. motivation: one more constraints on those widths/BR; different products of BR and independent syst from CLEO measurement 1b.2 From number of 1S or 2S in e+e-, mu+mu- or tau+tau- (counting e+ mu- X) in the recoil, direct measurement of e+e-, mu+mu- and tau+tau- BR Physics motivation: New Cleo-III B_mumu [2] is much higher than previous measurements. (Impact on total width) Verify lepton universality (there is some speculation on Higgs/ new physics see e.g [4]) Together with measurement 1c) below 1S and 2S widths precisely determined by "babar only" measurements... Further suggestion for measurements that could be forseen with this strategy but they ought to be investigated 1b.3 (???) Low mutiplicities (3-4) Br to light hadrons AND/OR to charmed hadrons of Upsilons Currently there are just few two body upper limits <10^-4 at the 1S only so Jpsi X or 3-4 body could be feasible with "undetected photon" tag sample 1b.4 (???) Inclusive photon spectrum: that is hot topic for SCET [ e.g ref 7], doing it in tagged Upsilon samples could have the advantage that you have different QED backgrounds and you can study them on sidebands.. "Feasible and surely worth at least one paper" but to my knowledge free in bottomonium land 1c) Measurement of G_ee * B_mumu similarly to what was done with Jpsi by Babar [1] but without detecting the ISR photon, exploiting the fact that the Upsilon is monochromatic, eg. by measuring the event yield in the two dimensional plot M_mumu vs PCM_mumu Roughly estimated expected event yield in Run1-Run4 : 110k *eff for 1S 50K *eff for 2S 130K *eff for 3S (NB: 2S and 3S events could be underestimated by >50% based on new B_mumu measurements from CLEO-III, see ref [2]) If photon is required eff. should be around 5%, without photon around 50% so yields are sizeable Physics motivation: allow to improve total and leptonic widths and allow to determine them without lepton universality assumption in conjunction to other measurement: - Absolute B_ee and B_mumu BR from 1b.2 above: Gee and Gamma "BABAR only" measurement And/or - Scan measuremens determine G_ee *B_hadr - CLEO_III has measured B_mumu/B_hadr Overall this new measurement of G_ee *B_mumu could dramatically improve G_ee and Gamma for the narrow Upsilon resonances Other "free" measurements to my knowledge in charmonium land in two photon (not already mentioned by Gautier) all of them surely leading to a paper 2a) Jpsi gamma in two photon reaction (no skim available, filtering on evenTag info can pass less than 5% AllEvents, so that reskimming might not be a severe issue) Physics Motivation: Absolutely relevant measurement of G_gg B_Jpsi gamma at chi0 it could nail down (in the global PDG-like fit) the error on two photon and Jpsi gamma radiative widths Increase precision on chi2 (measured by Belle on 33 fb) could also improve current estimates for two photon widths and BR of chi2. Estimated event yield: order of 100 chi0->Jpsi gamma, thousand(s) chi2->Jpsi gamma (depending on Pt* cut) (??) Angular analysis could set limit on chi2 helicity 0 amplitude (expected to be small but not zero) 2b) gamma gamma-> ppbar angular distribution vs sqrt(s) could provide information on the onset of perturbative regime (see e.g. ref [6]). May be eta_c could even be seen (expect more than few hundreds events) Upper limit in eta_c(2S) for B(ppbar)*B(gammagamma) could be relevant to the planned PANDA experiment That one is more difficult but it could be given a try... 2c) (???) etac-> gamma gamma (YES, look at events with just two photon in the final state...) With BR 0.4 10^{-3}, i.e. factor ~25 less than KKspi->K3pi, the event yield can be hundreds might be not unreasonable to see: Physics motivation: Determine DIRECTLY two photon width of eta_c, and indirectly constraint (from G_gg*B_KKpi measured by Gautier) B_KKpi, which in turn constraints radiative M1 decays of Jpsi and Psi2S. If feasible major improvement expected on those widths that theorists like so much. The constraint on B_KKpi would be largely independent from that set by Guy & Matteo's measurement, and B factories could measure Psi BRs needed by our CLEO-c colleagues at charm factories More general "high mass stuff" bump hunting might end up in nothing, but could be also big surprises... With SimpleComposition and BtaTupleMaker could be worth to give it a try to see how much backgroud there is and how much time it takes to run 3a) (???) (One more inclusive Jpsi stuff) Invariant mass M(Jpsi K+K-) vs M(K+K-) and M(Jpsi pi+pi-) vs M(pi+pi-) for high P* Jpsi and "large mass" K+K- (pi+pi-) (Jpsitoll Skim) No physics compelling motivation if not that those could be clean channels and that "hidden ccbar ssbar" stuff could favour Jpsi K+K- More difficult bottomonia measurements: 4a) (???) Inclusive two body Phi phi, phi omega, phi eta(') with very large inv. masses (SKIM???) P* cut of phi can effectively reject all B background Motivation: Search for bottomonium states to VV (chi_b eta_b) VP (or who knows...) 4b) (???) Two body hadronic decays we might set better limits (currently order 104, i.e. (two body)(X) and below e+e->two body A reasonable filter on tagbits quantities just could pass 6% of events for analysis, so reskimming might not be a real issue It remains to be seen if we can have low enough background. 4c) (???) Even more difficult: two body K+ K*- and rho0rho0 picking up resonances with high P* to search (inclusively, i.e. without attempt of detecting photons) for eta_b(') that should be copiously (??) produced by the ISR upsilon sample Ref: [1] (Babar Jpsi ISR production) http://arxiv.org/abs/hep-ex/0310027 [2] (CLEO muonic BR of Upsilons) http://arxiv.org/abs/hep-ex/0409027 [3] (Sekula's talks at LBC QWG) http://babar-hn.slac.stanford.edu:5090/HyperNews/get/LeptonicBC/423/2/1.html http://babar-hn.slac.stanford.edu:5090/HyperNews/get/LeptonicBC/432/4.html [4] (lepton universality and new phys) http://arxiv.org/abs/hep-ph/0307313 [5] (Chi2 Jpsi gamma in two phot) http://arxiv.org/abs/hep-ex/0205100 [6] (Two photon barion production) http://arxiv.org/abs/hep-ph/0206288 [7] (inclusive photon spectra in Upsilon) http://it.arxiv.org/abs/hep-ph/0212094