The French particle physics community is particularly proud to have been selected to host the 35th ICHEP conference in 2010 in Paris. This conference is the focal point of all our field since more than fifty years and is the reference event where all important results in particle physics cosmology and astroparticles are presented and discussed. This alone sufficed to make this event very important. But in 2010, a coincidence of exceptional events made this conference even more attractive! What is then so special about ICHEP 2010 conference? It was the first ICHEP conference where physics results obtained at the LHC were presented! New results about the elusive Higgs boson, or signals of physics beyond the standard model were therefore expected at this conference! Major discoveries in other domains such as gravitational waves, neutrino telescopes, neutrino oscillations, dark matter or in the flavour sector were also possible, just to name a few.
In addition , 2010 is an important date to shape up the future of our field. Several major projects presented the status of their Conceptual or Engineering Design Reports during the conference. The International Linear Collider (ILC) Global Design Effort team presented the report corresponding to the end of their Technical Design Phase 1. The Compact Linear Collider (CLIC) also reported on its Conceptual Design Report. Other major projects such as Super B factories were also presented. These reports together with LHC physics results will form the basis for key political decisions needed to be taken in the years to come.
In summary, there can be no doubt that Paris was the place to be in summer 2010 for anyone interested in High Energy Physics and we made every effort to make your stay as interesting and enjoyable as possible.
The next ICHEP conference, ICHEP2012, will take place in Australia.
Lunches not provided.
Lunches not provided.
We study the spectroscopy and dominant decays of the bottomonium-like tetraquarks (bound diquarks-antidiquarks), focusing on the lowest lying P-wave [bq][bbar qbar] states Y_[bq] (with q=u,d), having J^PC=1^--. To search for them, we analyse the recent BaBar data obtained during an energy scan of the e+ e- -> b bbar cross section in the range of sqrt(s)=10.54 to 11.20 GeV. We find that these data are consistent with the presence of an additional b bbar state Y_[bq] with a mass of 10.90 GeV and a width of about 30 MeV apart from the Upsilon(5S) and Upsilon(6S) resonances. A closeup of the energy region around the Y_[bq]-mass may resolve this state in terms of the two mass eigenstates, Y_[b,l] and Y_[b,h], with a mass difference, estimated as about 6 MeV. We tentatively identify the state Y_bq from the R_b-scan with the state Y_b(10890) observed by Belle in the process e+e- -> Y_b(10890) -> Upsilon(1S, 2S)pi+ pi- due to their proximity in masses and decay widths. We also analyze the Belle data [K.F. Chen, et al. (Belle Collaboration), Phys. Rev. Lett. 100, 112001 (2008); I.Adachi et al. (Belle Collaboration), arXiv:0808.2445] on the processes e+ e- -> Upsilon(1S) pi+pi-, Upsilon(2S) pi+pi- near the peak of the Upsilon(5S) resonance, which are found to be anomalously large in rates compared to similar dipion transitions between the lower Upsilon resonances. Assuming these final states arise from the production and decays of the J^PC=1^-- state Y_b(10890), which we interpret as a bound (diquark-antidiquark) tetraquark state [bq][bbar qbar], a dynamical model for the decays Y_b -> Upsilon(1S) pi+pi-, Upsilon(2S) pi+pi- is presented. Depending on the phase space, these decays receive significant contributions from the scalar 0^++ states, f_0(600) and f_0(980), and from the 2^++ qqbar-meson f_2(1270). Our model provides excellent fits for the decay distributions, supporting Y_b as a tetraquark state.