I NTERNATIONAL J OURNAL OF H IGH -E NERGY P HYSICS CERNCOURIER WELCOME V OLUME 5 4 N UMBER 4 M AY 2 0 1 4 CERN Courier – digital edition Welcome to the digital edition of the May 2014 issue of CERN Courier. News that the BICEP2 telescope has found evidence for an era of cosmic inflation, just after the Big Bang, sent ripples deep into the particle-physics community, where research looks closely into the nature of fundamental forces and particles in the early universe. News on these particles continues to flow from analyses of high-energy data from the LHC’s first run, as well as from Fermilab’s Tevatron. At the same time, analyses of low-energy data are turning up surprises, with indications of four-quark states, for example at the BESIII experiment in Beijing. Meanwhile, there was much sadness at CERN at the passing of the last of the founding fathers, diplomat François de Rose, whose vision for the organization remains just as compelling 60 years on. To sign up to the new-issue alert, please visit: http://cerncourier.com/cws/sign-up. To subscribe to the magazine, the e-mail new-issue alert, please visit: http://cerncourier.com/cws/how-to-subscribe. Cosmic infl ation: the view from BICEP2 BESIII TRIBUTE PARTNER(S) Precision studies CERN loses its last home in on the founding father, FOR LIFE EDITOR: CHRISTINE SUTTON, CERN XYZ particles François de Rose A training project DIGITAL EDITION CREATED BY JESSE KARJALAINEN/IOP PUBLISHING, UK p17 p24 for hadron therapy p21 CERNCOURIER www. V OLUME 5 4 N UMBER 4 M AY 2 0 1 4 CERN Courier May 2014 TURBOVAC i Contents Covering current developments in high-energy physics and related fi elds worldwide CERN Courier is distributed to member-state governments, institutes and laboratories affi liated with CERN, and to their personnel. It is published monthly, except for CERNCOURIER Turbomolecular pumps January and August. The views expressed are not necessarily those of the CERN management. Editor Christine Sutton V OLUME 5 4 N UMBER 4 M AY 2 0 1 4 News editor Kate Kahle CERN, 1211 Geneva 23, Switzerland E-mail [email protected] Fax +41 (0) 22 785 0247 5 N EWS Web cerncourier.com • LHC and Tevatron teams announce fi rst joint result• CERN Advisory board Luis Álvarez-Gaumé, James Gillies, Horst Wenninger and ESA sign co-operation agreement • CMS sets new constraints Laboratory correspondents: on the width of the Higgs boson LHCb’s results become more Argonne National Laboratory (US) Cosmas Zachos • Brookhaven National Laboratory (US) P Yamin precise ATLAS uses t → qH decays to pin down the Higgs Cornell University (US) D G Cassel • • DESY Laboratory (Germany) Till Mundzeck LHCf investigates proton–lead collisions OPERA sees a fourth EMFCSC (Italy) Anna Cavallini • Enrico Fermi Centre (Italy) Guido Piragino τ neutrino Fermi National Accelerator Laboratory (US) Katie Yurkewicz Forschungszentrum Jülich (Germany) Markus Buescher GSI Darmstadt (Germany) I Peter 11 S CIENCEWATCH IHEP, Beijing (China) Tongzhou Xu IHEP, Serpukhov (Russia) Yu Ryabov INFN (Italy) Romeo Bassoli 13 A STROWATCH Jefferson Laboratory (US) Steven Corneliussen JINR Dubna (Russia) B Starchenko KEK National Laboratory (Japan) Nobukazu Toge 15 A RCHIVE Lawrence Berkeley Laboratory (US) Spencer Klein Los Alamos National Laboratory (US) Rajan Gupta NCSL (US) Ken Kingery F EATURES Nikhef (Netherlands) Robert Fleischer Novosibirsk Institute (Russia) S Eidelman 17 BESIII and the XYZ mystery Orsay Laboratory (France) Anne-Marie Lutz PSI Laboratory (Switzerland) P-R Kettle Results from precision studies in the charm energy region. Saclay Laboratory (France) Elisabeth Locci Science and Technology Facilities Council (UK) Julia Maddock SLAC National Accelerator Laboratory (US) Farnaz Khadem 21 A network for life Marcello Pavan TRIUMF Laboratory (Canada) PARTNER – an innovative training project in the fi eld of hadron Produced for CERN by IOP Publishing Ltd IOP Publishing Ltd, Temple Circus, Temple Way, therapy. Bristol BS1 6HG, UK Tel +44 (0)117 929 7481 24 François de Rose: strategist and visionary Publisher Susan Curtis ©BICOM_12152.01 0.02.2014 The last of CERN’s founding fathers, a loyal Production editor Lisa Gibson Technical illustrator Alison Tovey supporter and a dear friend, passed away at Group advertising manager Chris Thomas Advertisement production Katie Graham age 103. Marketing & Circulation Angela Gage Head of B2B & Marketing Jo Allen Art director Andrew Giaquinto 27 The World Wide Web’s 25th anniversary Advertising Time to ensure that the web remains open, free and accessible. Tel +44 (0)117 930 1026 (for UK/Europe display advertising) or +44 (0)117 930 1164 (for recruitment advertising); A giant leap in vacuum performance! E-mail: [email protected]; fax +44 (0)117 930 1178 31 F ACES &P LACES General distribution Courrier Adressage, CERN, 1211 Geneva 23, Switzerland E-mail: [email protected] 38 R ECRUITMENT In certain countries, to request copies or to make address changes, contact: It has never been easier to improve your processes than today! 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This new product line is supplemented by the most flexible St Charles, IL 60175, US. Periodical postage paid in St Charles, IL, US Fax 630 377 1569. E-mail: [email protected] multi-inlet turbomolecular pumps TURBOVAC 350 - 400 i MI. Intended for the POSTMASTER: send address changes to: Creative Mailing Services, PO Box 1147, The TURBOVAC i series 350 i, St Charles, IL 60174, US I NTERNATIONAL J OURNAL OF H IGH -E NERGY P HYSICS requirements of analytical instruments, multi-inlet pumps are prepared for 450 i and 350-400 i MI at a glance CERNCOURIER Published by European Organization for Nuclear Research, CERN, V OLUME 5 4 N UMBER 4 M AY 2 0 1 4 1211 Geneva 23, Switzerland individual design customization to provide an optimum process adaptation. Tel +41 (0) 22 767 61 11. Telefax +41 (0) 22 767 65 55 Oerlikon Leybold Vacuum GmbH Printed by Warners (Midlands) plc, Bourne, Lincolnshire, UK Bonner Straße 498 © 2014 CERN ISSN 0304-288X D-50968 Köln Cosmic infl ation: The sun sets behind BICEP2 (in the foreground) and the South Pole the view from BICEP2 On the cover : T +49 (0)221 347-0 Telescope (in the background). In measuring the cosmic background radiation, the BESIII TRIBUTE PARTNER(S) F +49 (0)221 347-1250 Precision studies CERN loses its last BICEP2 experiment has found evidence for cosmic infl ation (p13). (Image credit: home in on the founding father, FOR LIFE XYZ particles François de Rose A training project [email protected] p17 p24 for hadron therapy p21 Steffen Richter, Harvard University.) www.oerlikon.com/leyboldvacuum 3 Anz_TMPi_CERN_EN_2014.indd 1 30.01.14 17:32 CERNCOURIER www. V OLUME 5 4 N UMBER 4 M AY 2 0 1 4 CERN Courier May 2014 cividec News Instrumentation CIVIDEC Instrumentation is a R&D company born from the cutting-edge technology of CERN. We specialise in turn-key T OP PHYSICS solutions for beam diagnostics based on CVD diamond technology. LHC and Tevatron teams announce fi rst joint result The collaborations working on the world’s Top quark mass measurements of researchers, and a detailed understanding leading particle-collider experiments have ATLAS of each other’s techniques and uncertainties. joined forces, combined their data and Each experiment measured the mass of the Diamond Detectors produced the fi rst joint result from Fermilab’s CDF top quark using several different methods. Tevatron collider and CERN’s Large Hadron The analyses involved a variety of top-quark CMS Collider. Scientists from the four experiments decay channels, employing sophisticated involved – ATLAS, CDF, CMS and D0 – DZERO techniques that have been developed announced their joint fi ndings on the mass and improved over more than 20 years 2 combined result 173.34 ± 0.76 GeV/c of the top quark at the 2014 Rencontres de March 2014 of top-quark research, beginning at the Moriond international physics conference Tevatron and continuing at the LHC. on 19 March. The four collaborations pooled More than 6000 researchers from more 165 170 175 180 their data-analysis power to arrive at a world’s mass (in units of GeV/c2) than 50 countries participated in the four best value for the mass of the top quark of experimental collaborations. 173.34±0.76 GeV/c2. The four individual top-quark mass Experiments at the LHC and the Tevatron measurements by the ATLAS, CDF, CMS ● Further reading collider are the only ones that have observed and D0 collaborations, together with the The ATLAS, CDF, CMS and D0 collaborations the top quark – the heaviest-known joint and most precise measurement. (Image 2014 arXiv:1403.4427 [hep-ex]. elementary particle.