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13 S Ciencewatch 15 a Strowatch 17 a Rchive I NTERNATIONAL J OURNAL OF H IGH -E NERGY P HYSICS CERNCOURIER WELCOME V OLUME 5 5 N UMBER 8 O CTOBER 2 0 1 5 CERN Courier – digital edition Welcome to the digital edition of the October 2015 issue of CERN Courier. HERA – the world’s first, and so far only, electron–proton collider – ran at DESY from 1992 to 2007, yielding a fascinating view of the innermost structure of the proton. Now, using their data from HERA, the H1 and ZEUS collaborations have combined forces to produce the most detailed picture yet, which in turn provides valuable input for physics studies at the new high-energy frontier that the LHC is just beginning to explore. At the same time, other collaborations, such as RD51 at CERN, are working on the development of detectors for the upgrade in intensity at the LHC, while others are beginning to think about reaching still higher energies – and the innovative process this will entail. 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. Inside the proton: HERA’s legacy DETECTORS ACCELERATORS EPS-HEP RD51 collaboration Could an inventive stimulates MPGD methodology help to 2015 EDITOR: CHRISTINE SUTTON, CERN development guide innovation? News from the DIGITAL EDITION CREATED BY JESSE KARJALAINEN/IOP PUBLISHING, UK p26 p23 Vienna conference p33 CERNCOURIER www. V OLUME 5 5 N UMBER 8 O CTOBER 2 0 1 5 CERN Courier October 2015 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 January and August. The views expressed are not necessarily those of the CERN management. Editor Christine Sutton V OLUME 5 5 N UMBER 8 O CTOBER 2 0 1 5 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 • Zeroing in on Higgs boson properties • So, farewell then • STAR Advisory board Luis Álvarez-Gaumé, James Gillies, Horst Wenninger tracker snares heavy fl avours• Positrons catch a wave at SLAC • Laboratory correspondents: ALICE in Vienna: from antinuclei to quark–gluon plasma CMS Argonne National Laboratory (US) Tom LeCompte • Brookhaven National Laboratory (US) P Yamin observes simultaneous production of top quarks and Z bosons Cornell University (US) D G Cassel DESY Laboratory (Germany) Till Mundzeck Searches for new phenomena with LHC Run-2 ALICE goes EMFCSC (Italy) Anna Cavallini • • Enrico Fermi Centre (Italy) Guido Piragino forward with the ridge in pPb collisions • LHCb improves trigger Fermi National Accelerator Laboratory (US) Katie Yurkewicz Forschungszentrum Jülich (Germany) Markus Buescher in Run 2 GSI Darmstadt (Germany) I Peter IHEP, Beijing (China) Tongzhou Xu 13 CIENCEWATCH IHEP, Serpukhov (Russia) Yu Ryabov S INFN (Italy) Antonella Varaschin Jefferson Laboratory (US) Steven Corneliussen JINR Dubna (Russia) B Starchenko 15 A STROWATCH KEK National Laboratory (Japan) Saeko Okada Lawrence Berkeley Laboratory (US) Spencer Klein Los Alamos National Laboratory (US) Rajan Gupta 17 A RCHIVE NCSL (US) Ken Kingery Nikhef (Netherlands) Robert Fleischer Novosibirsk Institute (Russia) S Eidelman F EATURES Orsay Laboratory (France) Anne-Marie Lutz PSI Laboratory (Switzerland) P-R Kettle 19 The most precise picture of the proton Saclay Laboratory (France) Elisabeth Locci Science and Technology Facilities Council (UK) Jane Binks H1 and ZEUS release their defi nitive paper on deep-inelastic SLAC National Accelerator Laboratory (US) Farnaz Khadem scattering. TRIUMF Laboratory (Canada) Marcello Pavan Produced for CERN by IOP Publishing Ltd IOP Publishing Ltd, Temple Circus, Temple Way, 23 Inventing our future accelerator Bristol BS1 6HG, UK Could an inventive methodology help to guide the innovate process? Tel +44 (0)117 929 7481 Publisher Susan Curtis 26 RD51 and the rise of micro-pattern gas detectors Production editor Lisa Gibson Technical illustrator Alison Tovey The RD51 collaboration has provided Group advertising manager Chris Thomas Advertisement production Katie Graham important stimulus for growth in the Marketing & Circulation Angela Gage development of MPGDs. Head of B2B & Marketing Jo Allen Art director Andrew Giaquinto 33 Vienna hosts a high-energy particle waltz Advertising A report from the fi rst major summer conference on particle physics. Tel +44 (0)117 930 1026 (for UK/Europe display advertising) or +44 (0)117 930 1164 (for recruitment advertising); E-mail: [email protected]; fax +44 (0)117 930 1178 37 F ACES &P LACES General distribution Courrier Adressage, CERN, 1211 Geneva 23, Switzerland E-mail: [email protected] 43 R ECRUITMENT In certain countries, to request copies or to make address changes, contact: China Jiang Ya'ou, Library, Institute of High Energy Physics, PO Box 918, Beijing 100049, People’s Republic of China E-mail: [email protected] 49 B OOKSHELF Germany Antje Brandes, DESY, Notkestr. 85, 22607 Hamburg, Germany E-mail: [email protected] UK Mark Wells, Science and Technology Facilities Council, Polaris House, North Star 50 V IEWPOINT Avenue, Swindon, Wiltshire SN2 1SZ E-mail: [email protected] US/Canada Published by Cern Courier, 6N246 Willow Drive, St Charles, IL 60175, US. Periodical postage paid in St Charles, IL, US Fax 630 377 1569. E-mail: [email protected] POSTMASTER: send address changes to: Creative Mailing Services, PO Box 1147, St Charles, IL 60174, US Published by European Organization for Nuclear Research, CERN, 1211 Geneva 23, Switzerland I NTERNATIONAL J OURNAL OF H IGH -E NERGY P HYSICS Tel +41 (0) 22 767 61 11. Telefax +41 (0) 22 767 65 55 CERNCOURIER V OLUME 5 5 N UMBER 8 O CTOBER 2 0 1 5 Printed by Warners (Midlands) plc, Bourne, Lincolnshire, UK © 2015 CERN ISSN 0304-288X Inside the proton: HERA – the world’s fi rst and so far only electron–proton collider – HERA’s legacy On the cover : ran at DESY from 1992 to 2007. Using data collected there, the H1 and ZEUS DETECTORS ACCELERATORS EPS-HEP RD51 collaboration Could an inventive collaborations have combined forces to publish the most precise results to date on stimulates MPGD methodology help to 2015 development guide innovation? News from the p26 p23 Vienna conference p33 the innermost structure and behaviour of the proton (p19). (Image credit: DESY.) 3 CERNCOURIER www. V OLUME 5 5 N UMBER 8 O CTOBER 2 0 1 5 CERN Courier October 2015 News CERN Zeroing in on Higgs boson properties Results of the analyses by the individual 1.6 ATLAS and CMS experiments (coloured) and of the combined LHC Run 1 analysis (black). The fi t to the data is 1.4 preliminary performed using coupling modifi cation 1.2 factors ĸV and ĸ F that scale, respectively, the As Run 2 at the LHC gains momentum, a κF electroweak symmetry-breaking-related combined analysis of data sets from Run 1 1.0 coupling to the weak bosons and the by the ATLAS and CMS collaborations Yukawa-related coupling to all fermions, has provided the sharpest picture yet on 0.8 with respect to the Standard Model the Higgs boson properties (ATLAS 2015, prediction.The black star at (ĸ V, ĸ F) = (1, 1) CMS 2015).Three years after the 0.6 ATLAS denotes the Standard Model expectation. In announcement in July 2012 of the discovery SM 68% CL CMS this fi t, the total width is assumed to scale 0.4 best fit of a new boson, the two collaborations are 95% CL ATLAS+CMS with the ĸ values and no allowance is made closing the books on measurements of Higgs 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 for invisible or undetected decay modes. properties by performing a combined Run 1 κV analysis, which includes data collected in from Run 2, this set of combined results from 2011 and 2012 at centre-of-mass energies the Standard Model expectation is measured 7 and 8 TeV collisions in Run 1 will continue of 7 and 8 TeV, respectively. This analysis to be 1.09±0.11, and the combination of the to provide the sharpest picture of the Higgs follows hot on the heels of the combined two experiments leads to an observation boson’s properties for some time to come. measurement of the Higgs boson mass, of the H → τ+τ– decay at the level of about ● mH = 125.09±0.24 GeV, published in May by 5.5σ – the fi rst observation of the direct Further reading ATLAS and CMS (ATLAS and CMS 2015). decay of the Higgs boson to fermions. ATLAS and CMS Collaborations 2015 Phys. Rev. Lett. The new results are the culmination of Thanks to the combined power of the data 114 191803. one and a half years of joint work by the sets from ATLAS and CMS, the analysis ATLAS Collaboration 2015 ATLAS-CONF-2015-044. ATLAS and CMS collaborators involved in yields unprecedented measurements of CMS Collaboration 2015 CMS-HIG-15-002. the activities of the LHC Higgs Combination the properties of the Higgs boson, with a Group. For this combined analysis, some precision that enables the search for physics of the original measurements dating back beyond the Standard Model in possible Sommaire en français to 2013 were updated to account for the deviations of the measurements from the Zoom sur les propriétés du boson de Higgs 5 latest predictions from the Standard Model. model’s predictions. The fi gure shows clearly A comprehensive review of all of the the increased precision obtained when Au revoir 5 experimental systematic and theoretical combining the ATLAS and CMS analyses.
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