| Preprint | |
| Report number | arXiv:0709.2806 ; HARP-MEMO-07-001 |
| Title | Momentum scale in the HARP TPC |
| Author(s) |
Catanesi, M.G. (Bari U. ; INFN, Bari) ; Radicioni, E. (Bari U. ; INFN, Bari) ; Edgecock, R. (Rutherford) ; Ellis, Malcolm (Rutherford) ; Soler, F.J.P. (Rutherford) ; Gossling, C. (Dortmund U.) ; Bunyatov, S. (Dubna, JINR) ; Krasnoperov, A. (Dubna, JINR) ; Popov, B. (Dubna, JINR) ; Serdiouk, V. (Dubna, JINR) ; Tereschenko, V. (Dubna, JINR) ; Di Capua, E. (Ferrara U. ; INFN, Ferrara) ; Vidal-Sitjes, G. (Ferrara U. ; INFN, Ferrara) ; Artamonov, A. (CERN) ; Giani, S. (CERN) ; Gilardoni, S. (CERN) ; Gorbunov, P. (CERN) ; Grant, A. (CERN) ; Grossheim, A. (CERN) ; Ivanchenko, V. (CERN) ; Kayis-Topaksu, A. (CERN) ; Panman, J. (CERN) ; Papadopoulos, I. (CERN) ; Tcherniaev, E. (CERN) ; Tsukerman, I. (CERN) ; Veenhof, R. (CERN) ; Wiebusch, C. (CERN) ; Zucchelli, P. (CERN) ; Zucchelli, P. (CERN) ; Blondel, A. (Geneva U.) ; Borghi, S. (Geneva U.) ; Morone, M.C. (Geneva U.) ; Prior, G. (Geneva U.) ; Schroeter, R. (Geneva U.) ; Meurer, C. (Karlsruhe, Forschungszentrum) ; Gastaldi, U. (INFN, Legnaro) ; Mills, G.B. (Los Alamos) ; Graulich, J.S. (Louvain U., Inst. Phys. Nucl.) ; Gregoire, G. (Louvain U., Inst. Phys. Nucl.) ; Bonesini, M. (INFN, Milan Bicocca ; Milan Bicocca U.) ; Ferri, F. (INFN, Milan Bicocca ; Milan Bicocca U.) ; Kirsanov, M. (Moscow, INR) ; Bagulya, A. (Lebedev Inst.) ; Grichine, V. (Lebedev Inst.) ; Polukhina, N. (Lebedev Inst.) ; Palladino, V. (Naples U. ; INFN, Naples) ; Coney, L. (Columbia U.) ; Schmitz, D. (Columbia U.) ; Barr, G. (Oxford U.) ; De Santo, A. (Oxford U.) ; Bobisut, F. (Padua U. ; INFN, Padua) ; Gibin, D. (Padua U. ; INFN, Padua) ; Guglielmi, A. (Padua U. ; INFN, Padua) ; Mezzetto, M. (Padua U. ; INFN, Padua) ; Dumarchez, J. (Paris U., VI-VII) ; Dore, U. (Rome U. ; INFN, Rome) ; Orestano, D. (Rome III U. ; INFN, Rome3) ; Pastore, F. (Rome III U. ; INFN, Rome3) ; Tonazzo, A. (Rome III U. ; INFN, Rome3) ; Tortora, L. (Rome III U. ; INFN, Rome3) ; Booth, C. (Sheffield U.) ; Howlett (Sheffield U.) ; Bogomilov, M. (Sofiya U.) ; Chizhov, M. (Sofiya U.) ; Kolev, D. (Sofiya U.) ; Tsenov, R. (Sofiya U.) ; Piperov, Stefan (Sofiya, Inst. Nucl. Res.) ; Temnikov, P. (Sofiya, Inst. Nucl. Res.) ; Apollonio, M. (Trieste U. ; INFN, Trieste) ; Chimenti, P. (Trieste U. ; INFN, Trieste) ; Giannini, G. (Trieste U. ; INFN, Trieste) ; Burguet-Castell, J. (Valencia U., IFIC ; Valencia U.) ; Cervera-Villanueva, A. (Valencia U., IFIC ; Valencia U.) ; Gomez-Cadenas, J.J. (Valencia U., IFIC ; Valencia U.) ; Martin-Albo, J. (Valencia U., IFIC ; Valencia U.) ; Novella, P. (Valencia U., IFIC ; Valencia U.) ; Sorel, M. (Valencia U., IFIC ; Valencia U.) |
| Affiliation | (CERN) ; (Universita degli Studie Sezione INFN, Bari, Italy) ; (Rutherford Appleton Laboratory, Chilton, Didcot, UK) ; (Institut fur Physik, Universitat Dortmund, Germany) ; (Joint Institute for Nuclear Research, JINR Dubna, Russia) ; (Universita degli Studie Sezione INFN, Ferrara, Italy) ; (Section de Physique, Universite de Geneve, Switzerland) ; (Institut fur Physik, Forschungszentrum Karlsruhe, Germany) ; (Laboratori Nazionali di Legnaro dell'INFN, Legnaro, Italy) ; (Los Alamos National Laboratory, Los Alamos, USA) ; (Institutde Physique Nucleaire, UCL, Louvain-la-Neuve, Belgium) ; (Sezione INFN Milano Bicocca, Universita degli Studi Milano Bicocca, Milano, Italy) ; (Institute for Nuclear Research, Moscow Russia) ; (P. N. Lebedev Institute of Physics (FIAN), Russian Academy of Sciences, Moscow, Russia) ; (Universita "Federico II" e Sezione INFN, Napoli, Italy) ; (Columbia University, New York, USA) ; (Nuclear and Astrophysics Laboratory University of Oxford, UK) ; (Universita degli Studie Sezione INFN, Padova, Italy) ; (LPNHE Universites de Paris VI et VII, Paris, France) ; (Universita La Sapienza"e Sezione INFN Roma I, Roma, Italy) ; (Universita degli Studie Sezione INFN Roma III, Roma, Italy) ; (Dept. of Physics, University of Sheffield, UK) ; (Faculty of Physics, St. Kliment Ohridski University, Sofia, Bulgaria) ; (Institute for Nuclear Research and Nuclear Energy Academy of Sciences, Sofia, Bulgaria) ; (Universita degli Studie Sezione INFN, Trieste, Italy) ; (Instituto de Fisica Corpuscular, IFIC, CSIC and Universidad de Valencia, Spain) |
| Publication | 2007 |
| Imprint | 19 Sep 2007 |
| Number of pages | 23 |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN PS ; HARP PS214 |
| Abstract | Recently a claim was made that the reconstruction of the large angle tracks in the HARP TPC was affected by a momentum bias as large as 15% at 500 MeV/c transverse momentum. In the following we recall the main issues with the momentum measurement in the HARP TPC, and describe the cross-checks made to validate the momentum scale. Proton-proton elastic scattering data off the hydrogen target are used to alibrate the momentum of charged particles with a precision evaluated to be 3.5%. A full description of the time development of the dynamic distortions in the TPC during physics spills is now available together with a correction algorithm. This allows a new cross-check using an enlarged data set made by comparing positive and negative pion elasticscattering data collected with negative polarity of the solenoid magnet. These data confirm the absence of a bias in the sagitta measurement. The dE/dx versus momentum curves are revisited, and shown to provide a confirmation that the HARP momentum calibration is correct. Another advocated method, which uses the timing information provided by RPCs to cross-check the momentum measurement against time of flight, is shown to be less reliable because of the dependence of the RPCs time response on the mass of the traversing particle. Overall this analysis demonstrates that the measurement of momentum in the HARP PC is correct within the published precision. |
| Other source | Inspire |
Registre creat el 2007-09-19, darrera modificació el 2023-03-14
PDF