Search for η mesic nuclei in GSI/FAIR
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1 Search for η mesic nuclei in GSI/FAIR Kenta Itahashi Avance Meson Science Laboratory, RIKEN for η-prime collaboration Y. Ayya, J. Benlliure, K.-T. Brinkmann, S. Frierich, H. Fujioka**, H. Geissel, J. Gellanki, C. Guo, E. Gutz, E. Haettner, M. N. Harakeh, R. S. Hayano, Y. Higashi, S. Hirenzaki, C. Hornung, Y. Igarashi, N. Ikeno, K. Itahashi*, M. Iwasaki, D. Jio, N. Kalantar-Nayestanaki, R. Kanungo, R. Knoebel, N. Kurz, V. Metag, I. Mukha, T. Nagae, H. Nagahiro, M. Nanova, T. Nishi,H. J. Ong, S. Pietri, A. Prochazka, C. Raol, M. P. Reiter, J. L. R. Sánchez, C. Scheienberger, H. Simon, B. Sitar, P. Strmen, B. Sun, K. Suzuki, I. Szarka, M. Takechi, Y. K. Tanaka, I. Tanihata, S. Terashima, Y. N. Watanabe, H. Weick, E. Wimann, J. Winfiel, X. Xu, H. Yamakami, J. Zhao *sokeserson, ** co-sokeserson!! for Suer-FRS collaboration Osaka University, Universiae e Santiago e Comostela, Universitaet Giessen, Kyoto University, GSI, University of Groningen, Beihang University, The University of Tokyo, Nara Women's University, KEK, RIKEN, Tokyo Metroolitan University, Saint Mary s University, Technische Universitaet Darmstat, Comenius University Bratislava, Stefan Meyer Institut, Niigata University! Nagahiro, Jio, Fujioka, KI, Hirenzaki, PRC87(13) KI, Fujioka et al., PTP 128 (12)
![η an other PS mesons [MeV/c 2 ] η](/docs-images/94/121880475/images/2-0.jpg "M=958 MeV/c 2 1000 750 η M=548 MeV/c")
2 η an other PS mesons [MeV/c 2 ] η M=958 MeV/c η M=548 MeV/c 2 K M=498 MeV/c M=140 MeV/c 2 RIKEN Nishina Center, Kenta Itahashi 2 0
3 Large η mass can be exlaine UA(1) quantum anomaly χ-symmetry breaking q q 6-oint vertex q q qq time Kobayashi-Maskawa- t Hooft-tye interaction Kobayashi, Maskawa, PTP44(70)1422 t Hooft, PRD14(76)3432. T. Kunihiro, Phys. Lett. B219(89)363. Klimt, Lutz, Vogl, Weise, NPA516(90)429. RIKEN Nishina Center, Kenta Itahashi 3
4 [MeV/c 2 ] In-meium PS mesons Partial restoration of ynamical breaking of χ symmetry η η K NJL moel Nagahiro et al, PRC 74, (2006) ρ/ρ0 Nagahiro et al., PRC 87 (2013) Jio et al., NPA 914 (2013) 354 4
![[MeV/c 2 ] η In-meium PS mesons Partial restoration of ynamical breaking of χ symmetry 1000 NJL moel 750 η K 500 Q.](/docs-images/94/121880475/images/5-3.jpg "Mass shift (of ~ 150 MeV/c 2 ) can be observe in exeriment? 250 0 Nagahiro et al, PRC 74, 045203 (2006) ρ/ρ0 Nagahiro et al.")
5 [MeV/c 2 ] η In-meium PS mesons Partial restoration of ynamical breaking of χ symmetry 1000 NJL moel 750 η K 500 Q. Mass shift (of ~ 150 MeV/c 2 ) can be observe in exeriment? Nagahiro et al, PRC 74, (2006) ρ/ρ0 Nagahiro et al., PRC 87 (2013) Jio et al., NPA 914 (2013) 354 5
6 η Mesic Nuclei in (,) Reaction η transfer reaction + missing mass measurement 12 C 11 C η η 11 C mesic nuclei T = 2.50 GeV q ~ 400 MeV/c KI, Fujioka et al., PTP 128 (12)
7 7 Theoretical Preiction η -nucleus otential: 12 C(,) at T = 2.50 GeV ρ: nucleon ensity V0: Real otential eth W0: Imaginary otential eth Nagahiro et al., PRC87(13)
8 8 Sectrum in Inclusive Measurement at GSI Signal 12 C(,) 11 C η η Nagahiro et al., PRC87(13)
9 9 Sectrum in Inclusive Measurement at GSI Signal 12 C(,) 11 C η η (V, W )= (150, 5) MeV Backgroun counts/2mev multi- BK Simulation Excitation Energy [MeV] KI, Fujioka et al., PTP 128 (12) 601.
10 10 Ste-by-ste aroach Measurement Objectives S/N GSI (,) inclusive extremely goo statistics for overall structure + BK stuy oor GSI/FAIR Day 1 (,) exclusive* extene sensitivity for excite + groun states goo FAIR Day 1 (,x) exclusive* exclusive + ecay moe stuies goo
11 11 Princiles of Exclusive Measurement at GSI/FAIR η η Signal Signals η η Nη Backgroun η NN N N
12 Princiles of Exclusive Measurement at GSI/FAIR Tagging high-momentum rotons ( MeV) Y.K. Tanaka an Y. Higashi 3 10 η η Signals η η η Nη η η η N N η NN N N Proton Kinetic Energy [MeV] 12
13 13 Ste-by-ste aroach Measurement Objectives S/N GSI (,) inclusive extremely goo statistics for overall structure + BK stuy oor GSI/FAIR Day 1 (,) exclusive* extene sensitivity for excite + groun states goo FAIR Day 1 (,x) exclusive* exclusive + ecay moe stuies goo
14 14 First ste Inclusive measurement GSI SIS-S437 in 2014/Aug
15 Prouction setu at FRS beam (T = 2.5 GeV) 12C target 2 (4 g/cm ) ~ 4 k/sill at S4 (signal) ~ 800 k/sill at S4 (backgroun) 18m S2 MWDC 2 Achromatic SC AC Disersive (3.6cm/%) S4 Scintillator (SC) Aerogel Cherenkov (AC) Fragment Searator (FRS) 15
16 Prouction setu at FRS beam (T = 2.5 GeV) 12C target 18m 2 (4 g/cm ) S2 ~ 4 k/sill at S4 (signal) ~ 800 k/sill at S4 (backgroun) erfect PID MWDC 2 Achromatic SC AC Disersive (3.6cm/%) S4 Scintillator (SC) Aerogel Cherenkov (AC) Fragment Searator (FRS) 16
17 Sectrometer settings for wie mass region FRS scaling -2% Region in excitation energy 0% +2% Eex - E0 [MeV] Prouction run (~ 5 ays) - 7 settings of FRS Bρ from -2% to 2% -90 MeV < Eex-E0 < +40 MeV covere - sectrometer calibration every 6 hours 17
18 Calibration Run (T = 1.6 GeV ) 2 CD2 target(1 g/cm ) 18m (P = 2.82 GeV/c) ~mono-energetic at 0 egree S2 D(,) elastic scattering for ~mono-energetic isersive (3.6cm/%) S4 Fragment Searator (FRS) 18
19 Calibration Run Focal lane osition (online, ion-otics roughly correcte) Count % 0% reliminary FRS scaling by -2% 1% % 1000! X at Focal Plane [mm] σx = 2.7 mm (CD2 calibration run) - energy loss an straggling calculation - sectrometer momentum resolution - beam momentum srea Execte mass resolution : σ ~ 2 MeV/c 2 (rouction run) 19
20 20 Samle sectrum of a very small art of accumulate ata 12 C(,) T = 2.5 GeV reliminary counts / 2 [MeV/c 2 ] run864 ~ 1 % of statistics for a FRS setting. Accetance uncorrecte (V, W )= (150, 5) MeV 0 0 counts/2mev cf. simulation Excitation Energy [MeV]
21 5cm-thick PS 1cm-thick PS 21 For next ste Pilot run for exclusive measurement at GSI Target 12 C 20 g Scintillators D1 D2 high-refractive-inex (n~1.2) aerogel high-refractive-inex (n~1.2) aerogel 5cm-thick PS brass 1cm-thick PS brass 10cm 10cm D3 beam um D4 MWDC trigger~400/sill bk 80k/sill high-refractive-inex (n~1.2) aerogel Beam T = 2.5 GeV I > 10 8 /sill 1cm-thick PS brass 5cm-thick PS 10cm Backgroun suression by signal tagging η N
22 Roama for η FAIR GSI Construction of roton etector Prouction exclusive measurement Systematic stuy Decay moe stuy Better stat./pilot exclusive 4i installation S437 analysis measurement Detector test 4i etector eveloment high-refractive-inex (n~1.2) aerogel 1cm-thick PS brass 10cm 5cm-thick PS unofficial roama (or wishes) 22
23 23 Summary Search for η meson boun states in 11 C by missing mass sectroscoy at GSI/FAIR η is interesting in relation to UA(1) anomaly χ-symmetry Just finishe first hysics run for inclusive (,) PID erfect Successfully accumulate targete statistics with goo resolution ~ 2 MeV/c 2 Prearation for semi-exclusive measurement
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