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10 results on '"Rachele Di Salvo"'

1. K0SΣ0 photoproduction at the BGO-OD experiment

Author

T. C. Jude, A. Polonski, B.-E. Reitz, D. Elsner, V. Tarakanov, Christian Tillmanns, Giuseppe Mandaglio, Alessandro Braghieri, V. G. Nedorezov, Philip Cole, A. Fantini, Reinhard Beck, Paolo Levi Sandri, N. G. Kozlenko, A. M. Lapik, V. V. Sumachev, D. Moricciani, R. Messi, S. Alef, Rachele Di Salvo, D. Hammann, J. Hannappel, Francesco Oliver, K. Kohl, Valery Lisin, H. Schmieden, A. B. Gridnev, Patrick Bauer, O. Freyermuth, M. Romaniuk, D. V. Novinsky, G. Scheluchin, and P. Pedroni

Subjects
Physics, Spectrometer, Meson, 010308 nuclear & particles physics, QC1-999, Settore FIS/04, Momentum transfer, Nuclear Theory, Strangeness, 01 natural sciences, Nuclear physics, Dipole, 0103 physical sciences, Neutron, High Energy Physics::Experiment, 010306 general physics, Nucleon, Nuclear Experiment, Excitation
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon via meson photoproduction. The setup with a BGO calorimeter surrounding the target and an open dipole spectrometer covering the for ward region is ideally suited for investigating low momentum transfer processes, in particular in strangeness photoproduction. The associated photoproduction of K0S and hyperons is essential to understand the role of K* exchange mech anisms. A cusp-like structure observed in the yp → K0SΣ+ reaction at the K* threshold is described by models including dynamically generated resonances from vector meson-baryon interactions. Such interactions are pre dicted to give a peak like structure in K0SΣ0 photoproduction off the neutron. A very preliminary cross section is determined and compared to the prediction, the results appear to support the model

Published
2020

2. Strangeness photoproduction at the BGO-OD experiment

Author

H. Schmieden, D. Elsner, A. B. Gridnev, N. G. Kozlenko, V. G. Nedorezov, Patrick Bauer, A. M. Lapik, T. C. Jude, G. Scheluchin, Christian Tillmanns, Valery Lisin, Alessandro Braghieri, S. Alef, Philip Cole, Paolo Levi Sandri, M. Romaniuk, B.-E. Reitz, V. Tarakanov, D. V. Novinsky, R. Messi, D. Hammann, F. Ghio, P. Pedroni, Rachele Di Salvo, D. Moricciani, O. Freyermuth, J. Hannappel, A. Polonski, K. Kohl, A. Fantini, Giuseppe Mandaglio, Reinhard Beck, and V. V. Sumachev

Subjects
Particle physics, QC1-999, Nuclear Theory, FOS: Physical sciences, Strangeness, strangeness photoproduction, 01 natural sciences, Charm quark, Momentum, Nuclear physics, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, Spectrometer, 010308 nuclear & particles physics, BGO-OD, Settore FIS/04, Momentum transfer, Pentaquark, Λ(1405), High Energy Physics::Experiment, Nucleon, Excitation
Abstract

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles. BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to low momentum exchange kinematics where extended, molecular structure may manifest in reaction mechanisms. First key results at low $t$ indicate a cusp-like structure in $K^+\Sigma^0$ photoproduction at $W = 1900$\,MeV, line shapes and differential cross sections for $K^+\Lambda$(1405)$\rightarrow K^+\Sigma^0\pi^0$, and a peak structure in $K^0_S\Sigma^0$ photoproduction. The peak in the $K^0_S\Sigma^0$ channel appears consistent with meson-baryon generated states, where equivalent models have been used to describe the $P_C$ pentaquark candidates in the heavy charmed quark sector., Comment: Proceedings of The 12th International Workshop on the Physics of Excited Nucleons (NSTAR 2019)

Published
2020

3. η’ beam asymmetry at threshold using the BGO-OD experiment

Author

Philip Cole, D. V. Novinsky, D. Hammann, A. M. Lapik, T. C. Jude, G. Scheluchin, Reinhard Beck, D. Moricciani, V. V. Sumachev, K. Kohl, Paolo Levi Sandri, V. G. Nedorezov, Patrick Bauer, R. Messi, M. Romaniuk, A. Fantini, Christian Tillmanns, Alessandro Braghieri, Valery Lisin, Rachele Di Salvo, A. Polonski, Giuseppe Mandaglio, J. Hannappel, O. Freyermuth, N. G. Kozlenko, P. Pedroni, H. Schmieden, A. B. Gridnev, V. Tarakanov, S. Alef, B.-E. Reitz, F. Ghio, and D. Elsner

Subjects
Physics, Proton, Meson, Spectrometer, 010308 nuclear & particles physics, Settore FIS/04, media_common.quotation_subject, QC1-999, 01 natural sciences, Signal, Resonance (particle physics), Asymmetry, Charged particle, Nuclear physics, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Beam (structure), media_common
Abstract

The unexpected nodal structure of the beam asymmetry recently reported by the GRAAL collaboration in η′ photoproduction very close to threshold could be explained by a previously unobserved narrow resonance. The BGO-OD experiment is ideally suited to verify this measurement via the detection of forward going charged particles which in the threshold region of interest allows the identification of the reaction γp → η′ p solely based on the proton going in the forward direction. This yields unprecedented statistics if, in the missing mass analysis of the η′ meson, the background can be sufficiently well controlled. Preliminary results using a linearly polarised photon beam are shown. The reaction γp → η′ p was identified in the BGO forward spectrometer, with simulated data used to seperate signal and background.

Published
2020

4. The BGOOD experiment at ELSA Exotic structures in the strange quark sector?

Author

Thomas Jude, Stefan Alef, Reinhard Beck, Alessandro Braghieri, Philip Cole, Rachele Di Salvo, Daniel Elsner, Alessia Fantini, Oliver Freyermuth, Frank Fromberger, Francesco Ghio, Johannes Groß, Katrin Kohl, Paolo Levi Sandri, Guiseppe Mandaglio, Paolo Pedroni, Mariia Romaniuk, Georg Scheluchin, and Hartmut Schmieden

Abstract

The BGOOD photoproduction experiment accesses forward meson angles and low momentum exchange kinematics in the uds sector, which may be sensitive to molecular-like hadronic structure. Recent highlights are summarised in these proceedings.

Published
2022

5. K+Λ(1405) photoproduction at the BGO-OD experiment

Author

Valery Lisin, Reinhard Beck, D. Elsner, A. Fantini, D. V. Novinsky, Giuseppe Mandaglio, K. Kohl, V. G. Nedorezov, V. V. Sumachev, G. Scheluchin, Paolo Levi Sandri, T. C. Jude, Mariia Romaniuk, B.-E. Reitz, V. Tarakanov, Christian Tillmanns, A. Polonski, O. Freyermuth, Patrick Bauer, Alessandro Braghieri, P. Pedroni, Philip Cole, A. M. Lapik, J. Hannappel, N. G. Kozlenko, Dario Moricciani, F. Ghio, D. Hammann, R. Messi, H. Schmieden, Rachele Di Salvo, A. B. Gridnev, and S. Alef

Subjects
Physics, Spectrometer, 010308 nuclear & particles physics, Settore FIS/04, QC1-999, High Energy Physics::Phenomenology, Constituent quark, Large aperture, 01 natural sciences, Measure (mathematics), Calorimeter, Crystal, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, 010306 general physics
Abstract

Since the discovery of the Λ(1405), it remains poorly described by conventional constituent quark models, and it is a candidate for having an “exotic” meson-baryon or “penta-quark” structure, similar to states recently reported in the hidden charm sector.The Λ(1405) can be produced in the reactionγpK+Λ(1405). The pure I=0 decay mode into Σ0π0is prohibited for the mass-overlapping Σ(1385). Combining a large aperture forward magnetic spectrometer and a central BGO crystal calorimeter, the BGO-OD experiment is ideally suited to measure this decay with theK+in the forward direction. Preliminary results are presented.*Supported by DFG (PN 388979758, 405882627)

Published
2020

6. The virtual compton scattering at TJNAF

Author

Rachele Di Salvo

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Photon, Proton, Scattering, Nuclear Theory, Compton scattering, General Physics and Astronomy, Virtual particle, Inelastic scattering, Deep inelastic scattering, Resonance (particle physics), Atomic and Molecular Physics, and Optics, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Through the Virtual Compton Scattering it is possible to cause electromagnetic deformations of the proton and hence to probe its internal structure. The VCS experiment E93050 performed in Hall A at TJNAF is now giving its first results: cross sections have been extracted below pion threshold and in the resonance region, providing an evidence of the generalised polarisabilities of the proton and giving new stringent inputs to theoretical models.

Published
2002

7. Result and perspectives on meson spectroscopy with KLOE and KLOE-2

Author

Ivano Sarra, Salvatore Fiore, Eryk Czerwiński, Dario Moricciani, Vincenzo PATERA, Pawel Moskal, Paolo Gauzzi, Roberto Versaci, Paolo Branchini, Davide Badoni, Lorenzo Iafolla, Federico Nguyen, Matteo Martini, Caterina Bloise, Camilla Di Donato, Onofrio ERRIQUEZ, Marek Jacewicz, Tord Johansson, Simona Giovannella, Rachele Di Salvo, and Giuseppe Mandaglio

Subjects
Nuclear physics, Physics, Particle physics, Meson, High Energy Physics::Phenomenology, Eta meson, High Energy Physics::Experiment, Nuclear Experiment, Spectroscopy, Boson
Abstract

From 2000 to 2006 KLOE has collected 2.5 fb−1 of e+e− collisions at the peak of the φ(1020) and 250 pb−1 off-peak. In this paper the most recent results on meson spectroscopy are presented, with emphasis on rare eta meson decays, the search for the U boson, and γγ collisions.

Published
2013

8. The GRAAL experiment: Beam polarization asymmetries in pseudoscalar meson photoproduction

Author

M. Castoldi, G. Berrier, E. Guinault, M. Taiuti, J. Ajaka, Rachele Di Salvo, D. Moricciani, J. P. Bocquet, P. Corvisiero, L. H. Rosier, A. D'Angelo, D. Rebreyend, G. Gervino, F. Ghio, J. Van de Wiele, C. Perrin, M. L. Sperduto, O. Bartalini, E. Hourany, V. Bellini, J. P. Didelez, A. Sudov, M. A. Duval, L. Ciciani, M. Guidal, A. M. Lapik, M. Breuer, R. Frascaria, L. Casano, C. Schaerf, P. Levi Sandri, C. Gaulard, F. Renard, V. Kuznetsov, N. V. Rudnev, L. Nicoletti, Alessandro Zucchiatti, Marco Capogni, M. Sanzone, M. Ripani, M. Anghinolfi, B. Girolami, A. Turinge, P. Girard, V. G. Nedorezov, M. Morlet, Annick Lleres, C. Djalali, P. Calvat, P. Rossi, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Particle physics, media_common.quotation_subject, PION-PHOTOPRODUCTION, ETA-PHOTOPRODUCTION, MONITORING-SYSTEM, SPIN OBSERVABLES, BGO CALORIMETER, RESONANCES, THRESHOLD, PROTON, NUCLEI, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Asymmetry, Pseudoscalar meson, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics, media_common, Physics, 010308 nuclear & particles physics, Scattering, Beam polarization, Energy (signal processing), Beam (structure)
Abstract

The GRAAL tagged and polarized γ beam has been operating with a maximum energy of 1100 MeV. For the first time asymmetry results in ν photoproduction were obtained and will be shown. Interesting results have also been obtained for π0 and π+ photo-production, that largely confirm the already existing ones, but also extend in not yet explored angular and energetic regions, especially for backward scattering and energies greater than 900 MeV.

Published
1999

9. Precision Measurements of Hadronic Contributions to Muon Anomaly with the KLOE Detector

Author

Ivano Sarra, Salvatore Fiore, Eryk Czerwiński, Dario Moricciani, Vincenzo PATERA, Pawel Moskal, Paolo Gauzzi, Paolo Branchini, Wojciech Wislicki, Davide Badoni, Erika De Lucia, Lorenzo Iafolla, Federico Nguyen, Matteo Martini, Caterina Bloise, Camilla Di Donato, Onofrio ERRIQUEZ, Marek Jacewicz, Tord Johansson, Simona Giovannella, Rachele Di Salvo, and Giuseppe Mandaglio

Subjects
Physics, Nuclear physics, Particle physics, Muon, Detector, Hadron, General Physics and Astronomy, Anomaly (physics)
Published
2013

10. Double-polarization observables in pion-photoproduction from polarized HD at legs

Author

Sandorfi, A. M., Ardashev, K., Bade, C., Blecher, M., Caracappa, A., D Angelo, A., Rachele Di Salvo, Fantini, A., Gibson, C., Glückler, H., Hicks, K., Hoblit, S., Honig, A., Kageya, T., Khandaker, M., Kizilgul, S., Kistner, O., Kucuker, S., Lehmann, A., Lincoln, F., Lindgren, R., Lowry, M., Lucas, M., Mahon, J., Miceli, L., Moricciani, D., Norum, B., Pap, M., Preedom, B., Schaerf, C., Seyfarth, H., Ströher, H., Thorn, C., Wang, K., Wei, X., and Whisnant, C.

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