Search for Medium Modifications of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ρ</mml:mi></mml:math>Meson

Nasseripour, R.; Wood, M. H.; Djalali, C.; Weygand, D. P.; Tur, C.; Mosel, U.; Muehlich, P.; Adams, G. S.; Amaryan, M. J.; Ambrozewicz, P.; Anghinolfi, M.; Asryan, G.; Avakian, H.; Bagdasaryan, H.; Baillie, N.; Ball, J.; Baltzell, N. A.; Barrow, S.; Battaglieri, M.; Bedlinskiy, I.; Bektasoglu, M.; Bellis, M.; Benmouna, N.; Berman, B. L.; Biselli, A. S.; Blaszczyk, L.; Bouchigny, S.; Boiarinov, S.; Bradford, R.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Bültmann, S.; Burkert, V. D.; Butuceanu, C.; Calarco, J. R.; Careccia, S. L.; Carman, D. S.; Carnahan, B.; Casey, L.; Chen, S.; Cole, P. L.; Collins, P.; Coltharp, P.; Crabb, D.; Crannell, H.; Credé, V.; Cummings, J. P.; Dashyan, N.; Masi, R. De; Vita, R. De; Sanctis, E. De; Degtyarenko, P. V.; Denizli, H.; Dennis, L.; Deur, A.; Dharmawardane, K. V.; Dickson, R.; Dodge, G. E.; Doughty, D.; Dugger, M.; Dytman, S.; Dzyubak, O. P.; Egiyan, H.; Egiyan, K. S.; Fassi, L. El; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Feldman, G.; Feuerbach, R. J.; Funsten, H. O.; Garçon, M.; Gavalian, G.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Gordon, C. I O; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guler, N.; Guo, L.; Gyurjyan, V.; Hadjidakis, C.; Hafidi, K.; Hakobyan, H.; Hakobyan, R.; Hanretty, C.; Hardie, J.; Hersman, F. W.; Hicks, K.; Hleiqawi, I.; Holtrop, M.; Hyde-Wright, C. E.; Ilieva, Y.; Ireland, D. G.; Ишханов, Б. С.; Isupov, E. L.; Ito, M. M.; Jenkins, David; Jo, H. S.; Johnstone, J. R.; Joo, K. S.; Juengst, H. G.; Kalantarians, N.; Kellie, J. D.; Khandaker, M.; Kim, W.; Klein, A.; Klein, F.; Klimenko, A. V.; Kossov, M.; Krahn, Z.; Kramer, L. H.; Kubarovsky, V.; Kühn, J.; Kuhn, S. E.; Kuleshov, S. V.; Lachniet, J.; Laget, J. M.; Langheinrich, J.; Lawrence, D.; Li, Ji; Livingston, K.; Lu, H. Y.; MacCormick, M.; Markov, N.; Mattione, P.; McAleer, S.; McKinnon, B.; McNabb, J. W.; Mecking, B. A.; Mehrabyan, S.; Melone, J. J.; Mestayer, M. D.; Meyer, C. A.; Mibe, T.; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Moriya, K.; Morrow, S. A.; Moteabbed, M.; Muêller, J.; Munévar, E.; Mutchler, G. S.; Nadel-Turoński, P.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B.; Niroula, M. R.; Niyazov, R. A.; Nozar, M.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Paterson, C.; Pereira, S. Anefalos; Pierce, J.; Pivnyuk, N.; Počanić, D.; Pogorelko, O.; Pozdniakov, S.; Preedom, B. M.; Price, J. W.; Prok, Y.; Protopopescu, D.; Raue, B. A.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, Barry; Ronchetti, F.; Rosner, G.; Rossi, P.; Sabatié, F.; Salamanca, J.; Salgado, C.; Santoro, J. P.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Sharabian, Y. G.; Sharov, D.; Shvedunov, N. V.; Smith, E.; Smith, L. C.; Sober, D. I.; Sokhan, D.; Stavinsky, A.; Stepanyan, S.; Stokes, B. E.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tedeschi, D. J.; Tkabladze, A.; Tkachenko, S.; Todor, L.; Ungaro, M.; Vineyard, M. F.; Vlassov, A. V.; Watts, D. P.; Weinstein, Larry; Williams, M.; Wolin, E.; Yegneswaran, A.; Zana, L.; Zhang, Bohan; Zhang, Jian; Zhao, B.; Zhao, Z. W.

doi:10.1103/physrevlett.99.262302

Cited by 70 publications

(54 citation statements)

References 46 publications

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“…17 is shown the mass distribution generated by the photoproduction process for photons with energy E γ = 1.1 GeV on nucleus 56 Fe compared with experimental data [76]. We observe that the ρ mass spectrum is not symmetric, showing a slower increase of the yield as the mass increases up to ∼m ρ and a sharp decrease of the yield above this mass.…”

Section: The ρ Mass Spectramentioning

confidence: 84%

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Nuclear photoproduction of vector mesons within a Monte Carlo approach

2014

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We present recent improvements in the CRISP code for nuclear reaction simulation. The photoproduction of vector mesons was included in the code, which can evaluate also final state interaction of these mesons with the nucleus. Effects such as shadowing, subthreshold production, and Pauli blocking can be observed. The model is described in detail and some important quantities, such as cross section and nuclear transparency, are calculated as examples of the potential of our code.

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Section: The ρ Mass Spectramentioning

confidence: 84%

“…We observe that the ρ mass spectrum is not symmetric, showing a slower increase of the yield as the mass increases up to ∼m ρ and a sharp decrease of the yield above this mass. This 56 Fe compared with experimental data [76].…”

Section: The ρ Mass Spectramentioning

confidence: 88%

Nuclear photoproduction of vector mesons within a Monte Carlo approach

2014

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“…2 we compare our earlier calculations for the 56 Fe target with our improved calculation and with the CLAS data at JLab [15,16]. It also includes the comparison for the 12 C target.…”

Section: A Update Of Invariant-mass Spectra and Comparison To Clas Datamentioning

confidence: 95%

“…Using a 12-GeV proton beam at KEK, the E325 Collaboration reported a significant reduction in the ρ mass [14]. However, with a 1-3.5-GeV incident-energy photon beam at JLab, the CLAS Collaboration [15,16], using an absolutely normalized background subtraction procedure, found not a significant mass shift but rather a moderate broadening of the dilepton excess spectrum associated with ρ decays (cf. also Ref.…”

Section: Introductionmentioning

confidence: 99%

Medium modifications of theρmeson in nuclear photoproduction

et al. 2010

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We extend our recent study of dilepton invariant-mass spectra from the decays of ρ mesons produced by photon reactions off nuclei. We specifically focus on experimental spectra as recently measured by the CLAS Collaboration at the Thomas Jefferson National Accelerator Facility using carbon and iron nuclei. Building on our earlier work, we broaden our description to a larger set of observables to identify sensitivities to the medium effects predicted by microscopic calculations of the ρ spectral function. We compute mass spectra for several target nuclei and study the spectral shape as a function of the three-momentum of the outgoing lepton pair. We also compute the so-called nuclear transparency ratio, which provides an alternative means (and thus consistency check) of estimating the ρ width in the cold nuclear medium.

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“…Medium modifications of vector meson properties (masses/widths) in heated and/or dense nuclear matter can provide evidence for a partial restoration of chiral symmetry [1][2][3][4][5][6][7]. Photon-induced nuclear reactions [8][9][10][11][12][13][14][15] have been recently used for this purpose and represent some advantages in comparison with heavy-ion collisions, since the nucleus is close to equilibrium and the nuclear cross section (σ A ) is expected to scale with the nucleon cross section (σ N ) for the case of incoherent photoproduction.Recent data from the E01-112 experiment at the Thomas Jefferson Laboratory (JLab) [14] indicate a much stronger ω absorption in nuclei than the one deduced from the CBELSA/TAPS Collaboration results [11]. Both experiments extracted the in-medium ω width via measurement of the nuclear transparencies normalized to carbon (T A /T C ).…”

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confidence: 99%

Attenuation ofωmesons in cold nuclear matter

Rodrigues

Arruda‐Neto

2011

Phys. Rev. C

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The attenuation of ω mesons in cold nuclear matter has been investigated via the time-dependent multiplescattering Monte Carlo multicollisional (MCMC) intranuclear cascade model. The inelastic ω width deduced from CBELSA/TAPS Collaboration data of meson transparency in complex nuclei ( * 30 MeV/c 2 ) is approximately 5 times lower than the value obtained with recent theoretical models and consistent with an in-medium total ωN cross section within 25-30 mb for an average meson momentum of 1.1 GeV/c . The momentum-dependent transparency ratios suggest an elastic/total cross-section ratio around 40%. For the case of CLAS Collaboration data a much higher width is deduced ( * 120 MeV/c 2 ), with the MCMC model providing a consistent interpretation of the data, assuming a much higher meson absorption (σ * ωN 100 mb) for p ω ∼ 1.7 GeV/c. Medium modifications of vector meson properties (masses/widths) in heated and/or dense nuclear matter can provide evidence for a partial restoration of chiral symmetry [1][2][3][4][5][6][7]. Photon-induced nuclear reactions [8][9][10][11][12][13][14][15] have been recently used for this purpose and represent some advantages in comparison with heavy-ion collisions, since the nucleus is close to equilibrium and the nuclear cross section (σ A ) is expected to scale with the nucleon cross section (σ N ) for the case of incoherent photoproduction.Recent data from the E01-112 experiment at the Thomas Jefferson Laboratory (JLab) [14] indicate a much stronger ω absorption in nuclei than the one deduced from the CBELSA/TAPS Collaboration results [11]. Both experiments extracted the in-medium ω width via measurement of the nuclear transparencies normalized to carbon (T A /T C ).Three different models were used for the analyses of the data of Refs. [11,14]: a Glauber approach [16-18], a Boltzmann-Uehling-Uhlenbeck (BUU) transport model [18], and a calculation by the Valencia theory group [19]. For CBELSA/TAPS results the hadronic decay channel ω → π 0 γ was detected and all the models found a width ∼30 times higher than the vacuum value (225 − 260 MeV/c 2 in the ω rest frame) and an average ωN inelastic cross section of ∼70 mb. For CLAS Collaboration data the leptonic decay ω → e + e − was used and none of the recent theoretical models explained the huge ω absorption, which suggested an in-medium width greater than 200 MeV/c 2 in the nuclear rest frame (∼480 MeV/c 2 in the ω rest frame). As reported in [14], the discrepancy between CLAS and CBELSA/TAPS could be due to the different average ω momentum and/or decay modes. Furthermore, since the ρ meson also decays into e + e − , a destructive ρ − ω interference could play an important role in [14].Consequently, the aim of this Rapid Communication is to investigate the strong absorptions observed for the ω mesons [11,14] in terms of the ωN interaction (elastic or inelastic) without further assumptions about the influence of QCD condensates [20] and/or ω mass shifts (lowering) at finite densities [2]. Our strategy is to determine the in-medium ωN cros...

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Search for Medium Modifications of theρMeson

Cited by 70 publications

References 46 publications

Nuclear photoproduction of vector mesons within a Monte Carlo approach

Nuclear photoproduction of vector mesons within a Monte Carlo approach

Medium modifications of theρmeson in nuclear photoproduction

Attenuation ofωmesons in cold nuclear matter

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