Photoproduction of Neutral<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ρ</mml:mi></mml:math>Mesons

McClellan, G.; Mistry, N. B.; Mostek, P.; Ogren, H. O.; Silverman, A.; Swartz, J.; Talman, R.

doi:10.1103/physrevd.4.2683

Cited by 28 publications

(16 citation statements)

References 23 publications

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“…This ratio is somewhat larger than that found by the ZEUS collaboration, |B/A| = 0.81 ± 0.04/ √ GeV at the same momentum transfer [14]. This is unexpected, since the ππ component should have a higher nuclear absorption cross section, so |B/A| should drop as the target atomic number increases [15].…”

Section: ρ 0 With Nuclear Excitation Analysiscontrasting

confidence: 40%

Observation of Au + Au $\rightarrow$ Au + Au + $\rho^0$ and Au + Au $\rightarrow$ Au$^$ + Au$^$ + $\rho^0$ with STAR

Klein

2002

APH

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Abstract. We report the first observation of the reactions Au + Au → Au + Au + ρ 0 and Au + Au → Au * + Au * + ρ 0 with the STAR detector. The ρ are produced at small perpendicular momentum, as expected if they couple coherently to both nuclei. We discuss models of vector meson production and the correlation with nuclear breakup, and present a fundamental test of quantum mechanics that is possible with the system.

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Section: ρ 0 With Nuclear Excitation Analysiscontrasting

confidence: 40%

Observation of Au + Au $\rightarrow$ Au + Au + $\rho^0$ and Au + Au $\rightarrow$ Au$^$ + Au$^$ + $\rho^0$ with STAR

Klein

2002

APH

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“…It is well known that the shape of the ρ 0 in photoproduction deviates from a pure BreitWigner resonance [7][8][9][10]27]. Several different parameterizations exist to describe the shape, with one of the most often used being a formula due to Söding, where a continuum amplitude, B, is added to the Breit-Wigner resonance [28]:…”

Section: Discussionmentioning

confidence: 99%

“…Photoproduction of ρ 0 vector mesons on nuclear targets has been studied in fixed target experiments with lepton beams [7], and more recently in ultra-peripheral collisions by the STAR Collaboration at RHIC at √ s NN = 62 [8], 130 [9], and 200 GeV [10]. STAR has also observed coherent photoproduction of the ρ 0 (1700) [11].…”

Section: Jhep09(2015)095mentioning

confidence: 99%

“…The excited nucleus typically decays by the emission of neutrons at very forward rapidities. The signature of these processes is thus a ρ 0 vector meson with very low transverse momentum which may be accompanied by a few neutrons at very forward rapidities but no other particles.Photoproduction of ρ 0 vector mesons on nuclear targets has been studied in fixed target experiments with lepton beams [7], and more recently in ultra-peripheral collisions by the STAR Collaboration at RHIC at √ s NN = 62 [8], 130 [9], and 200 GeV [10]. STAR has also observed coherent photoproduction of the ρ 0 (1700) [11].…”

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confidence: 99%

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Coherent ρ 0 photoproduction in ultra-peripheral Pb-Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV

Adam¹,

Adamová²,

Aggarwal³

et al. 2015

J. High Energ. Phys.

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Abstract:We report the first measurement at the LHC of coherent photoproduction of ρ 0 mesons in ultra-peripheral Pb-Pb collisions. The invariant mass and transverse momentum distributions for ρ 0 production are studied in the π + π − decay channel at mid-rapidity. The production cross section in the rapidity range |y| < 0.5 is found to be dσ/dy = 425 ± 10 (stat.) +42 −50 (sys.) mb. Coherent ρ 0 production is studied with and without requirement of nuclear breakup, and the fractional yields for various breakup scenarios are presented. The results are compared with those from lower energies and with model predictions. Keywords: Hadron-Hadron ScatteringArXiv ePrint: 1503.09177Open Access, Copyright CERN, for the benefit of the ALICE Collaboration. Article funded by SCOAP 3 .doi:10.1007/JHEP09(2015)095JHEP09 (2015)095 The ALICE collaboration 20 IntroductionCharged particle beams at the LHC generate an electromagnetic field which can be regarded as a beam of quasi-real photons; thus at the LHC, besides hadronic interactions, also photonuclear and photon-photon interactions occur. Collisions in which the impact parameter exceeds the sum of the radii of the incoming beam particles are called ultraperipheral collisions (UPC). In UPC the cross section for hadronic processes is strongly suppressed, while the cross sections for two-photon and photonuclear interactions remain large. This is particularly the case for heavy ions, because the intensity of the photon flux grows with the square of the ion charge, Z. A number of reviews of UPC are available; e.g., [1,2]. The ALICE Collaboration has previously studied exclusive photoproduction of J/ψ in ultra-peripheral Pb-Pb and p-Pb collisions [3][4][5]. Exclusive photoproduction of ρ 0 vector mesons, Pb + Pb → Pb + Pb + ρ 0 , can be described as the fluctuation of a quasi-real photon into a virtual ρ 0 vector meson, which then scatters elastically off the target nucleus. Two cases can be distinguished. When the interaction involves the complete target nucleus, the process is called coherent. In this case the target nucleus normally remains intact. If the virtual ρ 0 vector meson scatters off only one of the nucleons in the target, then the process is called incoherent and in this case the target nucleus normally breaks up, emitting neutrons at very forward rapidities. For coherent processes, the size of the lead ion restricts the mean transverse momentum of the vector meson to be about 60 MeV/c corresponding to a de Broglie wavelength of the nuclear size, while it is of the order of 500 MeV/c for incoherent processes.Because of the strong electromagnetic fields in ultra-peripheral collisions of heavy ions, multiple photons may be exchanged in a single event. The additional photons can lead to excitation of the nuclei. The dominant process is the excitation to a Giant Dipole Resonance [6]. As these photonuclear processes occur on a different time scale, they are -1 - JHEP09(2015)095assumed to be independent, so the probabilities factorize. The excited nucleus typically decays b...

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“…Parameters of the SVD fits of the Cornell group[16] to their own data, together with the input values of the phase ratio η.…”

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confidence: 99%

Nuclear shadowing and ρ photoproduction

Pautz

Shaw

1998

Phys. Rev. C

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photoproduction on complex nuclei is reexamined using a generalized vector dominance model which succesfully predicts the oberved nuclear shadowing in real photoabsorption and deep inelastic scattering. This model is shown to give a good fit to photoproduction data on both nucleons and complex nuclei, in which the disagreement between the measured ␥-coupling and the ␥-coupling required by the simple vector dominance model is eliminated. The N total cross sections required are similar to those predicted by the additive quark model, and the magnitude of the correction to simple vector dominance is consistent with that inferred from the analysis of real photoabsorption and deep inelastic scattering. ͓S0556-2813͑98͒00505-6͔

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Photoproduction of NeutralρMesons

Cited by 28 publications

References 23 publications

Observation of Au + Au $\rightarrow$ Au + Au + $\rho^0$ and Au + Au $\rightarrow$ Au$^$ + Au$^$ + $\rho^0$ with STAR

Observation of Au + Au $\rightarrow$ Au + Au + $\rho^0$ and Au + Au $\rightarrow$ Au$^$ + Au$^$ + $\rho^0$ with STAR

Coherent ρ 0 photoproduction in ultra-peripheral Pb-Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV

Nuclear shadowing and ρ photoproduction

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Photoproduction of NeutralρMesons

Cited by 28 publications

References 23 publications

Observation of Au + Au $\rightarrow$ Au + Au + $\rho^0$ and Au + Au $\rightarrow$ Au$^*$ + Au$^*$ + $\rho^0$ with STAR

Observation of Au + Au $\rightarrow$ Au + Au + $\rho^0$ and Au + Au $\rightarrow$ Au$^*$ + Au$^*$ + $\rho^0$ with STAR

Coherent ρ 0 photoproduction in ultra-peripheral Pb-Pb collisions at s N N = 2.76 $$ \sqrt{s_{\mathrm{NN}}}=2.76 $$ TeV

Nuclear shadowing and ρ photoproduction

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Observation of Au + Au $\rightarrow$ Au + Au + $\rho^0$ and Au + Au $\rightarrow$ Au$^$ + Au$^$ + $\rho^0$ with STAR

Observation of Au + Au $\rightarrow$ Au + Au + $\rho^0$ and Au + Au $\rightarrow$ Au$^$ + Au$^$ + $\rho^0$ with STAR