Exclusive electroproduction of two pions at HERA

By S. Chekanov, D. Krakauer, S. Magill, B. Musgrave, A. Pellegrino, J. Repond, R. Yoshida, M. Mattingly, P. Antonioli, G. Bari and 351 more. 2011

585 citations recorded by the source corpus.

The exclusive electroproduction of two pions in the mass range 0.4<Mππ<2.5 GeV has been studied with the ZEUS detector at HERA using an integrated luminosity of 82 pb−1. The analysis was carried out in the kinematic range of 2<Q2<80 GeV2, 32<W<180 GeV and |t|<0.6 GeV2, where Q2 is the photon virtuality, W is the photon-proton centre-of-mass energy and t is the squared four-momentum transfer at the proton vertex. The two-pion invariant-mass distribution is interpreted in terms of the pion electromagnetic form factor, |F(Mππ)|, assuming that the studied mass range includes the contributions of the ρ, ρ′ and ρ′′ vector-meson states. The masses and widths of the resonances were obtained and the Q2 dependence of the cross-section ratios σ(ρ′→ππ)/σ(ρ) and σ(ρ′′→ππ)/σ(ρ) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e+e−→π+π−.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/360f426e89bfc295b8931cfecf3dd4a4969644f4

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

Citations in the corpus

Heavy quarkonium: progress, puzzles, and opportunities (2010, methodology): “The ZEUS and H1 collaborations have published several measurements of inelastic J/ψ and ψ(2S) production that are based on data from HERA Run I [697, 760].”
Heavy-quark mass dependence in global PDF analyses and 3- and 4-flavour parton distributions (2010, methodology): “We also show a few of the (less precise) ZEUS data points [62].”
Variable-flavor number scheme for next-to-next-to-leading order (2006, unknown): “Its inclusion clearly improves the match to the data [12,13].”
HERAFitter - Open source QCD fit project (2014, background): “It has also provided a practical method to determine DPDFs from fits to the diffractive cross sections.”
A posteriori inclusion of parton density functions in NLO QCD final-state calculations at hadron colliders: the APPLGRID project (2009, methodology): “Full details of the data-sets, PDF parameterisation and other assumptions are given elsewhere [5].”
Elastic and proton-dissociative photoproduction of J/ψ mesons at HERA (2013, background): “7 [4, 5], and is thus incompatible with a universal Pomeron hypothesis [2].”
Parton Distribution Functions, $\alpha_s$ and Heavy-Quark Masses for LHC Run II (2017, methodology): “(ii) The data on production of bottom quark in e p DIS obtained by the H1 [15] and ZEUS [16] Collaborations are added.”