Measurement of the proton structure function F2 at very low Q2 at HERA

Zeus Collaboration

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

A measurement of the proton structure function F2(x, Q2) is presented in the kinematic range 0.045 GeV2 < Q2 < 0.65 GeV2 and 6 · 10-7 < x < 1 · 10-3. The results were obtained using a data sample corresponding to an integrated luminosity of 3.9pb-1 in e+ p reactions recorded with the ZEUS detector at HERA. Information from a silicon-strip tracking detector, installed in front of the small electromagnetic calorimeter used to measure the energy of the final-state positron at small scattering angles, together with an enhanced simulation of the hadronic final state, has permitted the extension of the kinematic range beyond that of previous measurements. The uncertainties in F2 are typically less than 4%. At the low Q2 values of the present measurement, the rise of F2 at low x is slower than observed in HERA data at higher Q2 and can be described by Regge theory with a constant logarithmic slope δlnF2/δln(1/x). The dependence of F2 on Q2 is stronger than at higher Q2 values, approaching, at the lowest Q2 values of this measurement, a region where F2 becomes nearly proportional to Q2. (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)53-73
Number of pages21
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume487
Issue number1-2
DOIs
Publication statusPublished - 2000 Aug 10

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protons
kinematics
detectors
calorimeters
positrons
strip
luminosity
slopes
electromagnetism
silicon
scattering
simulation
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Measurement of the proton structure function F2 at very low Q2 at HERA. / Zeus Collaboration.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 487, No. 1-2, 10.08.2000, p. 53-73.

Research output: Contribution to journalArticle

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abstract = "A measurement of the proton structure function F2(x, Q2) is presented in the kinematic range 0.045 GeV2 < Q2 < 0.65 GeV2 and 6 · 10-7 < x < 1 · 10-3. The results were obtained using a data sample corresponding to an integrated luminosity of 3.9pb-1 in e+ p reactions recorded with the ZEUS detector at HERA. Information from a silicon-strip tracking detector, installed in front of the small electromagnetic calorimeter used to measure the energy of the final-state positron at small scattering angles, together with an enhanced simulation of the hadronic final state, has permitted the extension of the kinematic range beyond that of previous measurements. The uncertainties in F2 are typically less than 4{\%}. At the low Q2 values of the present measurement, the rise of F2 at low x is slower than observed in HERA data at higher Q2 and can be described by Regge theory with a constant logarithmic slope δlnF2/δln(1/x). The dependence of F2 on Q2 is stronger than at higher Q2 values, approaching, at the lowest Q2 values of this measurement, a region where F2 becomes nearly proportional to Q2. (C) 2000 Elsevier Science B.V.",
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AU - Zeus Collaboration

AU - Breitweg, J.

AU - Chekanov, S.

AU - Derrick, M.

AU - Krakauer, D.

AU - Magill, S.

AU - Pellegrino, A.

AU - Repond, J.

AU - Stanek, R.

AU - Yoshida, R.

AU - Mattingly, M. C.K.

AU - Abbiendi, G.

AU - Anselmo, F.

AU - Antonioli, P.

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AU - Bruni, G.

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AU - Contin, A.

AU - Coppola, N.

AU - Corradi, M.

AU - De Pasquale, S.

AU - Giusti, P.

AU - Iacobucci, G.

AU - Laurenti, G.

AU - Levi, G.

AU - Margotti, A.

AU - Massam, T.

AU - Nania, R.

AU - Palmonari, F.

AU - Pesci, A.

AU - Polini, A.

AU - Sartorelli, G.

AU - Zamora Garcia, Y.

AU - Zichichi, A.

AU - Amelung, C.

AU - Bornheim, A.

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AU - Coböken, K.

AU - Crittenden, J.

AU - Deffner, R.

AU - Hartmann, H.

AU - Heinloth, K.

AU - Hilger, E.

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N2 - A measurement of the proton structure function F2(x, Q2) is presented in the kinematic range 0.045 GeV2 < Q2 < 0.65 GeV2 and 6 · 10-7 < x < 1 · 10-3. The results were obtained using a data sample corresponding to an integrated luminosity of 3.9pb-1 in e+ p reactions recorded with the ZEUS detector at HERA. Information from a silicon-strip tracking detector, installed in front of the small electromagnetic calorimeter used to measure the energy of the final-state positron at small scattering angles, together with an enhanced simulation of the hadronic final state, has permitted the extension of the kinematic range beyond that of previous measurements. The uncertainties in F2 are typically less than 4%. At the low Q2 values of the present measurement, the rise of F2 at low x is slower than observed in HERA data at higher Q2 and can be described by Regge theory with a constant logarithmic slope δlnF2/δln(1/x). The dependence of F2 on Q2 is stronger than at higher Q2 values, approaching, at the lowest Q2 values of this measurement, a region where F2 becomes nearly proportional to Q2. (C) 2000 Elsevier Science B.V.

AB - A measurement of the proton structure function F2(x, Q2) is presented in the kinematic range 0.045 GeV2 < Q2 < 0.65 GeV2 and 6 · 10-7 < x < 1 · 10-3. The results were obtained using a data sample corresponding to an integrated luminosity of 3.9pb-1 in e+ p reactions recorded with the ZEUS detector at HERA. Information from a silicon-strip tracking detector, installed in front of the small electromagnetic calorimeter used to measure the energy of the final-state positron at small scattering angles, together with an enhanced simulation of the hadronic final state, has permitted the extension of the kinematic range beyond that of previous measurements. The uncertainties in F2 are typically less than 4%. At the low Q2 values of the present measurement, the rise of F2 at low x is slower than observed in HERA data at higher Q2 and can be described by Regge theory with a constant logarithmic slope δlnF2/δln(1/x). The dependence of F2 on Q2 is stronger than at higher Q2 values, approaching, at the lowest Q2 values of this measurement, a region where F2 becomes nearly proportional to Q2. (C) 2000 Elsevier Science B.V.

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

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