Double-tag events in two-photon collisions at LEP

L3 Collaboration

doi:10.1016/S0370-2693(02)01340-0

Double-tag events in two-photon collisions at LEP

L3 Collaboration

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Abstract

Double-tag events in two-photon collisions are studied using the L3 detector at LEP centre-of-mass energies from √s = 189 GeV to 209 GeV. The cross sections of the e⁺e^- → e⁺e^-hadrons and Y^∗Y^∗ → hadrons processes are measured as a function of the product of the photon virtualities, Q² = √Q² ₁Q² ₂, of the two-photon mass, W_YY, and of the variable Y = ln(W² _YY/Q²). The average photon virtuality is 〈Q² ₁〉 = 〈Q² ₂〉 = 16 GeV². The results are in agreement with next-to-leading order calculations for the process Y^∗Y^∗ → qq in the interval 2 ≤ Y ≤ 5. An excess is observed in the interval 5 < Y ≤ 7, corresponding to W_YY greater than 40 GeV. This may be interpreted as a contribution of resolved photon QCD processes or the onset of BFKL phenomena.

Original language	English (US)
Pages (from-to)	39-51
Number of pages	13
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	531
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(02)01340-0
State	Published - Apr 4 2002

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/S0370-2693(02)01340-0

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@article{4603abce919b446189890ec573054f7b,

title = "Double-tag events in two-photon collisions at LEP",

abstract = "Double-tag events in two-photon collisions are studied using the L3 detector at LEP centre-of-mass energies from √s = 189 GeV to 209 GeV. The cross sections of the e+e- → e+e-hadrons and Y∗Y∗ → hadrons processes are measured as a function of the product of the photon virtualities, Q2 = √Q2 1Q2 2, of the two-photon mass, WYY, and of the variable Y = ln(W2 YY/Q2). The average photon virtuality is 〈Q2 1〉 = 〈Q2 2〉 = 16 GeV2. The results are in agreement with next-to-leading order calculations for the process Y∗Y∗ → qq in the interval 2 ≤ Y ≤ 5. An excess is observed in the interval 5 < Y ≤ 7, corresponding to WYY greater than 40 GeV. This may be interpreted as a contribution of resolved photon QCD processes or the onset of BFKL phenomena.",

author = "\{L3 Collaboration\} and P. Achard and O. Adriani and M. Aguilar-Benitez and J. Alcaraz and G. Alemanni and J. Allaby and A. Aloisio and Alviggi, \{M. G.\} and H. Anderhub and Andreev, \{V. P.\} and F. Anselmo and A. Arefiev and T. Azemoon and T. Aziz and P. Bagnaia and A. Bajo and G. Baksay and L. Baksay and Baldew, \{S. V.\} and S. Banerjee and Sw Banerjee and A. Barczyk and R. Barill{\`e}re and P. Bartalini and M. Basile and N. Batalova and R. Battiston and A. Bay and F. Becattini and U. Becker and F. Behner and L. Bellucci and R. Berbeco and J. Berdugo and P. Berges and B. Bertucci and Betev, \{B. L.\} and M. Biasini and M. Biglietti and A. Biland and Blaising, \{J. J.\} and Blyth, \{S. C.\} and Bobbink, \{G. J.\} and A. B{\"o}hm and L. Boldizsar and B. Borgia and S. Bottai and D. Bourilkov and M. Bourquin and Tully, \{Christopher George\}",

year = "2002",

month = apr,

day = "4",

doi = "10.1016/S0370-2693(02)01340-0",

language = "English (US)",

volume = "531",

pages = "39--51",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "1-2",

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TY - JOUR

T1 - Double-tag events in two-photon collisions at LEP

AU - L3 Collaboration

AU - Achard, P.

AU - Adriani, O.

AU - Aguilar-Benitez, M.

AU - Alcaraz, J.

AU - Alemanni, G.

AU - Allaby, J.

AU - Aloisio, A.

AU - Alviggi, M. G.

AU - Anderhub, H.

AU - Andreev, V. P.

AU - Anselmo, F.

AU - Arefiev, A.

AU - Azemoon, T.

AU - Aziz, T.

AU - Bagnaia, P.

AU - Bajo, A.

AU - Baksay, G.

AU - Baksay, L.

AU - Baldew, S. V.

AU - Banerjee, S.

AU - Banerjee, Sw

AU - Barczyk, A.

AU - Barillère, R.

AU - Bartalini, P.

AU - Basile, M.

AU - Batalova, N.

AU - Battiston, R.

AU - Bay, A.

AU - Becattini, F.

AU - Becker, U.

AU - Behner, F.

AU - Bellucci, L.

AU - Berbeco, R.

AU - Berdugo, J.

AU - Berges, P.

AU - Bertucci, B.

AU - Betev, B. L.

AU - Biasini, M.

AU - Biglietti, M.

AU - Biland, A.

AU - Blaising, J. J.

AU - Blyth, S. C.

AU - Bobbink, G. J.

AU - Böhm, A.

AU - Boldizsar, L.

AU - Borgia, B.

AU - Bottai, S.

AU - Bourilkov, D.

AU - Bourquin, M.

AU - Tully, Christopher George

PY - 2002/4/4

Y1 - 2002/4/4

N2 - Double-tag events in two-photon collisions are studied using the L3 detector at LEP centre-of-mass energies from √s = 189 GeV to 209 GeV. The cross sections of the e+e- → e+e-hadrons and Y∗Y∗ → hadrons processes are measured as a function of the product of the photon virtualities, Q2 = √Q2 1Q2 2, of the two-photon mass, WYY, and of the variable Y = ln(W2 YY/Q2). The average photon virtuality is 〈Q2 1〉 = 〈Q2 2〉 = 16 GeV2. The results are in agreement with next-to-leading order calculations for the process Y∗Y∗ → qq in the interval 2 ≤ Y ≤ 5. An excess is observed in the interval 5 < Y ≤ 7, corresponding to WYY greater than 40 GeV. This may be interpreted as a contribution of resolved photon QCD processes or the onset of BFKL phenomena.

AB - Double-tag events in two-photon collisions are studied using the L3 detector at LEP centre-of-mass energies from √s = 189 GeV to 209 GeV. The cross sections of the e+e- → e+e-hadrons and Y∗Y∗ → hadrons processes are measured as a function of the product of the photon virtualities, Q2 = √Q2 1Q2 2, of the two-photon mass, WYY, and of the variable Y = ln(W2 YY/Q2). The average photon virtuality is 〈Q2 1〉 = 〈Q2 2〉 = 16 GeV2. The results are in agreement with next-to-leading order calculations for the process Y∗Y∗ → qq in the interval 2 ≤ Y ≤ 5. An excess is observed in the interval 5 < Y ≤ 7, corresponding to WYY greater than 40 GeV. This may be interpreted as a contribution of resolved photon QCD processes or the onset of BFKL phenomena.

UR - https://www.scopus.com/pages/publications/0037018407

UR - https://www.scopus.com/pages/publications/0037018407#tab=citedBy

U2 - 10.1016/S0370-2693(02)01340-0

DO - 10.1016/S0370-2693(02)01340-0

M3 - Article

SN - 0370-2693

VL - 531

SP - 39

EP - 51

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

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

IS - 1-2

ER -

Double-tag events in two-photon collisions at LEP

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