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.
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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 -