Summary
A feasibility study has been carried out for high-precision measurements of two-photon reactions leading to hadrons at the DAΦNE electron-positron collider. This new facility will operate at a c.m. energy of 1.02 GeV and up to a maximum of 1.5 GeV. It will have a luminosity ofL⋍5·1032 cm−2s−1, 100 times larger than the present available e+e− colliders. DAΦNE offers an excellent opportunity to study γγ reactions at low energy with high statistics, using the KLOE detector equipped with electron tagging facilities as described in this report. Among the various topics that one may address in these studies, we concentrate on the following: 1) Precision measurements of the polarizabilities of charged and neutral pions via the two-photon reactions γγ→ππ. These will allow tests of chiral theories and chiral perturbation techniques, as well as other theoretical approaches. 2) Measurements for the first time of the azimuthal correlations of the γγ→ππ and other two-photon reactions. These provide new tests of the validity of chiral and other theories. 3) Formation of theC=+1 light pseudoscalar mesons, π0, η and η′. This allows the study of the\(q\bar q\) and possibly gluonic inner structure of these mesons. For the π0 its measured radiative width will also improve the currently known lifetime. 4) The possibility to realize a double tagging at DAΦNE will allow reliable measurements of the currently little known total γγ→hadrons cross-section below 1 GeV, to be compared with several models. The physics program described abovecannot be realized without tagging the two-photon reactions to suppress the background from e+e− annihilation channels and other sources.
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References
KLOE,a general purpose detector for DAΦNE, LNF-92/019(R).
A. Courau: in DAΦNE,The Frascati Φ Factory, edited byG. Pancheri (1991), p. 373.
S. Bellucci andD. Babusci:Proceedings of the Frascati Workshop for Detectors and Physics at DAΦNE,Frascati, Italy, April 9–12 (1991), p. 351.
A. Courau andG. Pancheri: inThe DAΦNEPhysics Handbook, edited byL. Maiani, G. Pancheri andN. Paver (1992), p. 353.
V. A. Petrun’kin:Sov. J. Part. Nucl.,12, 278 (1981).
B. R. Holstein:Comments Nucl. Part. Phys.,19, 239 (1990).
M. A. Moinester:Proceedings of the Conference on the Intersections between Particle and Nuclear Physics, Tucson, Arizona, 1991, AIP Conf. Proc.,243, edited byW. Van Oers (1992), p. 553.
D. Babusci, S. Bellucci, G. Giordano andG. Matone:Phys. Lett. B,314, 112 (1993);Proceedings of the Workshop on Hadron Structure from Photo-Reactions at Intermediate Energies, Brookhaven National Laboratory, May 1992, edited byA. M. Nathan andA. M. Sandorfi, BNL Report, BNL 47972.
V. Bernard, B. Hiller andW. Weise:Phys. Lett. B,159, 85 (1988).
V. Bernard andD. Vautherin:Phys. Rev. D,40, 1615 (1989).
M. A. Ivanov andT. Mizutani:Phys. Rev. D,45, 1580 (1992).
D. Babusci, S. Bellucci, G. Giordano, G. Matone, A. M. Sandorfi andM. A. Moinester:Phys. Lett. B,277, 158 (1992).
J. Gasser andH. Leutwyler:Ann. Phys,158, 142 (1984).
J. Bijnens andF. Cornet:Nucl. Phys. B,296, 557 (1988).
J. F. Donoghue, B. R. Holstein andY. C. Lin:Phys. Rev. D,37, 2423 (1988).
J. Gasser andH. Leutwyler:Nucl. Phys. B,250, 465 (1985);J. F. Donoghue andB. R. Holstein:Phys. Rev. D,40, 2378 (1989).
P. Ko:Phys. Rev. D,41, 1531 (1990);J. Bijnens, S. Dawson andG. Valencia:Phys. Rev. D,44, 3555 (1991).
J. F. Donoghue, C. Ramirez andG. Valencia:Phys. Rev. D,39, 1947 (1989).
Particle Data Group:Phys. Rev. D,45, 1, part II (1992).
S. Bellucci: inThe DAΦNEPhysics Handbook, edited byL. Maiani, G. Pancheri andN. Paver (1992), p. 419.
MARK-IICollaboration (J. Boyer et al.):Phys. Rev. D,42, 1350 (1990).
Yu. M. Antipov et al.:Phys. Lett. B,121, 445 (1983);Yu. M. Antipov et al.:Z. Phys. C,26, 495 (1985).
PLUTOCollaboration (Ch. Berger et al.):Z. Phys. C,26, 199 (1984).
A. Courau et al.:Phys. Lett. B,96, 402 (1980);Nucl. Phys. D,271, 1 (1986).
Z. Ajaltouni et al.:Phys. Lett. B,194, 573 (1987).
T. A. Aibergenov et al.:Czech. J. Phys. B,36, 948 (1986).
Crystal Ball Collaboration (H. Marsiskie et al.):Phys. Rev. D,14, 3324 (1990).
M. R. Pennington: inThe DAΦNEPhysics Handbook, edited byL. Maiani, G. Pancheri andN. Paver (1992), p. 379.
S. Bellucci, J. Gasser andM. Sainio: Frascati preprint, LNF-93/077 (P) (1993).
J. F. Donoghue andB. R. Holstein:Phys. Rev. D,48, 137 (1993).
S. Bellucci andG. Colangelo:Phys. Rev. D,49, 1207 (1994).
D. Babusci, S. Bellucci, G. Giordano, G. Matone andM. Candusso: INFN Report KLOE-92/22.
A. Courau:Proceedings of the Frascati Workshop for Detectors and Physics at DAΦNE,Frascati, Italy, April 9–12 (1991), p. 373.
S. Ong andP. Kessler:Mod. Phys. Lett. A,2, 683 (1987);S. Ong, P. Kessler andA. Courau:Mod. Phys. Lett. A,4, 909 (1989).
S. Ong:Test of chiral loops and azimuthal correlations in the reaction γγ→π0π0, preprint LPC 9301 (1993), Laboratoire de Physique Corpuscolaire, Collège de France, Paris, France.
CELLOCollaboration (H. J. Behrend et al.):Z. Phys. C,49, 401 (1991).
Crystal Ball Collaboration (D. A. Williams et al.):Phys. Rev. D,38, 1365 (1988).
Ll. Ametller, J. Bijnens, A. Bramon andF. Cornet:Phys. Rev. D,45, 986 (1992);J. Bijnens, A. Bramon andF. Cornet:Phys. Rev. Lett.,61, 1453 (1988).
See,e.g.,G. Alexander:The BR(f0 (975) → K\(\bar K\))derivation and its value has recently been questioned, LNF-93/001(P).
A. Backer:Unfolding techniques, inProceedings of the VI International Workshop on Photon-Photon Collisions, Lake Tahoe, California, September 10–13, edited byR. L. Lander (World Sci. Pub., 1984), p. 205.
PLUTOCollaboration (Ch. Berger et al.):Phys. Lett. B,149, 421 (1984).
TPC/2γCollaboration (D. Bintinger et al.):Phys. Rev. Lett.,54, 763 (1985).
See,e.g.,G. Alexander:The γγ total cross-section and the photon structure function, inProceedings of the VII International Workshop on Photon-Photon Collisions, Paris, April 1986, edited byA. Courau andP. Kessler (World Sci. Pub.).
G. Alexander andU. Maor:Phys. Rev. D,46, 2882 (1992).
G. Alexander, U. Maor andC. Milstene:Phys. Lett. B,131, 224 (1983)
G. Alexander, A. Levy andU. Maor:Z. Phys. C,30, 65 (1986).
A. Levy:Phys. Lett. B,177, 106 (1986);181, 401 (1986).
G. Ecker: inProceedings of the Workshop Hadronic Matrix Elements and Weak Decay, Ringberg Castle, Germany, edited byA. J. Buras et al. (1988).
Ll. Ametller, J. Bijnens, A. Bramon andF. Cornet:Phys. Lett. B,276, 195 (1992).
P. Ko:Phys. Rev. D,47, 3933 (1993).
F. Anulli et al.: inThe DAΦNEPhysics Handbook, edited byG. Pancheri andN. Paver (Laboratori Nazionali di Frascati, 1992), p. 435.
V. N. Baier et al.:Phys. Rep.,78, 293 (1981);G. Pancheri:Estimate of small angle radiative Bhabha scattering at DAΦNE, LNF-93/024(P);M. Greco et al.:Phys. Lett. B,318, 635 (1993).
H. C. Dehne, M. Preger, S. Tazzari andG. Vignola:Nucl. Instrum. Methods,116, 345 (1974).
M. Preger, A. Antonelli et al.:Phys. Lett. B,301, 317 (1993).
S. Bianco et al.:Lead-scintillating fibers calorimetry for low energy photons, presented byS. Sarwar at theIII International Conference on Calorimetry in High Energy Physics, September 29–October 2, 1992, Corpus Christi, Texas, USA, edited byP. Hale ansJ. Siegrist (World Sci. Pub.).
D. Babusci et al.:Nucl. Instrum. Methods A,332, 444 (1993).
Proposal to study Lead Fluoride as a potential High Resolution Electromagnetic Calorimeter for RHIC, BNL-Oak Ridge, October 1991.
C. L. Woody et al.:IEEE Trans. Nucl. Sci., NS-40, 543 (1993).
D. F. Anderson et al.:Nucl. Instrum. Methods A,290, 385 (1990).
G. Colangelo, S. Dubnička andM. Greco:Radiative corrections at DAΦNE, inThe DAΦNEPhysics Handbook, edited byL. Maiani, G. Pancheri andN. Paver (Laboratory Nazionali di Frascati, 1992), p. 327.
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Alexander, G., Anulli, F., Babusci, D. et al. Two-photon physics capabilities of KLOE at DAΦNE. Nuov Cim A 107, 837–861 (1994). https://doi.org/10.1007/BF02731100
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DOI: https://doi.org/10.1007/BF02731100