5,047 research outputs found
On A Model-independent Representation For The Real Part Of The Elastic Hadron Amplitude
No full textThe applicability of Martin's Real Part Formula in model-independent analysis of elastic proton-proton scattering is discussed. Good reproduction of all the differential cross section data at high-energies (19.4-62.5 GeV) is obtained through an empirical parametrization for the imaginary part of the amplitude and the use of a representation for the Martin's formula without the scaling property. According to the fit results, the scattering amplitude is predominantly imaginary, except at the dip region. One zero (change of sign) is observed in the imaginary part of the amplitude (dip region) and two zeros in the real part (at small and intermediate values of the momentum transfer). © 2010 American Institute of Physics.1296282285Fiore, R., (2009) Int. J. Mod. Phys. A, 24, p. 2551Ávila, R.F., Menon, M.J., (2008) Eur. Phys. J. C, 54, p. 555Martin, A., (1973) Lett. Nuovo Cim., 7, p. 811Ávila, R.F., Fagundes, D.A., Menon, M.J., Silva, G.L.P., (2009) XXI Reunião de Trabalho Sobre Interações Hadrônicas, , in pressD. A. Fagundes,M. J. Menon, G. L. P. Silva, this proceedingsAuberson, G., Kinoshita, T., Martin, A., (1971) Phys. Rev. D, 3, p. 318
Preliminary results on the empirical applicability of the Tsallis distribution in elastic hadron scattering
No full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)We show that the proton-proton elastic differential cross section data at dip position and beyond can be quite well described by a parametrization based on the Tsallis distribution, with only five free fit parameters. Extrapolation of the results obtained at 7 TeV to large momentum transfer, suggests that hadrons may not behave as a black-disk at the asymptotic energy region. © 2013 American Institute of Physics.1520300302CNPq,CAPES,CLAF,FAPESP,FAPERJFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Kašpar, J., Kundrát, V., Lokajíček, M., Procházka, J., (2011) Nucl. Phys. B, 843, p. 84Fiore, R., (2009) Int. J. Mod. Phys. A, 24, p. 2551Matthiae, G., (1994) Rep. Prog. Phys., 57, p. 743Fagundes, D.A., Menon, M.J., (2011) Int. J. Mod. Phys. A, 26, p. 3219Fagundes, D.A., Menon, M.J., Silva, G.L.P., (2011) Eur. Phys. J. C, 71, p. 1637Ávila, R.F., Menon, M.J., (2008) Eur. Phys. J. C, 54, p. 555Carvalho, P.A.S., Martini, A.F., Menon, M.J., (2005) Eur. Phys. J. C, 39, p. 359Carvalho, P.A.S., Menon, M.J., (1997) Phys. Rev. D, 56, p. 7321Antchev, G., (2011) Europhys. Lett., 95, p. 41001. , TOTEM CollaborationAntchev, G., (2011) Europhys. Lett., 96, p. 21002. , TOTEM CollaborationTsallis, C., (1988) J. Statist. Phys., 52, p. 479Wilk, G., Włodarczyk, Z., (2009) Eur. Phys. J. A, 40, p. 299(2009) Phys. Rev. C, 79, p. 54903(2012) J. Phys. G, 39, p. 025006. , J. Cleymans and D. Worku, arXiv:1203.4343 [hep-ph]De, B., Sau, G., Biswas, S.K., Bhattacharyya, S., Guptaron, P., (2010) Int. J. Mod. Phys. A, 25, p. 1239Islam, M.M., Kašpar, J., Luddy, R.J., (2009) Mod. Phys. Lett. A, 24, p. 48
Differential Operators For Scattering Amplitudes
No full textWe discuss novel dispersion relations in differential form, connecting real and imaginary parts of elastic scattering amplitudes and formally valid at any energy above the physical threshold. By means of fits to total cross section data from proton-proton and antiproton-proton scattering, we evaluate the corresponding ratio p between the real and imaginary parts of the forward amplitudes. We show that the results are exactly the same as those obtained through standard integral dispersion relations. © World Scientific Publishing Company.16929102914Goldberger, M.L., Nambu, Y., Oehme, R., (1957) Ann. Phys, 2, p. 226Söding, P., (1964) Phys. Lett, 8, p. 285Block, M.M., Cahn, R.N., (1985) Rev. Mod. Phys, 57, p. 563Gribov, N.V., Migdal, A.A., (1968) Yad. Fiz, 8, p. 1002Sov, J., (1969), 8, p. 583. , Nucl PhysBronzan, J.B., Kane, G.L., Sukhatme, U.P., (1974) Phys. Lett. B, 49, p. 272Ávila, R.F., Menon, M.J., (2004) Nucl. Phys. A, 744, p. 249Ávila, R.F., Menon, M.J., (2007) Braz. J. Phys, 37, p. 358. , hep-ph/0512166;in Sense of Beauty in Physics - A in Honour of Adriano Di Giacomo, eds. M. D'Elia, K. Konishi, E. Meggiolaro and P. Rossi (Edizioni Plus, Pisa, University Press, Pisa, 2006), p. 153, hep-ph/0601194Yao, W.-M., (2006) J. Phys. G, 33, p. 1Cudell, J.R., Martynov, E., Selyugin, O., hep-ph/030725
An Updated Analysis On The Rise Of The Hadronic Total Cross-section At The Lhc Energy Region
No full textA forward amplitude analysis on pp and elastic scattering above 5 GeV is presented. The dataset includes the recent high-precision TOTEM measurements of the pp total and elastic (integrated) cross-sections at 7 TeV and 8 TeV. Following previous works, the leading high-energy contribution for the total cross-section (σtot) is parametrized as lnγ(s/sh), where γ and s h are free real fit parameters. Singly-subtracted derivative dispersion relations are used to connect σtot and the rho parameter (ρ) in an analytical way. Different fit procedures are considered, including individual fits to σtot data, global fits to σtot and ρ data, constrained and unconstrained data reductions. The results favor a rise of the σtot faster than the log-squared bound by Froissart and Martin at the LHC energy region. The parametrization for σtot is extended to fit the elastic cross-section (σel) data with satisfactory results. The analysis indicates an asymptotic ratio σel/σ tot consistent with 1/3 (as already obtained in a previous work). A critical discussion on the correlation, practical role and physical implications of the parameters γ and sh is presented. The discussion confronts the 2002 prediction of σtot by the COMPETE Collaboration and the recent result by the Particle Data Group (2012 edition of the Review of Particle Physics). Some conjectures on possible implications of a fast rise of the proton-proton total cross-section at the highest energies are also presented. © 2013 World Scientific Publishing Company.2820Froissart, M., (1961) Phys. Rev., 123, p. 1053Martin, A., (1966) Nuovo Cimento A, 42, p. 930Martin, A., (1966) Nuovo Cimento A, 44, p. 1219Lukaszuk, L., Martin, A., (1967) Nuovo Cimento A, 52, p. 122Azimov, Ya.I., (2011) Phys. Rev. D, 84, p. 056012Azimov, Ya.I., Froissart Bounds for Amplitudes and Cross-sections at High Energies, , arXiv:1204.0984 [hep-ph]Azimov, Ya., What Is the Real Meaning of the Froissart Theorem?, , arXiv:1208.4304 [hep-ph]Cudell, J.R., (2002) Phys. Rev. D, 65, p. 074024. , COMPETE CollabCudell, J.R., (2002) Phys. Rev. Lett., 89, p. 201801. , COMPETE CollabIgi, K., Ishida, M., (2002) Phys. Rev. D, 66, p. 034023Igi, K., Ishida, M., (2005) Phys. Lett. B, 622, p. 286Block, M.M., Halzen, F., (2004) Phys. Rev. D, 70, p. 091901Block, M.M., Halzen, F., (2005) Phys. Rev. D, 72, p. 036006Nakamura, K., (2010) J. Phys. G: Nucl. Part. Phys., 37, p. 075021. , Particle Data GroupAntchev, G., (2011) Europhys. Lett., 95, p. 41001. , TOTEM CollabAntchev, G., (2011) Europhys. Lett., 96, p. 21002. , TOTEM CollabAntchev, G., (2012) Europhys. Lett., 98, p. 31002. , TOTEM CollabBeringer, J., (2012) Phys. Rev. D, 86, p. 010001. , http://pdg.lbl.gov, Particle Data GroupFagundes, D.A., Menon, M.J., Silva, P.V.R.G., (2012) Braz. J. Phys., 42, p. 452. , arXiv:1112.4704 [hep-ph]Fagundes, D.A., Menon, M.J., Silva, P.V.R.G., (2013) J. Phys. G: Nucl. Part. Phys., 40, p. 065005. , arXiv:1208.3456 [hep-ph]Amaldi, U., (1977) Phys. Lett. B, 66, p. 390Antchev, G., (2013) Europhys. Lett., 101, p. 21002. , TOTEM CollabAntchev, G., (2013) Europhys. Lett., 101, p. 21004. , TOTEM CollabAntchev, G., (2013) Phys. Rev. Lett., 111, p. 012001. , TOTEM CollabAugier, C., (1993) Phys. Lett. B, 315, p. 503. , UA4/2 CollabKang, K., Nicolescu, B., (1975) Phys. Rev. D, 11, p. 2461Avila, R.F., Menon, M.J., (2004) Nucl. Phys. A, 744, p. 249Bevington, P.R., Robinson, D.K., (1992) Data Reduction and Error Analysis for the Physical Sciences, , 2nd edn. McGraw-Hill, Boston, MassachusettsFagundes, D.A., Menon, M.J., Silva, P.V.R.G., Reply to "Commentary on Total Hadronic Cross-section Data and the Froissart-Martin Bound by Fagundes, Menon and Silva, , arXiv:1211.3352 [hep-ph]Avila, R.F., Luna, E.G.S., Menon, M.J., (2001) Braz. J. Phys., 31, p. 567Avila, R.F., Luna, E.G.S., Menon, M.J., (2003) Phys. Rev. D, 67, p. 054020ROOT Framework, , http://root.cern.ch/drupal/, http://root.cern.ch/root/html/TMinuit.htmlJames, F., (1998) MINUIT Function Minimization and Error Analysis, Reference Manual, Version 94.1, , CERN Program Library Long Writeup D506 (CERN, Geneva, Switzerland)Common, A.K., (1970) Nuovo Cimento, 69, p. 115Abreu, P., (2012) Phys. Rev. Lett., 109, p. 062002. , The Pierre Auger CollabBarone, V., Predazzi, E., (2002) High-Energy Particle Diffraction, , Spring-Verlag, BerlinDonnachie, S., Dosch, G., Landshoff, P.V., Natchmann, O., (2002) Pomeron Physics and QCD, , Cambridge University Press, CambridgeDonnachie, A., Landshoff, P.V., (1979) Z. Phys. C, 2, p. 55Donnachie, A., Landshoff, P.V., (1984) Nucl. Phys. B, 244, p. 322Block, M.M., Halzen, F., (2012) Phys. Rev. D, 86, p. 051504Pumplin, J., (1973) Phys. Rev. D, 8, p. 2899Sukhatme, U.P., Henyey, F.S., (1976) Nucl. Phys. B, 108, p. 317Grau, A., Pacetti, S., Pancheri, G., Srivastava, Y.S., (2012) Phys. Lett. B, 714, p. 70Donnachie, A., Landshoff, P.V., (1992) Phys. Lett. B, 296, p. 227Landshoff, P.V., (2009) Acta Phys. Pol. B, 40, p. 1967Landshoff, P.V., (2009) AIP Conf. Proc., 1105, p. 236. , arXiv:0811.0260 [hep-ph]Donnachie, A., Landshoff, P.V., Elastic Scattering at the LHC, , arXiv:1112.2485 [hep-ph]Kopeliovich, B.Z., Potashnikova, I.K., Povh, B., Predazzi, E., (2000) Phys. Rev. Lett., 85, p. 507Kopeliovich, B.Z., Potashnikova, I.K., Povh, B., (2012) Phys. Rev. D, 86, pp. 051502RPetrov, V.A., Prokudin, A.V., (2002) Eur. Phys. J. C, 23, p. 135Petrov, V.A., Predazzi, E., Prokudin, A., (2003) Eur. Phys. J. C, 28, p. 525Petrov, V.A., Prokudin, A., Three Pomerons Vs DO and TOTEM Data, , arXiv:1212.1924 [hep-ph]Shaham, N., Piran, T., (2013) Phys. Rev. Lett., 110, p. 021101. , arXiv:1204.1488 [astroph. HE]Conceição, R., Deus De J.Dias, Pimenta, M., (2012) Nucl. Phys. A, 888, p. 58. , arXiv:1107.0912 [hep-ph]Menon, M.J., Silva, P.V.R.G., A Study on Analytic Parametrizations for the Proton-proton Cross-sections and Asymptotia, , arXiv:1305.2947 [hep-ph
Total Hadronic Cross Section And The Elastic Slope: An Almost Model-independent Connection
No full textAn almost model-independent parametrization for the ratio of the total cross section to the elastic slope, as function of the center of mass energy, is introduced. The analytical result is based on the approximate relation of this quantity with the ratio R of the elastic to total cross section and empirical fits to the R data from proton-proton scattering above 10 GeV, under the conditions of asymptotic unitarity and the black-disk limit. This parametrization may be useful in studies of extensive air showers and the determination of the proton-proton total cross section from proton-air production cross section in cosmic-ray experiments. © 2012 Elsevier B.V.880111Ulrich, R., Engel, R., Müller, S., Schüssler, F., Unger, M., (2009) Nucl. Phys. B (Proc. Suppl.), 196, p. 335Sokolsky, P., Introduction to Ultrahigh Energy Cosmic Ray Physics (1989) Frontiers in Physics, 76. , Addison-Wesley, New YorkEngel, R., Gaisser, T.K., Lipari, P., Stanev, T., (1998) Phys. Rev. D, 58, p. 014019Engel, R., (2000) Nucl. Phys. B (Proc. Suppl.), 82, p. 221Ávila, R.F., Luna, E.G.S., Menon, M.J., (2003) Phys. Rev. D, 67, p. 054020Glauber, R., (1955) Phys. Rev., 100, p. 629Glauber, R., Matthiae, G., (1970) Nucl. Phys. B, 21, p. 135Matthiae, G., (1994) Rep. Prog. Phys., 57, p. 743Cudell, J.R., (2002) Phys. Rev. Lett., 89 (20), p. 201801. , COMPETE CollaborationCudell, J.R., (2002) Phys. Rev. D, 65, p. 074024. , COMPETE CollaborationNakamura, K., (2010) J. Phys. G, 37, p. 075021. , Particle Data GroupAntchev, G., (2011) Europhys. Lett., 96, p. 21002. , TOTEM CollaborationMartini, A.F., Menon, M.J., Montanha, J., (2004) Braz. J. Phys., 34, p. 263Eden, R.J., (1971) Rev. Mod. Phys., 43, p. 15Froissart, M., (1961) Phys. Rev., 123, p. 1053Martin, A., (1966) Nuovo Cimento A, 42, p. 930Lukaszuk, L., Martin, A., (1967) Nuovo Cimento A, 52, p. 122MacDowell, S.W., Martin, A., (1964) Phys. Rev. B, 135, p. 960Block, M.M., (2006) Phys. Rep., 436, p. 71Block, M.M., Halzen, F., (2011) Phys. Rev. Lett., 107, p. 212002Chou, T.T., Yang, C.N., (1968) Phys. Rev. D, 170, p. 1591Bourrely, C., Soffer, J., Wu, T.T., (1984) Nucl. Phys. B, 247, p. 15Bourrely, C., Soffer, J., Wu, T.T., (1987) Z. Phys. C, 37, p. 369Troshin, S.M., Tyurin, N.E., (2007) Int. J. Mod. Phys. A, 22, p. 4437Troshin, S.M., Tyurin, N.E., (1993) Phys. Lett. B, 316, p. 175http://root.cern.ch/drupal/, URL:http://root.cern.ch/root/html/TMinuit.htmlBevington, P.R., Robinson, D.K., (1992) Data Reduction and Error Analysis for the Physical Sciences, , McGraw-Hill, Boston, Massachusettshttp://durpdg.dur.ac.uk/HEPDATA/REAC, Durham Reaction DatabaseAzimov, Y.I., (2011) Phys. Rev. D, 84, p. 056012Fagundes, D.A., Menon, M.J., Silva, P.V.R.G., Total hadronic cross section data and the Froissart-Martin bound, , arxiv:1112.4704Conceição, R., Dias de Deus, J., Pimenta, M., Proton-proton cross-sections: The interplay between density and radius, , arxiv:1107.091
On The Rise Of Proton-proton Cross-sections At High Energies
No full textThe rise of total, elastic and inelastic hadronic cross sections at high energies is investigated by means of an analytical parametrization, with the exponent of the leading logarithm contribution as a free fit parameter. Using derivative dispersion relations with one subtraction, two different fits to proton-proton and antiproton-proton total cross section and ρ parameter data are developed, reproducing well the experimental information in the energy region 5 GeV-7 TeV. The parametrization for the total cross sections is then extended to fit the elastic (integrated) cross section data in the same energy region, with satisfactory results. From these empirical results we extract the energy dependence of several physical quantities: inelastic cross section, ratios elastic/total, inelastic/total cross sections, ratio total-cross-section/ elastic-slope, elastic slope and optical point. All data, fitted and predicted, are quite well described. We find a statistically consistent solution indicating: (1) an increase of the hadronic cross sections with the energy faster than the log-squared bound by Froissart and Martin; (2) asymptotic limits 1/3 and 2/3 for the ratios elastic/total and inelastic/total cross sections, respectively; a result in agreement with unitarity. These indications corroborate recent theoretical arguments by Azimov on the rise of the total cross section. © 2013 IOP Publishing Ltd.406Barone, V., Predazzi, E., (2002) High-Energy Particle Diffraction, , 10.1007/978-3-662-04724-8Donnachie, S., Dosch, G., Landshoff, P.V., Natchmann, O., (2002) Pomeron Physics and QCD, , 10.1017/CBO9780511534935Dremin, I.M., (2012) Elastic Scattering of HadronsKašpar, J., Kundrát, V., Lokajíček, M., Procházka, J., (2011) Nucl. Phys., 843 (1), p. 84. , 10.1016/j.nuclphysb.2010.09.020 0550-3213 BFiore, R., Jenkovszky, L., Orava, R., Predazzi, E., Prokudin, A., Selyugin, O., (2009) Int. J. Mod. 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Eikonal representation in the momentum-transfer space
No full textBy means of empirical fits to the differential cross section data on pp and pp elastic scattering, above 10 GeV (center-of-mass energy), we determine the eikonal in the momentum-transfer space (q2 - space). We make use of a numerical method and a novel semi-analytical method, through which the uncertainties from the fit parameters can be propagated up to the eikonal in the q2 - space. A systematic study of the effect of the experimental information at large values of the momentum transfer is developed and discussed in detail. We present statistical evidence that the imaginary part of the eikonal changes sign in the q2 - space and that the position of the zero decreases as the energy increases; after the position of the zero, the eikonal presents a minimum and then goes to zero through negative values. We discuss the applicability of our results in the phenomenological context, outlining some connections with nonperturbative QCD. 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Hadronic cross sections, elastic slope and physical bounds
No full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)An almost model-independent parametrization for the ratio of the total hadronic cross section to elastic slope is discussed. Its applicability in studies of asymptotia and analyses of extensive air shower in cosmic-ray physics is also outlined. © 2013 American Institute of Physics.1520297299CNPq,CAPES,CLAF,FAPESP,FAPERJFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)MacDowell, S.W., Martin, A., (1964) Phys. Rev. B, 135, p. 960Fagundes, D.A., Menon, M.J., (2012) Nucl. Phys. A, 880, p. 1Block, M.M., Halzen, F., (2011) Phys. Rev. Lett., 107, p. 212002Troshin, S.M., Tyurin, N.E., (2007) Int. J. Mod. Phys. A, 22, p. 4437(1993) Phys. Lett. B, 316, p. 175Beringer, J., (2012) Phys. Rev., D86, p. 010001. , Particle Data GroupDurham Reaction Database, , http://durpdg.dur.ac.ukAntchev, G., (2011) Europhys. Lett., 96, p. 21002. , TOTEM CollaborationSchegelsky, V.A., Ryskin, M.G., (2012) Phys. Rev. D, 85, p. 094029Abreu, P., Measurement of the proton-air cross-section at √s = 57 TeV with the Pierre Auger Observatory Phys. Rev. Lett., , The Pierre Auger Collaboration to be published i
Uniqueness Of Centaouro-type Events
No full textAnalysis to discriminate Centauro events from normal events is made without previous identification of secondary emitted particles. For this purpose their energy and derived quantities like distance from the center of momenta it were mainly used. As a result we found in a sample of (280+87) experimental events only 3 were compatible with 5 Centauro events, but none of them had a high content of hadrons, characteristic of Centauro events. With this result we are confident about the uniqueness of Centauro events, especially for two events that have vertex directly determined. Comparing with some interaction models features we depict a possible scenario to explain Centauro events.122197200Pancheri, G., Rubbia, C., (1984) Nucl. Phys., A418, p. 117Gaisser, T.K., Halzen, F., (1985) Phys. Rev. Lett., 54 (16), p. 1754(1989), p. 327. , B-J Collaboration, 41th Brazilian Society for Promotion of Science, Fortaleza-Ceará(1989) and 10th Brazilian National Meeting on Particle and Fields, Itatiaia-Rio de JaneiroAugusto, C.R.A., Barroso, S.L.C., Beggio, P.C., Carvalho, A.O., Menon, M.J., Navia, C.E., Oliveira, R., Shibuya, E.H., (2001), p. 1422. , (BRAZIL-JAPAN COLLABORATION OF CHACALTAYA EMULSION CHAMBER EXPERIMENT), Proc.27th ICR Hamburg, HE300Augusto, C.R.A., Barroso, S.L.C., Beggio, P.C., Carvalho, A.O., Menon, M.J., Navia, C.E., Oliveira, R., Shibuya, E.H., (2001), p. 1537. , (BRAZIL-JAPAN COLLABORATION OF CHACALTAYA EMULSION CHAMBER EXPERIMENT, Proc.27th ICR Hamburg, HE3.0
Vacuum Insulation Panels Applied in Building Constructions
No full textDue to sustainability and due to international treaties, it is desired and required to reduce greenhouse gas emissions drastically. One contributor to these emissions is the burning of fossil fuels for generating power and electricity to be used in and for buildings. Buildings and building-related processes are responsible for about 40% of the primary energy consumption in the European Union. More than half of this energy is applied for heating systems in dwellings and commercial buildings. The European Union therefore has laid down new energy performance requirements for buildings in the European Directive on the Energy Performance of Buildings. Moreover, a reduction of energy losses of buildings during their occupational phase is important for facilitating the implementation of sustainable energy sources in the built environment. Increasing the insulation value of the envelope of buildings may contribute to this reduction of primary energy use. Two strategies can be followed. The first strategy is to increase the thickness of the thermal insulation layer. Until recently, this strategy has primarily been adopted. If, however, German or Swiss Passivhaus standard is applied, the thickness of this insulation layer would increase to beyond 30 cm, resulting in very thick building enclosures. The second, more innovative, strategy for reducing energy losses through the building skin would be the application of more effective thermal insulators. One such more effective thermal insulator is a vacuum insulation panel, abbreviated as VIP. A VIP consists of an open-celled core material which is evacuated and then tightly sealed into a barrier envelope to maintain this vacuum. The vacuum inside the pores of the core material reduces the thermal conductivity of the product significantly, as a result of which the thickness of the insulation layer can be reduced to obtain a certain performance. This reduction of thickness is among the most promising features for large-scale application of VIPs in the building industry. However, integration of VIPs into buildings must be performed very meticulously for several reasons; first, due to its nature a VIP cannot be processed on site and needs careful planning in advance; second, it is very sensitive to mechanical damage thus requiring careful handling; third, thermal bridges along the panel’s edges reduce its performance; fourth, the composite system is highly subjected to aging. This dissertation therefore looks into many of these aspects, presents several calculation tools and shows how VIPs can be applied in façade panels, EPS insulation boards and as under-floor insulation. With the wide-spread proliferation of VIPs in buildings a more sustainable and healthy environment can then be achieved.Building TechnologyArchitectur
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