Author
Robert N. Cahn
Bio: Robert N. Cahn is an academic researcher from CERN. The author has contributed to research in topics: Elastic scattering & Collider. The author has an hindex of 3, co-authored 3 publications receiving 45 citations.
Papers
More filters
TL;DR: An analysis of total cross sections and ratios of real to imaginary parts of the forward hadronic scattering amplitude for pp andu¯p is given in this paper, where the data above s = 25GeV 2, including the latest p¯p results from the ISR, are simultaneously fit for both real and imaginary parts using proper analytic forms.
34 citations
TL;DR: In this article, an analysis of nuclear slope parameters bp pandbp¯ p, evaluated at low |t| as a function of s, is given, using t = 0 amplitudes found in a previous communication, and analyse elastic scattering data in the low | t| region for both p p andp¯ p reactions, in terms of even and odd hadronic slope parameters, parametrized as b+ = C+ + D+lns + E+ln2sandb− = C− + D−lns.
14 citations
TL;DR: The apparent paradox arising from Martin's bound B(s, t) < C 1n s at nearly fixed t was explained in this paper, where it was shown that if the elastic pp total cross section grows as 1n2 s, then so does the slope parameter B, measured inside the diffraction region.
3 citations
Cited by
More filters
TL;DR: In this paper, the primordial abundances of the hadronic decay modes of X were derived using the JETSET 7.4 Monte Carlo event generator, which is used to calculate the spectrum of hadrons produced by the decay of X. In order to estimate the uncertainties, the Monte Carlo simulation which includes the experimental errors of the cross sections and transfered energies.
Abstract: We study the big-bang nucleosynthesis (BBN) with the long-lived exotic particle, called X. If the lifetime of X is longer than \sim 0.1 sec, its decay may cause non-thermal nuclear reactions during or after the BBN, altering the predictions of the standard BBN scenario. We pay particular attention to its hadronic decay modes and calculate the primordial abundances of the light elements. Using the result, we derive constraints on the primordial abundance of X. Compared to the previous studies, we have improved the following points in our analysis: The JETSET 7.4 Monte Carlo event generator is used to calculate the spectrum of hadrons produced by the decay of X; The evolution of the hadronic shower is studied taking account of the details of the energy-loss processes of the nuclei in the thermal bath; We have used the most recent observational constraints on the primordial abundances of the light elements; In order to estimate the uncertainties, we have performed the Monte Carlo simulation which includes the experimental errors of the cross sections and transfered energies. We will see that the non-thermal productions of D, He3, He4 and Li6 provide stringent upper bounds on the primordial abundance of late-decaying particle, in particular when the hadronic branching ratio of X is sizable. We apply our results to the gravitino problem, and obtain upper bound on the reheating temperature after inflation.
840 citations
TL;DR: In this article, high-energy elastic and inelastic scattering at small t are discussed in terms of pomeron and double-pomeron exchange and the similarity between them allows an almost parameter-free description of various elastic process, a and diffraction dissociation, in good agreement with experiment.
333 citations
TL;DR: In this article, the interference of the Coulomb scattering and the hadronic scattering was measured and the ratio of the real-to-imaginary part of the forward hadronic amplitude was determined.
123 citations
TL;DR: In this article, the authors used the form exp (bt ) with b = 17.1 ± 1.18 GeV su 2 and b = 13.7 ± 0.2 GeV −2 for | t | = 0.21−0.04 t 2.
89 citations
TL;DR: In this paper, the authors measured the differential cross section for pp and pp elastic scattering at √s = 31, 53 and 62 GeV in the interval 0.05 < |t| < 0.85 GeV2 at the CERN ISR using the Split Field Magnet detector.
76 citations