The soft and the hard pomerons: elastic scattering and unitarisation
نویسندگان
چکیده
The hard pomeron component needed to reproduce small-x data seems to be present in elastic scattering at moderate energy. If this is the case, it is likely that the total cross section at the LHC will be appreciably larger than previously expected. 1 The effective trajectory Historically, hadronic exchanges have been remarkably well described by the simple-pole model of Donnachie and Landshoff [1], which assumes that, at high energy, the hadronic amplitude is dominated by a simple-pole pomeron:
منابع مشابه
ar X iv : h ep - p h / 05 11 07 3 v 1 7 N ov 2 00 5 The soft and the hard pomerons in hadron elastic scattering at small t
We consider simple-pole descriptions of soft elastic scattering for pp, p̄p, πp and Kp. We work at t and s small enough for rescatterings to be neglected, and allow for the presence of a hard pomeron. After building and discussing an exhaustive dataset, we show that simple poles provide an excellent description of the data in the region −0.5 GeV2 ≤ t ≤ −0.1 GeV2, 6 GeV≤ √s ≤ 63 GeV. We show that...
متن کاملar X iv : h ep - p h / 05 11 07 3 v 2 30 M ar 2 00 6 The soft and the hard pomerons in hadron elastic scattering at small t
We consider simple-pole descriptions of soft elastic scattering for pp, p̄p, πp and Kp. We work at t and s small enough for rescatterings to be neglected, and allow for the presence of a hard pomeron. After building and discussing an exhaustive dataset, we show that simple poles provide an excellent description of the data in the region −0.5 GeV2 ≤ t ≤ −0.1 GeV2, 6 GeV≤ √s ≤ 63 GeV. We show that...
متن کاملar X iv : h ep - p h / 05 09 30 8 v 1 2 7 Se p 20 05 ELASTIC MESON - NUCLEON AND NUCLEON - NUCLEON SCATTERING : MODELS vs . ALL AVAILABLE DATA
We consider simple-pole descriptions of soft elastic scattering at small t and s, and allow for the presence of a hard pomeron. We have built and analyzed an exhaustive dataset and we show that simple poles provide an excellent description of the data in the region −0.5 GeV 2 < t < −0.1 GeV 2 , 6 GeV< √ s <63 GeV. We show that new form factors have to be used, and get information on the traject...
متن کاملThe spin-flip amplitude in the impact-parameter representation
The impact-parameter representation of the spin-flip amplitude of hadron elastic scattering is examined in different unitarisation schemes, taking the Born term of the spin-flip amplitude from the Dubna Dynamical Model (DDM). It is shown that the basic properties of the unitarisation schemes are independent of the functional form used for unitarisation but heavily depend on the asymptotic value...
متن کاملA Review of the Soft Pomeron a 2 Deep Inelastic Scattering
Soft pomeron fits reproduce all zero-Q 2 data for light quarks, but run into problems at HERA for heavy mesons and for high Q 2 , and at the Tevatron for W diffractive production. I review the basic properties of the soft pomeron, and outline the possibilities which have been considered to account for the new data. At high energy, pomeron exchange controls total cross sections, single-and doubl...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008