Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 715843.0, MPI für Physik / YB 2016
Evidence for a Energy-Invariant Edge' in Proton-Proton Scattering at Very High Energies
Authors:
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Physical Review D
Journal Abbrev.:Phys.Rev.D
Issue / Number:91
Start Page:011501
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:Accurate fits to $pp$ and $\\bar pp$ \\csss data up to Tevatron
energies, incorporating the constraints imposed by
analyticity and unitarity, successfully predict
the results of recent LHC and cosmic ray measurements, and suggest
that the \\csssn s approach a black disc limit
asymptotically. The approach to the limit is, however, very slow.
We present a simple geometric picture
which explains these features in a natural way. A \\bd of
supplemented by a soft edge' whose properties are invariant with
\\yyn. The constancy of the edge results in the prediction that the
quantity $(\\sigma^{TOT}-2\\sigma^{El})/\\surd\\sigma^{TOT}$
approaches a constant at high \\yyn. Using the existing fits, this
prediction appears to
be verified. The value of the limiting constant allows an estimate
of
the thickness of the edge, which turns out to be on the order of
$1\\,{\\rm fm}$. One thus arrives at a picture where the
proton-proton scattering at lower
\\yys is dominated by what becomes the edge, while at higher \\yys
it is dominated by the disc. The crossover between the two
regimes is only at
$\\surd s\\geq$ 10 TeV, accounting for the slow approach to
asymptotic behavior. Some questions as to the nature of the edge
are
discussed.
Classification / Thesaurus:Phenomenology of High Energy Physics
Comment of the Author/Creator:8 pages, 2 figures
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:
Identifiers:
 Full Text: You have privileges to view the following file(s): arxiv:1409.3196.pdf   Uploading file not finished...
 The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.