منابع مشابه
Elimination of ambiguities in ππ phase shifts using crossing symmetry
Roy’s equations, which incorporate crossing symmetry of the ππ scattering amplitudes, are used to resolve the present ambiguity between two solutions for the scalar-isoscalar phase shifts below 1 GeV. It is shown that the “down-flat” solution satisfies well Roy’s equations and consequently crossing symmetry while the other solution called “up-flat” does not and thus should be eliminated.
متن کاملPartial Cubes and Crossing Graphs
Partial cubes are defined as isometric subgraphs of hypercubes. For a partial cube G, its crossing graph G# is introduced as the graph whose vertices are the equivalence classes of the Djoković–Winkler relation Θ, two vertices being adjacent if they cross on a common cycle. It is shown that every graph is the crossing graph of some median graph and that a partial cube G is 2-connected if and on...
متن کاملThe Enumeration of Sequences with Restrictions on their Partial Sums
We examine sequences containing p “−t”s and pt+ r “+1”s, where p, t, and r are integers satisfying p > 0, t > 1 and pt+ r > 0. We develop a rotation method to enumerate the number of sequences meeting additional requirements related to their partial sums. We also define downcrossings about l and their downcrossing numbers, and obtain formulas for the number of sequences for which the sum of the...
متن کاملOn the effects of ( partial ) quenching on penguin contributions to K → ππ
Recently, we pointed out that chiral transformation properties of strong penguin operators change in the transition from unquenched to (partially) quenched QCD. As a consequence, new penguin-like operators appear in the (partially) quenched theory, along with new lowenergy constants, which should be interpreted as a quenching artifact. Here, we extend the analysis to the contribution of the new...
متن کاملNumerical time-step restrictions as a result of capillary waves
Article history: Received 26 August 2014 Received in revised form 9 January 2015 Accepted 14 January 2015 Available online 19 January 2015
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ژورنال
عنوان ژورنال: Il Nuovo Cimento A
سال: 1970
ISSN: 0369-3546,1826-9869
DOI: 10.1007/bf02824801