1,054 research outputs found
Perturbative gauge invariance: electroweak theory II
A recent construction of the electroweak theory, based on perturbative
quantum gauge invariance alone, is extended to the case of more generations of
fermions with arbitrary mixing. The conditions implied by second order gauge
invariance lead to an isolated solution for the fermionic couplings in
agreement with the standard model. Third order gauge invariance determines the
Higgs potential. The resulting massive gauge theory is manifestly gauge
invariant, after construction.Comment: 16 pages, latex, no figure
Mergers and acquisitions : an Oil & Gas Equipment Sector case study Siemens' acquisition of Dresser-Rand
In September 2014, the German engineering and manufacturing company Siemens
announced the plan to acquire the American manufacturer of oil and gas equipment and
service provider, Dresser-Rand for 68 is at the upper valuation range of 88.1
Additional revenues and reduced costs, ex transaction and implementation costs are
worth 458 million and may add synergies of 6 a share to the
standalone value of Dresser-Rand.
Despite the fact that Dresser-Rand fits into Siemens’ Power and Gas division from a
strategic point of view and that the M&A sentiment is currently beneficial to tap into the
M&A market, an acquisition price of 47 to $73.2
This case study shows that the world of M&A is fascinating, but also complex. Bid-prices
and valuations often substantially diverge – depending on the strategic fit and potential
synergies. The thesis mentions shareholder pressure, unsuccessful recent acquisition
activities, legal & technological burden, high cash balances and personal interests as
reasons for Siemens’ high premium
Gauge Independence of the S-Matrix in the Causal Approach
The gauge dependence of the time-ordered products for Yang-Mills theories is
analysed in perturbation theory by means of the causal method of Epstein and
Glaser together with perturbative gauge invariance. This approach allows a
simple inductive proof of the gauge independence of the physical S-matrix.Comment: 19 pages, latex, 1 figur
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