"Solemn seminar dedicated to the 70th anniversary of the birth of V.V. Uzhinskiy"

"Method for programming calculations in a hybrid cloud by the example of pairwise processing of data array elements"
Bobyleva Irina (Samara National Research University)
 

The report discusses the problem of the efficient use of a hybrid cloud in the context of a method for developing algorithms in a form that is convenient for execution on an arbitrary set of computing resources. The method is based on the joint application of Cole’s algorithmic skeletons and a variant of Hewitt’s actor model to describe many-task computing. The proposed method is investigated by the example of algorithms for pairwise processing of data arrays according to the principle of a round-robin tournament. Computational experiments demonstrate the effectiveness of software implementations of these algorithms on various types of modern computer architectures that represent hybrid cloud resources.

 

More information on the seminar and the link to connect via Webex are available at Indico.

"Measuring intact protons at the LHC: From the odderon discovery to the search for axion-like particles"

Prof. Christophe Royon (The University of Kansas, Lawrence, USA)

 

In the first part of the talk, we will describe the odderon discovery by the TOTEM and D0 experiments. The analysis compares the proton-antiproton elastic cross section as measured by the D0 Collaboration at a center-of-mass energy of 1.96 TeV to that in pp collisions as measured by the TOTEM Collaboration at 2.76, 7, 8, and 13 TeV. The two data sets disagree at the 3.4 sigma level and thus provide evidence for the t-channel exchange of a colorless, C-odd gluonic compound, also known as the odderon. We combine these results with a TOTEM analysis of the same C-odd exchange based on the total cross section and the ratio of the real to imaginary parts of the forward elastic strong interaction scattering amplitude in pp scattering, leading to a combined significance larger than 5 sigma. In a second part of the talk, we will describe the perspective on the search for quartic anomalous couplings and axion-like particles using tagged protons in the final state, leading to sensitivities to beyond standard model physics that improve by 2 to 3 orders of magnitude on the coupling. We will finish by describing briefly the ultra fast silicon detectors for timing measurements as well as for medical and cosmic ray physics applications.