Higgs boson exchange effects inl+l−→W+W−at high energy

Abstract

We consider the prospects for detecting effects due to the Higgs exchange diagram in high energy µ + µ − , e + e − , and τ + τ − collisions producing a pair of W bosons. The processes l + l − → W + W − (with l = µ, e, τ ) are analyzed, analytically and via numerical simulations, to determine the center of mass energy, √ s H , where the effects from Higgs exchange become relevant. The scaling of √ s H with the mass of the incoming leptons is also studied. Special consideration is given to the W + W − → l ± ν l jj final state after experimental acceptance cuts are imposed. Angular cuts are shown to be able to significantly lower √ s H .

Microstructure of ZnO‐Li2CO3 compound studied by positron annihilation spectroscopy

“…However, this lifetime of 181 ps is still longer than the positron bulk lifetime for ZnO grown by other methods [24,28]. It is also higher than the theoretical value [29,44]. Probably there are still some unknown defects or impurities which trap positrons.…”

“…Positron annihilation spectroscopy (PAS) is a powerful tool in the search for neutral and negatively charged open volume defects in semiconductors [23]. In recent years it has been extensively utilized to study the vacancy defects in ZnO [24][25][26][27][28][29][30][31][32]. Zn vacancies can be clearly recognized by positrons, while O vacancies are invisible to positrons [24,27].…”

“…The most remarkable difference occurs in the hydrothermal grown ZnO, in which the positron lifetime has an increase of at least 10-15 ps compared to samples produced by other growth techniques. Such difference was suggested to be due to the positron trapping by hydrogen decorated Zn vacancies in hydrothermal grown ZnO [28,29]. It was also ascribed to the positron trapping by Li Zn , which was proven to increase positron lifetime in Li-rich ZnO compared with other Li-lean material [31].…”

“…In the undoped and (ZnO) 0.85 (Li 2 CO 3 ) 0.075 samples, there are two positron lifetime components. t 1 is around 200 ps, which is higher than the positron bulk lifetime in ZnO [24,27,29]. It is known that in ZnO only Zn vacancies are visible to positron [24,27], and the positron lifetime in Zn monovacancy is about 230 ps [25,27].…”

Impact of Extreme Physical Exercise on Human Body

“…There are documented many metabolic, endocrine and immune changes during physical exercise [7,8]. The spectrum of changes and the organism response depends both on individual training and type of physical stress [9,10].…”