We report what is to our knowledge a record high value for an intrinsic two-photon absorption (TPA) cross section, sigma(2) = 11 x 10(-47)> cm>(4)> s photon(-1) molecule(-1), measured with femtosecond pulses in a new dendrimer molecule comprising 29 repeat units of 4, 4(?)-bis(diphenylamino)stilbene chromophore. We measure the dependence of TPA on excitation wavelength in three consecutive gene...

13 An 80 mm long polarizing S-bender with a large cross section of 30 mm x 100 mm for the 14 instrument MIRA at the FRM II has been simulated, built and tested. The results of the 15 experiment show for the wavelength of 4.4 Å a homogenous polarization of more than 98% 16 across the bender cross section and a high transmission of above 65% of the spin up 17 component of the neutron beam. The be...

Hadronic tau decays play a crucial role in Standard Model measurements as well 6 as in the search for physics beyond the Standard Model by the ATLAS experiment at the Large 7 Hadron Collider (LHC). However, hadronic tau decays are difficult to identify and trigger on due 8 to their resemblance to QCD jets. Given the large production cross section of QCD processes, 9 designing and operating a tr...

The twin Higgs mechanism has recently been proposed to solve the little hierarchy problem. In the context of the Left-Right twin Higgs(LRTH) model, we discuss single production of the new charged gauge boson W H , which is predicted by the left-right twin Higgs model, in association with top quark at the CERN Large Hadron Collider(LHC). It is found that, for a typical nonzero value of mass mixi...

An analysis of soft breaking under the constraint of modular invariance is given. The role of dilaton and moduli dependent front factors in achieving a modular invariant Vsoft is emphasized. Further, it is shown that in string models tan β is no longer a free parameter but is determined in terms of αstring and the other soft parameters by the constraints of modular invariance and radiative elec...

We consider QCD tt̄γ and tt̄Z production at hadron colliders as a tool to measure the ttγ and ttZ couplings. At the Tevatron it may be possible to perform a first, albeit not very precise, test of the ttγ vector and axial vector couplings in tt̄γ production, provided that more than 5 fb−1 of integrated luminosity are accumulated. The tt̄Z cross section at the Tevatron is too small to be observable....

We present an analysis of the production and two-photon decay of the lightest CP-even Higgs boson of the Minimal Supersymmetric Standard Model (MSSM) at the Large Hadron Collider (LHC). A rather general model is considered, without supergravity constraints. All parameters of the model are taken into account, we especially study the dependence of the cross section on the squark masses, on the bi...

We investigate the observability of the lightest Higgs boson in the gluon–fusion channel at the CERN Large Hadron Collider (LHC) in the minimal supersymmetric Standard Model with explicit CP–violating mixing among three neutral Higgs bosons. The lightest Higgs boson with its mass less than 130 GeV can be detected at the LHC via its gluon–fusion production followed by the decay into two photons....

Since the discovery of the Schwarzschild solution [1], black holes have fired mans imagination. Even more since it has been pointed out that, according to the theories with large extra dimensions (LXDs) [2] black holes (BHs) might even be produced at the Large Hadron Collider (LHC)[3]. We review possible observables of this conjecture with special emphasis on the unclear final fate of such a BH...

In this paper we present two measurements : the measurement of the differential cross section for the inclusive production of isolated prompt photons [1], and the measurement of the production of pairs of prompt isolated photons [2] in proton-proton collisions at a centre-of-mass energy of 7 TeV with the Compact Muon Sollenoid (CMS) detector at the Large Hadron Collider (LHC). A data sample cor...