Search

The LHCf experiment has taken data in 2009 and 2010 p-p collisions at LHC at √s = 0.9 TeV and √s = 7 TeV. The measurement of the forward neutral particle spectra produced in proton-proton collisions at LHC up to an energy of 14 TeV in the center of mass system are of fundamental importance to calibrate the Monte Carlo models widely used in the high energy cosmic ray (HECR) field, up to an equivalent laboratory energy of the order of 1017 eV. In this paper the first results on the inclusive photon spectrum measured by LHCf is reported. Comparison of this spectrum with the model expectations show significant discrepancies, mainly in the high energy region. In addition, perspectives for future analyses as well as the program for the next data taking period, in particular the possibility to take data in p-Pb collisions, will be discussed. [ABSTRACT FROM AUTHOR]

The interest to the rare radiative decays of the B-mesons at LHCb is mostly aroused due to the measurement of the photon polarization in the Bs0 → Φγ decay, which may provide a sensitive probe for the Standard Model. The LHCb experiment has started to take data at the energy of √s = 7 TeV in 2010 and the current paper presents the result of the studies of the two rare radiative decays B0 → K*γ and Bs0 → Φγ with 340pb-1 of data taken in the first half of 2011. With this data we have a preliminary measurement of BR(B0 → K*γ)/BR(Bs0 → Φγ) = 1.52 ± 0.14(stat.) ± 0.10(syst.) ± 0.12( fs/ fd) and assuming the measured value of B(B0 → K* γ) = (4.33 ± 0.15) x 10-5 we infer B(Bs0 → Φγ) = (2.8 ± 0.5) x 10-5 [1]. [ABSTRACT FROM AUTHOR]