Normal seminar coordinates :

** Wed 2-3pm, Moseley Lecture Theatre **

Wed 09 Feb | Prof Terry Wyatt (Manchester) | Schuster Colloquium |

Thur 17 Feb, 5:00-6:00 pm 5th Floor HEP Meeting Room |
Dr. E. Aguilo (Barcelona) |

Thur 24 Feb, 2-3 pm 2nd Floor Seminar Room |
Dr. A. Nomerotski (FNAL) |

Wed 02 Mar | Dr. E. Gardi (Cambridge) |

Wed 09 Mar | Dr. B. C. Allanach (DAMTP) |

Wed 16 Mar | Prof. Albert Ziljstra (Manchester) | Schuster Colloquium |

Wed 13 Apr | Dr. C. Touramanis (Liverpool) |

Wed 20 Apr | Dr. S. Cartwright (Sheffield) |

Wed 27 Apr | Prof. Niels Walet (Manchester) | Schuster Colloquium |

Wed 04 May | Dr. S. A. Abel (Durham, IPPP) |

Wed 11 May | Project reports of 1st year students (Ph.D & M.Sc) |

**17 Feb. E. Aguilo **:

LHCb is an experiment in construction dedicated to CP violation
in the B sector. The SPD (Scintillator Pad Detector) is a scintillator
tile plane in front of the LHCb electromagnetic calorimeter to
differentiate at first level trigger (L0) between electrons and photons.
In this talk three Physics subjects related to the SPD will be introduced:
a pulseshape simulation of the detector, a study for the optimisation of
the L0 trigger and an analysis to improve the $B_d \to J/\psi (e^+e^-)
K_S$ channel reconstructed measurements.

**24 Feb. A. Nomerotski **:

Since its discovery in 1977 the bottom quark played a prominent role
in the Standard Model of elementary particles due to its heaviness and
long lifetime. These unique features allowed to develop special
approaches to study its properties both in theory and experimental
techniques. The talk will review new results on B-physics from the
DZero detector at Fermilab. The emphasis will be done on the lifetime
and oscillation measurements which require precision tracking with
silicon detectors.

**02 Mar. E. Gardi **:

We show that the B \to X(s) gamma photon energy (E_gamma)
spectrum can be reliably computed by resummed perturbation theory. Our
calculation is based on Dressed Gluon Exponentiation (DGE) incorporating
Sudakov and renormalon resummation. It is shown that the resummed
spectrum does not have the perturbative support properties: it smoothly
extends to the non-perturbative region E_gamma > m/2, where m is the
quark pole mass, and tends to zero near the physical endpoint. The
calculation of the Sudakov factor, which determines the shape of the
spectrum in the peak region, as well as that of the pole mass, which
sets the energy scale, are performed using Principal-Value Borel
summation. By using the same prescription in both, the cancellation of
the leading renormalon ambiguity is respected. Furthermore, in computing
the Sudakov exponent we go beyond the formal next-to-next-to-leading
logarithmic accuracy using the large-order asymptotic behavior of the
series, which is accurately determined from the relation with the pole
mass. Upon matching the resummed result with the next-to-leading order
expression we compute the spectrum, obtain its moments as a function of
a minimum photon energy cut, analyze sources of uncertainty and show
that our predictions are in good agreement with Belle data.

**09 Mar. B. Allanach **:

If future colliders discover supersymmetric particles and probe their properties, one could predict the dark matter density of the Universe and would constrain cosmology with the help of precision data provided by WMAP and PLANCK. We investigate how well the relic density can be predicted in minimal supergravity (mSUGRA), with and without the assumption of mSUGRA when analysing data. We determine the parameters to which the relic density is most sensitive, and quantify the collider accuracy needed. Theoretical errors in the prediction are investigated in some detail.

**20 Apr. S. Cartwright **:

Over the past 40 years, Nobel Prize-winning experiments have demonstrated
that electron neutrinos produced in solar fusion can transform into
another type before they reach Earth, and that the two heavier mass
eigenstates are essentially a 50:50 mix of mu and tau neutrinos. That
leaves one mixing angle unaccounted for - does the electron neutrino mix
to the heavier of the two other states? This apparently minor question
may hold the key to one of the longest-standing problems of particle
cosmology: why the universe is made of matter and not antimatter.
The T2K experiment in Japan is a next-generation long baseline oscillation
experiment, which aims to investigate the third mixing angle and possibly
to shed some light on the matter/antimatter asymmetry of the universe. I
will talk about neutrinos and their oscillations, the concept and aims of
the T2K experiment and its design challenges, and the physics prospects
when the project turns on in 2009.

**04 May. S. A. Abel **:

D-branes are a useful tool for examining the properties
of theories with extra dimensions, with the added convenience
of renormalisability and UV finiteness. In this talk I
discuss some of the questions that can be addressed in this
formalism including power law running and FCNCs.