Starting from the old idea that Fermi statistics for quarks play a fundamental role to explain some features of hadron structure, we study the modification of the scaling behaviour of parton distributions due to quantum statistical effects. In particular, by following an interesting formal analogy which holds between the Altarelli-Parisi evolution equations, in leading-log approximation, and a ...

so we take the incoming and the outgoing electrons to be on-shell, p2 = p′2 = m2, but the photon is off-shell, q2 6= 0. Moreover, we put the vertex in the context of the complete electron line — including the external line factors, thus ū(p′)× ieΓμ × u(p). As discussed in class, this simplifies the Lorentz and Dirac structure of the vertex and allows us to write it as Γ(p, p) = Fel(q )× (p′ + p...

We illustrate how the measurements of the CP asymmetries in B d,s-decays together with a measurement of Br(KL → πνν̄) or Br(K → πνν̄) and the known value of | Vus | can determine all elements of the Cabibbo-Kobayashi-Maskawamatrix essentially without any hadronic uncertainties. An analysis using the ratio xd/xs of Bd − B̄d to Bs − B̄s mixings is also presented. 1. Setting the Scene An important tar...

We investigate how Drell-Yan processes can be used to measure the magnitude of flavor symmetry violation in the proton sea. We examine the utility of the following beams: protons, charged pions, and charged kaons. In each case we present an approximate expression for the Drell-Yan asymmetry. Using currently available parton distributions, we locate those kinematic regions which provide the grea...

We investigate how Drell-Yan processes can be used to measure the magnitude of flavor symmetry violation in the proton sea. We examine the utility of the following beams: protons, charged pions, and charged kaons. In each case we present an approximate expression for the Drell-Yan asymmetry. Using currently available parton distributions, we locate those kinematic regions which provide the grea...

We consider a strictly hyperbolic n × n system of conservation laws in one space dimension ut + f(u)x = 0, together with Cauchy initial data u(0, x) = ū(x), that is a small BV ∩ L perturbation of fixed Riemann data (u− 0 , u 0 ). We a priori assume that the latter problem is solved by M large shocks (2 ≤ M ≤ n) of different characteristic families, each of them Majda stable and Lax compressive....

We review recent experimental and theoretical developments in the study of the sea quark structure of the proton. In the light quark sector, we analyse the recent pp and pD Drell-Yan data from the E866/NuSea experiment at Fermilab, and their implication on the d̄/ū asymmetry in the proton. The current status of the strange content of the proton, including the possible difference between strange ...

The sensitivity of W and Z production at RHIC to the possible ū/d̄ asymmetry in the proton is studied. The ratios of the W over W production cross sections in p+ p collision, as well as the ratios of the W and Z production cross sections for p + p over p + d collisions, are shown to be sensitive to this asymmetry. Predictions of various theoretical models for these ratios are presented. The vali...

The H1 and ZEUS combined data set on Neutral Current (NC) and Charged Current (CC) ep and ep inclusive cross sections is used as the input for next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) QCD parton density function (PDF) fits resulting in a new preliminary PDF set called HERAPDF2.0 (prel.). The analysis yields small experimental uncertainties and includes estimates for ...