Wgamma and Zgamma production at the LHC in NNLO QCD

We consider the production of $W\gamma$ and $Z\gamma$ pairs at hadron colliders. We report on the complete fully differential computation of radiative corrections at next-to-next-to-leading order (NNLO) in QCD perturbation theory. The calculation includes the leptonic decay of the vector boson with the corresponding spin correlations, off shell effects and final-state photon radiation. We present numerical results for $pp$ collisions at 7 and 8 TeV and we compare them with available LHC data. In the case of $Z\gamma$ production, the impact of NNLO corrections is generally moderate, ranging from 8% to 18%, depending on the applied cuts. In the case of $W\gamma$ production, the NNLO effects are more important, and range from 19% to 26%, thereby improving the agreement of the theoretical predictions with the data. As expected, the impact of QCD radiative corrections is significantly reduced when a jet veto is applied.Comment: 27 pages, 11 figure

ZZ production at the LHC: fiducial cross sections and distributions in NNLO QCD

We consider QCD radiative corrections to the production of four charged leptons in the ZZ signal region at the LHC. We report on the complete calculation of the next-to-next-to-leading order (NNLO) corrections to this process in QCD perturbation theory. Numerical results are presented for $\sqrt{s}=8$ TeV, using typical selection cuts applied by the ATLAS and CMS collaborations. The NNLO corrections increase the NLO fiducial cross section by about $15\%$, and they have a relatively small impact on the shape of the considered kinematical distributions. In the case of the $\Delta\Phi$ distribution of the two Z candidates, the NNLO corrections improve the agreement of the theoretical prediction with the CMS data.Comment: 9 pages, 3 figure

Transverse-momentum resummation for vector-boson pair production at NNLL+NNLO

We consider the transverse-momentum ($p_T$) distribution of $ZZ$ and $W^+W^-$ boson pairs produced in hadron collisions. At small $p_T$, the logarithmically enhanced contributions due to multiple soft-gluon emission are resummed to all orders in QCD perturbation theory. At intermediate and large values of $p_T$, we consistently combine resummation with the known fixed-order results. We exploit the most advanced perturbative information that is available at present: next-to-next-to-leading logarithmic resummation combined with the next-to-next-to-leading fixed-order calculation. After integration over $p_T$, we recover the known next-to-next-to-leading order result for the inclusive cross section. We present numerical results at the LHC, together with an estimate of the corresponding uncertainties. We also study the rapidity dependence of the $p_T$ spectrum and we consider $p_T$ efficiencies at different orders of resummed and fixed-order perturbation theory.Comment: 25 pages, 11 figure

W±ZW^\pm Z production at the LHC: fiducial cross sections and distributions in NNLO QCD

We report on the first fully differential calculation for $W^\pm Z$ production in hadron collisions up to next-to-next-to-leading order (NNLO) in QCD perturbation theory. Leptonic decays of the $W$ and $Z$ bosons are consistently taken into account, i.e. we include all resonant and non-resonant diagrams that contribute to the process $pp\to \ell^{'\pm} \nu_{\ell^{'}} \ell^+\ell^-+X$ both in the same-flavour ($\ell'=\ell$) and the different-flavour ($\ell'\neq \ell$) channel. Fiducial cross sections and distributions are presented in the presence of standard selection cuts applied in the experimental $W^\pm Z$ analyses by ATLAS and CMS at centre-of-mass energies of 8 and 13\,TeV. As previously shown for the inclusive cross section, NNLO corrections increase the NLO result by about $10\%$, thereby leading to an improved agreement with experimental data. The importance of NNLO accurate predictions is also shown in the case of new-physics scenarios, where, especially in high-$p_T$ categories, their impact can reach ${\cal O}(20\%)$. The availability of differential NNLO predictions will play a crucial role in the rich physics programme that is based on precision studies of $W^\pm Z$ signatures at the LHC.Comment: 38 pages, 18 figures, 8 table

Universal Corporation Business Overview: Presentation to the University of Richmond and Questions with Preston Wigner, General Counsel

George C. Freeman, III presented a business overview of Universal Corporation at the University of Richmond on September 5, 2007. Prior to joining Universal Leaf Tobacco Company in 1997, Mr. Freeman served as a law clerk for the Honorable Richard S. Arnold, Circuit Judge, United States Court of Appeals for the Eighth Circuit, and for the Honorable Lewis F. Powell, Jr., Associate Justice of the United States Supreme Court. He also spent time as an associate with Hunton & Williams, an international law firm. Mr. Freeman was elected General Counsel and Secretary of Universal Corporation in February 2001 and Vice President in November 2005. On December 12, 2006, the Board of Directors of Universal Corporation elected him to succeed Mr. Allen B. King as President of Universal Corporation

W+W−W^+W^- production at the LHC: fiducial cross sections and distributions in NNLO QCD

We consider QCD radiative corrections to $W^+W^-$ production at the LHC and present the first fully differential predictions for this process at next-to-next-to-leading order (NNLO) in perturbation theory. Our computation consistently includes the leptonic decays of the $W$ bosons, taking into account spin correlations, off-shell effects and non-resonant contributions. Detailed predictions are presented for the different-flavour channel $pp\to\mu^+e^-\nu_\mu {\bar \nu}_e+X$ at $\sqrt{s}=8$ and $13$ TeV. In particular, we discuss fiducial cross sections and distributions in the presence of standard selection cuts used in experimental $W^+W^-$ and $H\to W^+W^-$ analyses at the LHC. The inclusive $W^+W^-$ cross section receives large NNLO corrections, and, due to the presence of a jet veto, typical fiducial cuts have a sizeable influence on the behaviour of the perturbative expansion. The availability of differential NNLO predictions, both for inclusive and fiducial observables, will play an important role in the rich physics programme that is based on precision studies of $W^+W^-$ signatures at the LHC.Comment: 40 pages, 23 figures, 6 table

Climate Change and the Westhampton Lake: Review and Recommendations

The Westhampton Lake is a campus icon and one of the University of Richmond\u27s most prominent features. The significant attachment that members of the University community hold toward the lake imbues great value on the lake as a key geographic element of campus (Devine-Wright, 2013). However, the lake’s status as a campus monument does not absolve it from the greater effects of climate change, a phenomenon which will continue to transform the geography and ecology of the lake. Without a concrete understanding of the implications of current and future climate change on campus, the community may leave the Westhampton Lake susceptible to environmentally unsustainable practices which threaten the lake and, thereby, the face of campus. Over the course of the semester, student researchers collected and analyzed existing information about Westhampton Lake so as to educate the greater community on the lake’s health. This research team also offers recommendations so as to sustain the lake in the face of climate change on a local scale. Paper prepared for the Environmental Studies Senior Seminar/Geography Capstone

Climate Change and the Westhampton Lake

The Westhampton Lake is a cultural monument on campus and one of the University of Richmond\u27s most prominent features. Prospective students have made college decisions based on the lake\u27s beauty and alumni look forward to returning to the waterfront to reminisce about their college experience. The significance of place attachment that members of the Richmond community hold toward the lake imbues great value on the lake as a key geographic element of campus (Devine-Wright, 2013). However, our community suffers from a lack of knowledge around the health and sustainability of this dearly beloved body of water. Over the course of the semester, our mission has been to collect and analyze information to educate and advise the student body and faculty on the health and sustainability of Westhampton Lake. Poster prepared for the Environmental Studies Senior Seminar/Geography Capstone