A5070951603- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Distributed and Parallel Computing Systems
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
- Advanced Data Storage Technologies
- Scientific Computing and Data Management
- Astrophysics and Cosmic Phenomena
- Economic, financial, and policy analysis
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Engineering Applied Research
- Parallel Computing and Optimization Techniques
- Software Reliability and Analysis Research
- Graphite, nuclear technology, radiation studies
- Structural Analysis of Composite Materials
- Structural Analysis and Optimization
- Nuclear physics research studies
Deutsches Elektronen-Synchrotron DESY
2016-2025
University of Vienna
2018
Trinity College Dublin
2018
University of California, San Diego
2013
Massachusetts Institute of Technology
2009-2013
Lawrence Berkeley National Laboratory
2005-2009
University of California, Berkeley
2006-2009
Technische Universität Dresden
2005
This work is on the Physics of B Factories. Part A this book contains a brief description SLAC and KEK Factories as well their detectors, BaBar Belle, data taking related issues. discusses tools methods used by experiments in order to obtain results. The results themselves can be found C. Please note that version 3 archive auxiliary book. uses notation alpha, beta, gamma for angles Unitarity Triangle. nominal phi_1, phi_2 phi_3. cite Eur. Phys. J. C74 (2014) 3026.
Jet vetoes are essential in many analyses at the LHC and Tevatron. Typical signals have a specific number of hard jets or leptons, while backgrounds additional jets. Vetoing undesired efficiently discriminates signal background. For sample with ≥N jets, veto to give N energetic defines an "exclusive" N-jet cross section. This strongly restricts phase space causes large double logarithms perturbation theory that must be summed. typically implemented using jet algorithms, yielding complicated...
We present the physics program of Belle II experiment, located on intensity frontier SuperKEKB $e^+e^-$ collider. collected its first collisions in 2018, and is expected to operate for next decade. It anticipated collect 50/ab collision data over lifetime. This book outcome a joint effort collaborators theorists through theory interface platform (B2TiP), an that commenced 2014. The aim B2TiP was elucidate potential impacts program, which includes wide scope topics: B physics, charm, tau,...
We study proton-(anti)proton collisions at the LHC or Tevatron in presence of experimental restrictions on hadronic final state and for generic parton momentum fractions. At scale Q hard interaction, factorization does not yield standard distribution functions (PDFs) initial state. The measurement restricting introduces a new \mu_B << probes proton prior to collision. This corresponds evaluating PDFs \mu_B. After is probed, incoming contained an initial-state jet, collision occurs between...
We present a subtraction method utilizing the N -jettiness observable, T , to perform QCD calculations for arbitrary processes at next-to-next-to-leading order (NNLO). Our employs soft-collinear effective theory (SCET) determine IR singular contributions of -jet cross sections → 0, and uses these construct suitable -subtractions. The construction is systematic economic, due being based on physical observable. resulting NNLO calculation fully differential in form directly combining with...
In the original version of this manuscript, an error was introduced on pp352. '2.7nb:1.6nb' has been corrected to '2.4nb:1.3nb' in current online and printed version. doi:10.1093/ptep/ptz106.
A bstract We provide state-of-the-art precision QCD predictions for the fiducial W and Z boson transverse momentum spectra at LHC N 3 LL ′ approximate 4 in resummed perturbation theory, matched to available $$ \mathcal{O}\left({\alpha}_s^3\right) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> <mml:mfenced> <mml:msubsup> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> <mml:mn>3</mml:mn> </mml:msubsup> </mml:mfenced> </mml:math> fixed-order results. Our consistently combine...
The parton distribution function for a $b$ quark in the $B$ meson (called shape function) plays an important role analysis of $B\ensuremath{\rightarrow}{X}_{s}\ensuremath{\gamma}$ and $B\ensuremath{\rightarrow}{X}_{u}\ensuremath{\ell}\overline{\ensuremath{\nu}}$ data, gives one dominant uncertainties determination $|{V}_{ub}|$. We introduce new framework to treat function, which consistently incorporates its renormalization group evolution all constraints on moments any short distance mass...
Bounds on the Higgs mass from Tevatron and LHC are determined using exclusive jet bins to maximize sensitivity. Scale variation in fixed-order predictions underestimates perturbative uncertainty for these cross sections, due cancellations between corrections leading large K factors those that induce logarithmic sensitivity jet-bin boundary. To account this, we propose scale calculations should be used determine theory uncertainties inclusive whose differences yield sections. This yields a...
We present predictions for Higgs production via gluon fusion with a ${p}_{T}$ veto on jets and the resummation of jet-veto logarithms at ${\mathrm{NNLL}}^{\ensuremath{'}}+\mathrm{NNLO}$ order. These results incorporate explicit $\mathcal{O}({\ensuremath{\alpha}}_{s}^{2})$ calculations soft beam functions, which include dominant dependence jet radius $R$. In particular ${\mathrm{NNLL}}^{\ensuremath{'}}$ order accounts correct boundary conditions $\mathrm{N}{}^{3}\mathrm{LL}$ resummation, only...
We present results for Drell-Yan production from the geneva Monte-Carlo framework. combine fully differential next-to-next-to leading order (NNLO) calculation with higher-order resummation in 0-jettiness resolution variable. The resulting parton-level events are further combined parton showering and hadronization provided by pythia8. is carried out to ${\mathrm{NNLL}}^{\ensuremath{'}}$, which consistently incorporates all singular virtual real NNLO corrections. It thus provides a natural...
We extend the lowest-order matching of tree-level matrix elements with parton showers to give a complete description at next higher perturbative accuracy in alpha_s both small and large jet resolutions, which has not been achieved so far. This requires combination higher-order resummation Sudakov logarithms values resolution variable full next-to-leading order (NLO) matrix-element corrections values. As by-product this naturally leads smooth connection NLO calculations for different...
A number of important observables exhibit logarithms in their perturbative description that are induced by emissions at widely separated rapidities. These include transverse-momentum ($q_T$) logarithms, involving heavy-quark or electroweak gauge boson masses, and small-$x$ logarithms. In this paper, we initiate the study rapidity associated divergences, subleading order power expansion. This is accomplished using soft collinear effective theory (SCET). We discuss structure subleading-power...
The $N$-jettiness observable ${\mathcal{T}}_{N}$ provides a way of describing the leading singular behavior $N$-jet cross section in $\ensuremath{\tau}={\mathcal{T}}_{N}/Q\ensuremath{\rightarrow}0$ limit, where $Q$ is hard interaction scale. We consider subleading-power corrections $\ensuremath{\tau}\ensuremath{\ll}1$ expansion, and employ soft-collinear effective theory to obtain analytic results for dominant ${\ensuremath{\alpha}}_{s}\ensuremath{\tau}\mathrm{ln}\ensuremath{\tau}$...
Multijet cross sections at the LHC and Tevatron are sensitive to several distinct kinematic energy scales. When measuring dijet invariant mass m_jj between two signal jets produced in association with other or weak bosons, will typically be much smaller than total partonic center-of-mass Q, but larger individual jet masses m, such that there can a hierarchy of scales m << Q. This situation arises many new-physics analyses LHC, where is used gain access particles decay chain. At present,...
In differential measurements at a hadron collider, collinear initial-state radiation is described by process-independent beam functions. They are the field-theoretic analog of parton showers. Depending on measured observable they in virtuality and/or transverse momentum colliding partons addition to usual longitudinal fraction. Perturbatively, functions can be calculated matching them onto standard quark and gluon distribution We calculate inclusive virtuality-dependent function NNLO, which...
A bstract We consider Drell-Yan production pp → V * X LX at small q T ≪ Q , where and are the total transverse momentum invariant mass of leptonic final state L . Experimental measurements require fiducial cuts on which in general introduce enhanced, linear power corrections /Q show that they can be unambiguously predicted from factorization, resummed to same order as leading-power contribution. For spectrum, constitute complete corrections. thus obtain predictions for spectrum N 3 LL...
We present predictions for the gluon-fusion Higgs $p_T$ spectrum at third resummed and fixed order (N$^3$LL$'+$N$^3$LO) including fiducial cuts as required by experimental measurements Large Hadron Collider. Integrating spectrum, we predict first time total cross section to (N$^3$LO) improved resummation. The N$^3$LO correction is enhanced cut-induced logarithmic effects not reproduced inclusive times a lower-order acceptance. These are highest-order of their kind achieved so far hadron collider.
The invariant mass of a jet is benchmark variable describing the structure jets at LHC. We calculate spectrum for Higgs plus one LHC next-to-next-to-leading logarithmic (NNLL) order using factorization formula. At this order, cross section becomes sensitive to perturbation theory soft ${m}_{\mathrm{jet}}^{2}/{p}_{T}^{\mathrm{jet}}$ scale. Our calculation exclusive and uses 1-jettiness global event shape implement veto on additional jets. dominant dependence removed by normalizing spectrum,...
The N-jettiness event shape divides phase space into N+2 regions, each containing one jet or beam. Using a geometric measure these regions correspond to jets with circular boundaries. We give factorization theorem for the cross section fully differential in (transverse) mass of jet, and compute corresponding soft function at next-to-leading order (NLO). ultraviolet divergences are analytically extracted by exploiting hemispheres interactions between pair hard partons, leaving only convergent...
At the LHC and Tevatron strong initial-state radiation (ISR) plays an important role. It can significantly affect partonic luminosity available to hard interaction or contaminate a signal with additional jets soft radiation. An ideal process study ISR is isolated Drell-Yan production, pp → Xℓ+ ℓ- without central jets, where jet veto provided by hadronic event shape beam thrust τB. Most hadron collider shapes are designed jets. In contrast, requiring τ B << 1 provides inclusive of measures...