vol. 38, p. 2229 (13 pages)
•abstract
With our current knowledge limited by the absence of physics data, I review our expectations from standard processes measurements at the LHC. Focusing on charged and neutral current processes, I illustrate how their measurement will constrain our uncertainties on discovery physics, and give some arguments about our precision goal for the \(W\) mass measurement. Detailed analysis reveals that there is no reason to believe we can not measure this fundamental parameter to about 5 MeV, most uncertainties (of both experimental and theoretical source) being constrained by a detailed measurement of \(Z\) production.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2229/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2229
cite as
Acta Phys. Pol. B 38, 2229 (2007)
vol. 38, p. 2243 (18 pages)
•abstract
It is a brief review on composing and solving Infrared Evolution Equations. They can be used in order to calculate amplitudes of high-energy reactions in different kinematic regions in the double-logarithmic approximation.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2243/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2243
cite as
Acta Phys. Pol. B 38, 2243 (2007)
vol. 38, p. 2261 (11 pages)
•abstract
We report on progress with the new Monte Carlo event generator Herwig++. The chain of event simulation is briefly outlined and details on current developments, particularly in the framework of Herwig++ are given.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2261/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2261
cite as
Acta Phys. Pol. B 38, 2261 (2007)
vol. 38, p. 2273 (6 pages)
•abstract
We illustrate the use of new on-shell methods, 4-dimensional unitarity cuts combined with on-shell recursions relations by computing the \(A_4^{(1)} (\phi ,1^-,2^-,3^+,4^+)\) amplitude in the large top mass limit where the Higgs boson couples to gluons through an effective interaction.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2273/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2273
cite as
Acta Phys. Pol. B 38, 2273 (2007)
vol. 38, p. 2279 (25 pages)
•abstract
I discuss the importance of understanding Standard Model predictions and results at the LHC during the early running.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2279/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2279
cite as
Acta Phys. Pol. B 38, 2279 (2007)
vol. 38, p. 2305 (14 pages)
•abstract
An effort of formulating, implementing and testing new parton shower Monte Carlo for \(W\)/\(Z\) production at Large Hadron Collider (LHC) is presented. In particular, it is indicated how to construct a constrained Monte Carlo (CMC) parton shower algorithm implementing the CCFM-like evolution for a single hadron beam and how to combine two such CMCs into the single MC simulating initial state QCD radiation. Preliminary numerical results are presented.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2305/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2305
cite as
Acta Phys. Pol. B 38, 2305 (2007)
vol. 38, p. 2319 (11 pages)
•abstract
In this talk we discuss selected topics concerning calculations of transverse momentum distributions for the Standard Model boson production at the LHC.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2319/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2319
cite as
Acta Phys. Pol. B 38, 2319 (2007)
vol. 38, p. 2331 (8 pages)
•abstract
We make predictions for the diffractive longitudinal structure function \(F_{\rm L}^{\rm D}\) to be measured at HERA, based on the DGLAP fits of diffractive parton distributions with an additional twist-4 term. This term describes the diffractive \(q\bar {q}\) production from longitudinal photons. The twist-4 contribution significantly changes predictions for \(F_{\rm L}^{\rm D}\) obtained in the pure DGLAP analysis.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2331/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2331
cite as
Acta Phys. Pol. B 38, 2331 (2007)
vol. 38, p. 2339 (8 pages)
•abstract
The usefulness of recursive equations to compute scattering matrix elements for arbitrary processes is reviewed. The importance of the recently presented reduction method at the integrand level that opens the possibility to use efficiently recursive equations for one-loop amplitude and cross sections, is also briefly discussed.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2339/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2339
cite as
Acta Phys. Pol. B 38, 2339 (2007)
all authors
G. Balossini, G. Montagna, C.M. Carloni Calame, M. Moretti, M. Treccani, O. Nicrosini, F. Piccinini, A. Vicini
vol. 38, p. 2347 (9 pages)
•abstract
Precision studies of weak boson production at the LHC require that electroweak and QCD higher-order corrections are simultaneously taken into account in data analysis. After a review of the present status of higher-order calculations for single \(W\) and \(Z\) boson production at hadron colliders, we present some preliminary results on the combination of electroweak and QCD corrections to a sample of observables of the process \(p p \to W^\pm \to \mu ^\pm + X\) at the LHC. Our phenomenological analysis shows that a high-precision knowledge of QCD and a careful combination of electroweak and strong contributions is mandatory in view of the anticipated experimental accuracy.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2347/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2347
cite as
Acta Phys. Pol. B 38, 2347 (2007)
vol. 38, p. 2357 (12 pages)
•abstract
We discuss precision Monte Carlo (MC) calculations for solving the QCD evolution equations up to the next-to-leading-order (NLO) level. They employ forward Markovian Monte Carlo algorithms, which provide rigorous solutions of the above equations. These algorithms are implemented in the form of the Monte Carlo program EvolFMC. This program has been cross-checked with independent, non-MC, programs (QCDNum16 and APCheb33) and the numerical agreement at the level of \(0.1\%\) has been found.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2357/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2357
cite as
Acta Phys. Pol. B 38, 2357 (2007)
vol. 38, p. 2369 (10 pages)
•abstract
We present a description of a Monte Carlo algorithm that solves the modified DGLAP-type evolution equation in QCD. The change with respect to normal DGLAP is in the form of the argument of the coupling constant. We consider primarily the CCFM-like form \(\alpha (k_{\rm T})\), but also a simpler choice \(\alpha (Q(1-z))\) is discussed. The evolution is performed in the rapidity space with strict rapidity ordering and no gaps in phase-space.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2369/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2369
cite as
Acta Phys. Pol. B 38, 2369 (2007)
vol. 38, p. 2379 (15 pages)
•abstract
We present a new method of matching the Constrained Monte Carlo (CMC) algorithm to next-to-leading order matrix elements. In such matching, one must simultaneously treat the infra-red singularities of the matrix element and double counting issues between the two contributions. In the proposed method these two issues are dealt with by a specially defined counterterm. This counterterm is analyzed in detail and the connection of the CMC algorithm and formal factorization theorems is given. This counterterm also allows many new processes to be quickly integrated into the algorithm as the application of the counterterm can be done at the matrix element generation level and all residual issues in the parton shower are universal.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2379/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2379
cite as
Acta Phys. Pol. B 38, 2379 (2007)
vol. 38, p. 2395 (9 pages)
•abstract
We present the theory of QED\(\otimes \)QCD resummation and its interplay with shower/matrix element matching in precision LHC physics scenarios. We illustrate the theory using single heavy gauge boson production at hadron colliders.
direct link to the full text (pdf)
https://www.actaphys.uj.edu.pl/R/38/7/2395/pdf
link to the articles list
https://www.actaphys.uj.edu.pl/R/38/7/2395
cite as
Acta Phys. Pol. B 38, 2395 (2007)
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