Stanislaw Jadach

The Exclusive NLO DGLAP Kernels for Non-Singlet Evolution (2009)

Skrzypek, Maciej, Jadach, Stanislaw

We show for a first time ever a prototype of a fully exclusive QCD NLO parton shower for the initial state (albeit for a limited set of diagrams). It is based on the rigorous theorems of the...

Comparisons of Exact Results for the Virtual Photon Contribution to Single Harg Bremsstrahlung in Radiative Return for $e^{+}e^{-}$ Annihilation (2006)

Jadach, Stanislaw, Ward, B F L, Yost, S A

We compare fully differential exact results for the virtual photon correction to single hard photon bremsstrahlung obtained using independent calculations, both for electron-positron annihilation at...

Constrained non-Markovian Monte Carlo modelling of the evolution equation in QCD (2005)

Jadach, Stanislaw, Skrzypek, M

A new class of the constrained Monte Carlo (CMC) algorithms for the QCD evolution equation was recently discovered. The constraint is imposed on the type and the total longitudinal energy of the...

mFOAM-1.02: A Compact Version of the Cellular Event Generator FOAM (2005)

Jadach, Stanislaw, Sawicki, P

The general-purpose self-adapting Monte Carlo (MC) event generator/simulator mFOAM (standing for mini-FOAM) is a new compact version of the FOAM program, with a slightly limited functionality with...

Radiative Corrections to Bremsstrahlung in Radiative Return (2005)

Yost, S A, Jadach, Stanislaw, Ward, B F L

Radiating a photon from the initial state provides a useful tool for studying a range of low energy physics using a high-energy e+ e- accelerator. Accurate results require careful calculation of the...

Solving constrained Markovian evolution in QCD with the help of the non-Markovian Monte Carlo (2005)

Jadach, Stanislaw, Skrzypek, M

We present the constrained Monte Carlo (CMC) algorithm for the QCD evolution. The constraint resides in that the total longitudinal energy of the emissions in the MC and in the underlying QCD...

Solving constrained Markovian evolution in QCD with the help of the non-Markovian Monte Carlo (2005)

Jadach, Stanislaw, Skrzypek, M

We present the constrained Monte Carlo (CMC) algorithm for the QCD evolution. The constraint resides in that the total longitudinal energy of the emissions in the MC and in the underlying QCD...

Non-Markovian Monte Carlo Algorithm for the Constrained Markovian Evolution in QCD (2005)

Jadach, Stanislaw, Skrzypek, M

We revisit the challenging problem of finding an efficient Monte Carlo (MC) algorithm solving the constrained evolution equations for the initial-state QCD radiation. The type of the parton (quark,...

Non-Markovian Monte Carlo Algorithm for the Constrained Markovian Evolution in QCD (2005)

Jadach, Stanislaw, Skrzypek, M

We revisit the challenging problem of finding an efficient Monte Carlo (MC) algorithm solving the constrained evolution equations for the initial-state QCD radiation. The type of the parton (quark,...

The Femto-experiment for the LHC: The W-boson beams and their targets (2005)

Krasny, M W, Jadach, Stanislaw, Placzek, Wiesiek

The LHC has been designed as a collider of proton and ion beams. However, in its experimental program, which is focused mainly on studies of high energy transfer collisions of Standard Model...

Exact solutions of the QCD evolution equations using Monte Carlo method (2005)

Jadach, Stanislaw, Skrzypek, M

We present the exact and precise (~0.1%) numerical solution of the QCD evolution equations for the parton distributions in a wide range of $Q$ and $x$ using Monte Carlo (MC) method, which relies on...

Electroweak Physics (2005)

Hollik, W, Accomando, A, Del Águila, F, Awramik, M, Ballestrero, A, Van Der Bij, J J, ...

Work on electroweak precision calculations and event generators for electroweak physics studies at current and future colliders is summarized.

Threshold Corrections in Precision LHC Physics: QED otimes QCD (2004)

Ward, B F L, Glosser, C, Jadach, Stanislaw, Yost, S A

With an eye toward LHC processes in which theoretical precisions of 1 percent are desired, we introduce the theory of the simultaneous YFS resummation of QED and QCD to compute the size of the...

New Results on Precision Studies of Heavy Vector Boson Physics (2004)

Ward, B F L, Glosser, C, Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, M, Was, Z, ...

We present new results for two important heavy vector boson physics processes: (1), virtual corrections to hard bremsstrahlung which are relevant to precision predictions for the radiative return...

Threshold Corrections in QED otimes QCD at the LHC (2004)

Ward, B F L, Glosser, C, Jadach, Stanislaw, Yost, S A

In some processes at the LHC, theoretical precisions of 1 percent are desired. With an eye toward such precisions, we introduce the theory of the simultaneous YFS resummation of QED and QCD to...

Comparisons of Fully Differential Exact Results for O(alpha) Virtual Corrections to Single Hard Bremsstrahlung in e+e- Annihilation at High Energies (2004)

Glosser, C, Jadach, Stanislaw, Ward, B F L, Yost, S A

We present comparisons of the fully differential exact virtual correction to the important single hard bremsstrahlung process in e+e- annihilation at high energies, which is essential for precision...

QED $\otimes$ QCD Threshold Corrections at the LHC (2004)

Glosser, C, Jadach, Stanislaw, Ward, B F L, Yost, S A

We use the theory of YFS resummation to compute the size of the expected resummed soft radiative threshold effects in precision studies of heavy particle production at the LHC, where accuracies of 1...

Comparisons of the Monte Carlo programs HORACE and WINHAC for single-W-boson production at hadron colliders (2004)

Carloni-Calame, C M, Jadach, Stanislaw, Montagna, G, Nicrosini, O, Placzek, Wiesiek

We present the comparisons of two independent Monte Carlo event generators, HORACE and WINHAC, for single-W-boson production in hadronic collisions with multiphoton effects in leptonic W decays....

Theoretical error of luminosity cross section at LEP (2003)

Jadach, Stanislaw

The aim of this note is to characterize briefly main components of theoretical error of the small angle Bhabha measurement at LEP and to discuss critically how solid these estimates really are, from...

Multiphoton Radiation in Leptonic W-Boson Decays (2003)

Placzek, Wiesiek, Jadach, Stanislaw

We present the calculation of multiphoton radiation effects in leptonic W-boson decays in the framework of the Yennie-Frautschi-Suura exclusive exponentiation. This calculation is implemented in the...

Comparison of SANC with KORALZ and PHOTOS (2002)

Andonov, A, Jadach, Stanislaw, Nanava, G, Was, Zbigniew

Using the SANC system we study the one-loop electroweak standard model prediction, including virtual and real photon emissions, for the decays of on-shell vector and scalar bosons B --> f anti-f...

Foam: A General purpose Monte Carlo Cellular Algorithm (2002)

Jadach, Stanislaw

A general-purpose, self-adapting Monte Carlo (MC) algorithm implemented in the program {\tt Foam} is described. The high efficiency of the MC, that is small maximum weight or variance of the MC...

CEEX Exponentiation in QED (2002)

Jadach, Stanislaw

The aim is to summarize briefly on: (a) Main features of YFS Cohenetn Exclusive EXponentiation in QED, (b) Examples of recent results relevant for LEP/LC physics program.

Precision W-pair physics with the YFSWW3 and KoralW Monte Carlos (2002)

Skrzypek, Maciej, Jadach, Stanislaw, Placzek, Wiesiek, Ward, B F L, Was, Zbigniew

We present the recent developments in the precision studies of W-pair and single-W processes in e+e- collisions achieved with the help of the KoralW and YFSWW3 Monte Carlo generators. We focus on the...

Electric Charge Screening Effect in Single-W Production with the KoralW Monte Carlo (2002)

Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, Maciej, Ward, B F L, Was, Zbigniew

Any Monte Carlo event generator in which only initial state radiation (ISR) is implemented, or ISR is simulated independently of the final state radiation (FSR), may feature too many photons with...

YFS MC Approach to QCD Soft Gluon Exponentiation (2002)

Ward, B F L, Jadach, Stanislaw

We present two things in this discussion. First, we develop and prove the theory of the extension of the YFS Monte Carlo approach to higher order SU_{2L} x U_1 radiative corrections to the analogous...

Foam: A General Purpose Cellular Monte Carlo Event Generator (2002)

Jadach, Stanislaw

A general purpose, self-adapting, Monte Carlo (MC) event generator (simulator) is described. The high efficiency of the MC, that is small maximum weight or variance of the MC weight is achieved by...

On Theoretical Uncertainties of the W Angular Distribution in W-Pair Production at LEP2 Energies (2002)

Brunelière, R, Denner, A, Dittmaier, S, Jadach, Stanislaw, Jézéquel, S, Placzek, Wiesiek, ...

We discuss theoretical uncertainties of the distribution in the cosine of the W polar angle projected into a measurement of the anomalous triple gauge-boson coupling...

Predictions for ${\bar \nu} \nu \gamma$ Production at LEP (2001)

Bardin, Dimitri Yuri, Jadach, Stanislaw, Riemann, Tord, Was, Zbigniew

We study predictions for the reaction $e^+e^- \to {\bar \nu} \nu (n \gamma)$. The complete one-loop corrections are taken into account and higher order contributions, in particular those for the...

Exact Differential $O(\alpha^{2})$ Results for Hard Bremsstrahlung in $e^{+}e^{-}$ Annihilation to two fermions at and Beyond LEP2 Energies (2001)

Jadach, Stanislaw, Melles, M, Ward, B F L, Yost, S A

We present the exact O(alpha) correction to the process e+ e- -> f f-bar + gamma, f neq e, for ISR oplus FSR at and beyond LEP2 energies. We give explicit formulas for the completely differential...

On Theoretical Uncertainties of the W Boson Mass Measurement at LEP2 (2001)

Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, Maciej, Ward, B F L, Was, Zbigniew

We discuss theoretical uncertainties of the measurement of the $W$ boson mass at LEP2 energies, reconstructed with the help of the tandem of the Monte Carlo event generators KoralW and YFSWW3....

The Monte Carlo Program KoralW version 1.51 and The Concurrent Monte Carlo KoralW\&YFSWW3 with All Background Graphs and First Order Corrections to W-Pair Production (2001)

Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, Maciej, Ward, B F L, Was, Zbigniew

The version 1.51 of the Monte Carlo (MC) program KoralW for all $e^+e^-\to f_1\bar f_2 f_3\bar f_4$ processes is presented. The most important change since the previous version 1.42 is the facility...

The Monte Carlo Event Generator YFSWW3 version 1.16 for W-Pair Production and Decay at LEP2/LC Energies (2001)

Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, Maciej, Ward, B F L, Was, Zbigniew

We present the Monte Carlo event generator YFSWW3 version 1.16 for theprocess of W-pair production and decay in electron-positron collisions. It includes ${\cal O}(\alpha)$ electroweak radiative...

Precision Predictions for (Un)Stable $WW/4f$ Production in $e^{+}e^{-}$ Annihilation (2001)

Ward, B F L, Skrzypek, Maciej, Placzek, Wiesiek, Jadach, Stanislaw

We present precision calculations of the processes e+ e- -> 4-fermions in which the double resonant W+ W- and ZZ intermediate states occur. Referring to these latter intermediate states as the...

Precision Predictions for (Un)Stable $WW/4f$ Production in $e^{+}e^{-}$ Annihilation: YFSWW3/KoralW-1.42/YFSZZ (2001)

Ward, B F L, Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, Maciej

We present precision calculations of the processes e+ e- -> 4-fermions in which the double resonant W+ W- and ZZ intermediate states occur. Referring to these latter intermediate states as the...

Coherent Exclusive Exponentiation of 2f Processes in e+e- Annihilation (2001)

Was, Zbigniew, Jadach, Stanislaw, Ward, B F L

In the talk we present the Coherent Exclusive Exponentiation (CEEX) which is implemented in the KK MC event generator for the process e+e- to f bar f +n gamma, f=mu,tau,d,u,s,c,b for center of mass...

Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations (2000)

Jadach, Stanislaw, Ward, B F L, Was, Zbigniew

In this contribution we give a short overview of the new Coherent Exclusive Exponentiation (CEEX) which is implemented in the new \KK MC event generator for the process $e^+e^-\to f\bar{f} +n\gamma$,...

W-Pair Production with YFSWW/KoralW (2000)

Placzek, Wiesiek, Jadach, Stanislaw, Skrzypek, Maciej, Ward, B F L, Was, Zbigniew

A theoretical description of W-pair production in terms of two complementary Monte Carlo event generators YFSWWand KoralW is presented. The way to combine the results of these two programs in order...

Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations of Fermion Pair Production (2000)

Ward, B F L, Was, Zbigniew, Skrzypek, Maciej, Placzek, Wiesiek, Jadach, Stanislaw

We present the new Coherent Exclusive Exponentiation (CEEX), in comparison to the older Exclusive Exponentiation (EEX) and the semi-analytical Inclusive Exponentiation (IEX), for the process e+e- ->...

Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations of Fermion Pair Production: Precision Predictions for (Un)stable $W^{+}W^{-}$ Pairs (2000)

Ward, B F L, Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, Maciej, Was, Zbigniew

We present the new Coherent Exclusive Exponentiation (CEEX), in comparison to the older Exclusive Exponentiation (EEX) and the semi-analytical Inclusive Exponentiation (IEX), for the process e+e- ->...

Two-Fermion Production in Electron-Positron Collisions (2000)

Kobel, M, Was, Zbigniew, Ainsley, C, Arbuzov, A, Arcelli, S, Bardin, Dimitri Yuri, ...

This report summarizes the results of the two-fermion working group of the LEP2-MC workshop, held at CERN from 1999 to 2000. Recent developments in the theoretical calculations of the two fermion...

Precision Predictions for (Un)Stable $W^{+}W^{-}$ Pair Production at and Beyond LEP2 Energies (2000)

Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, M, Ward, B F L, Was, Z

We present precision calculations of the processes e+e- -> 4-fermions in which the double resonant W+W- intermediate state occurs. Referring to this latter intermediate state as the 'signal process',...

Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations (2000)

Jadach, Stanislaw, Ward, B F L, Was, Zbigniew

We present the new Coherent Exclusive Exponentiation (CEEX), the older Exclusive Exponentiation (EEX) and the semi-analytical Inclusive Exponentiation (IEX) for the process $e^+e^-\to f\bar{f}...

Four-Fermion Production in Electron-Positron Collisions (2000)

Grünewald, M W, Passarino, G, Accomando, E, Ballestrero, A, Bambade, P, Bardin, Dimitri Yuri, ...

This report summarises the results of the four-fermion working group of the LEP2-MC workshop, held at CERN from 1999 to 2000. Recent developments in the calculation of four-fermion processes in...

Second General Meeting of the LEP2 Workshop (2000)

Aurenche, Patrick, Altarelli, Guido, Jadach, Stanislaw, Nicrosini, O, Seymour, Michael H

yy. yy(Ev.gener.). Bhabha(Ev.gener.) Report on physics motivations for an energy upgrade of LEP2.

The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In $e^{+}e^{-}$ Collisions (1999)

Jadach, Stanislaw, Ward, B F L, Was, Zbigniew

We present the Monte Carlo event generator KK version 4.12 for precision predictions of the Electroweak Standard Model for the process $e^+e^-\to $b,c,\tau$-factories etc. Effects due to photon...

On the precision of calculations of initial state radiation in the LEP Z line-shape fits (1999)

Jadach, Stanislaw, Pietrzyk, B, Skrzypek, Maciej

Calculation of initial state radiation (ISR) in the fitting program MIZA and in the standard model program BHM is improved within the analysis of the Z line-shape measurements at LEP. The uncertainty...

Foam: Multi-Dimensional General Purpose Monte Carlo Generator With Self-Adapting Symplectic Grid (1999)

Jadach, Stanislaw

A new general purpose Monte Carlo event generator with self-adapting grid consisting of simplices is described. In the process of initialization, the simplex-shaped cells divide into daughter...

Initial-Final-State Interference in the Z line-shape (1999)

Jadach, Stanislaw, Pietrzyk, B, Tournefier, E, Ward, B F L, Was, Zbigniew

The uncertainty in the determination of the Z line-shape parameters coming from the precision of the calculation of the Initial-State Radiation and Initial--Final-State Interference is 2 10**(-4) for...

Final State Radiative Effects for the Exact $O(\alpha)YFS$ Exponentiated (Un)Stable $W^{+}W^{-}$ Production At and Beyond LEP2 Energies (1999)

Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, Maciej, Ward, B F L, Was, Zbigniew

We present the LL final state radiative effects for the exact O(alpha) YFS exponentiated (un)stable WW pair production at LEP2/NLC energies using Monte Carlo event generator methods. The respective...

The Monte Carlo Program KORALZ, for the Lepton or Quark Pair Production at LEP/SLC Energies: From version 4.0 to version 4.04 (1999)

Jadach, Stanislaw, Ward, B F L, Was, Zbigniew

Brief information on new features of KORALZ version 4.04 with respect to version 4.0 is given. The main difference is that the new version could be used at LEP2 energies, i.e. up to 240 GeV...

Precision Calculation of Bhabha Scattering at LEP (1999)

Placzek, Wiesiek, Jadach, Stanislaw, Melles, M, Ward, B F L, Yost, S A

For the small-angle Bhabha-scattering process, we consider the error budget for the calculation of the LEP/SLC luminosity in the Monte Carlo event generator BHLUMI 4.04, from the standpoint of new...

Precision Calculations of Heavy Boson Production: YFS Monte Carlo Approach (1999)

Skrzypek, Maciej, Jadach, Stanislaw, Placzek, Wiesiek, Ward, B F L, Was, Zbigniew

In this talk I present the current status of the family of Monte Carlo programs for four-fermion physics based on the Yennie-Frautschie-Suura resummation of soft real and virtual photons. I focus on...

Coherent exclusive exponentiation CEEX: the case of the resonant $e^+ e^-$ collision (1999)

Jadach, Stanislaw, Ward, B F L, Was, Zbigniew

We present the first-order coherent exclusive exponentiation (CEEX) scheme, with the full control over spin polarization for all fermions. In particular it is applicable to difficult case of narrow...

Global positioning of spin GPS scheme for half-spin massive spinors (1998)

Jadach, Stanislaw, Ward, B F L, Was, Zbigniew

We present a simple and flexible method of keeping track of the complex phases and spin quantisation axes for half-spin initial- and final-state Weyl spinors in scattering amplitudes of Standard...

Gauge Invariant YFS Exponentiation of (Un)stable $Z$-Pair Production At and Beyond LEP2 Energies (1997)

Jadach, Stanislaw, Placzek, Wiesiek, Ward, B F L

We present the theoretical basis and sample Monte Carlo data for the YFS exponentiated calculation of $e^+e^- \to Z Z \to f_1\bar f_1 + \bar f_2 f_2$ at and beyond LEP2 energies, where the...

$e^+ e^-$ Annihilation into Hadrons at LEP2 in the Presence of the Anomalous DESY Positron-Jet Event Phenomenon (1997)

Jadach, Stanislaw, Ward, B F L, Was, Zbigniew

We discuss the allowed parameter regime in the coupling-mass plane implied by the existing LEP2 data on e+ e- -> hadrons at 172.3 GeV for the vector leptoquark interpretation of the anomalous DESY...

BHWIDE 1.00: O(alpha) YFS Exponentiated Monte Carlo for Bhabha Scattering at Wide Angles for LEP1\/SLC and LEP2 (1996)

Jadach, Stanislaw, Placzek, Wiesiek, Ward, B F L

We present O(alpha) YFS exponentiated results for wide angle Bhabha scattering at LEP/SLC energies using a new Monte Carlo event generator BHWIDE 1.xx. Our calculations include two options for the...

BHWIDE 1.00: O(alpha) YFS Exponentiated Monte Carlo for Bhabha Scattering at Wide Angles for LEP1\/SLC and LEP2 (1996)

Jadach, Stanislaw, Placzek, Wiesiek, Ward, B F L

We present O(alpha) YFS exponentiated results for wide angle Bhabha scattering at LEP/SLC energies using a new Monte Carlo event generator BHWIDE 1.xx. Our calculations include two options for the...

Bhabha Process at LEP: Theoretical Calculations (1996)

Jadach, Stanislaw, Melles, M, Ward, B F L, Yost, S A

In this contribution we give a short overview of the situation in the precision calculation of the Bhabha process and we present a preliminary numerical result on the second-order sub-leading...

Gauge invariant YFS exponentiation of (un)stable W$^{+}$W$^{-}$ production at and beyond LEP2 energies (1996)

Jadach, Stanislaw, Placzek, Wiesiek, Skrzypek, Maciej, Ward, B F L

We present the theoretical basis and sample Monte Carlo data for the YFS exponentiated calculation of e^+e^- \rightarrow W^+ W^- \rightarrow f_1\bar f'_1 + \bar f_2 f'_2 at and beyond LEP2 energies,...

The present theoretical error on the Bhabha scattering cross section in the luminometry region at LEP (1996)

Arbuzov, A B, Bigi, M, Burkhardt, H, Cacciari, M, Caffo, M, Dallavalle, G M, ...

The results concerning the theoretical evaluation of the small-angle Bhabha Scattering cross section obtained during the Workshop on Physics at LEP2 (CERN, Geneva, Switzerland, 1995) by the Working...

WW cross-sections and distributions (1996)

Beenakker, W, Berends, F A, Argyres, E N, Bardin, Dimitri Yuri, Denner, A, Dittmaier, S, ...

We present the results obtained by the "WW Cross-sections and Distributions" working group during the CERN Workshop "Physics at LEP2" (1994/1995)

Standard model processes (1996)

Boudjema, F, Melé, Barbara, Accomando, E, Ambrosanio, S, Ballestrero, A, Bardin, Dimitri Yuri, ...

We present the results obtained by the Standard Model Process group in the CERN Workshop "Physics at LEP2" (1994/95).

Radiative corrections in processes at the SSC (1992)

Siopsis, G, Delaney, D B, Jadach, Stanislaw, Shio, C, Ward, B F L

We discuss radiative corrections for interactions in the SSC environment. Based on the theory of Yennie, Frautschi and Suura, we develop appropriate Monte Carlo event generators to compute the...