Scientific Commons: Zbigniew Was

PHOTOS as a pocket parton shower: flexibility tests for the algorithm, these proceedings (2009)

PHOTOS is widely used for generation of bremsstrahlung in decays of particles and resonances in LHC applications. We document here its recent tests and variants. Special emphasis is on those aspects...

Cracow Epiphany Conference on LHC Physics (2008)

Skrzypek, Maciej, Was, Zbigniew

Tau and muon pair production cross-sections in electron-positron annihilations at sqrt{s} = 10.58 GeV (2007)

Banerjee, Swagato, Pietrzyk, Bolek, Roney, J. Michael, Was, Zbigniew

The calculational precision of $\ee\to\tautau$ and $\ee\to\mumu$ production cross-sections in electron-positron annihilations at \roots = 10.58 \gev are studied for the \kk Monte Carlo simulation...

PHOTOS as a pocket parton shower: flexibility tests for the algorithm (2005)

Golonka, Piotr, Was, Zbigniew

In this note we will recall the main tests that document robustness and flexibility of the PHOTOS design. This aspect may be of broader use and may find extensions in future applications, also...

PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays (2005)

Golonka, Piotr, Was, Zbigniew

We present a discussion of the precision for the PHOTOS Monte Carlo algorithm, with improved implementation of QED interference and multiple-photon radiation. The main application of PHOTOS is the...

CP violation in B0_d --> tau+ tau- decays (2004)

Chankowski, Piotr H., Kalinowski, Jan, Was, Zbigniew, Worek, Malgorzata

Establishing CP violation in B0 (bar{B0}) --> l+ l- decays requires a measurement of polarization of the final lepton pair, or a precise determination of the B0 --> l+ l- and bar{B0} --> l+ l- rates....

Measuring the Higgs boson parity at a Linear Collider using the tau impact parameter and $\tau \to \rho \nu$ decay (2003)

Desch, Klaus, Was, Zbigniew, Worek, M

We demonstrate that a measurement of the impact parameter in one-prong tau decay can be useful for the determination of the Higgs boson parity in the H/A --> tau tau; tau --> rho nu decay chain. We...

Wavelet analysis of epileptic spikes (2003)

Latka, M, Was, Zbigniew, Kozik, A, West, B J

Interictal spikes and sharp waves in human EEG are characteristic signatures of epilepsy. These potentials originate as a result of synchronous, pathological discharge of many neurons. The reliable...

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...

Status report on TAUOLA, its environment, and its applications (2002)

Was, Zbigniew

The status of the Monte Carlo programs for the simulation of the tau-lepton production and decay in high energy accelerator experiments is reviewed. In particular, the status of the following...

MC-TESTER: a universal tool for comparisons of Monte Carlo predictions for particle decays in high energy physics (2002)

Golonka, Piotr, Pierzchala, T, Was, Zbigniew

Theoretical predictions in high energy physics are routinely provided in the form of Monte Carlo generators. Comparisons of predictions from different programs and/or different initialization set-ups...

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...

Measuring the Higgs boson's parity using $\tau \to \rho\nu$ (2002)

Bower, G R, Pierzchala, T, Was, Zbigniew, Worek, M

We present a very promising method for a measurement of the Higgs boson parity using the H/A -> tau^+ tau^- --> rho^+ nu rho^- nu --> pi^+ pi^0 nu pi^- pi^0 nu decay chain. The method is both model...

Spin polarization and the Einstein-Podolsky-Rosen paradox in the Monte Carlo event records (2002)

Was, Zbigniew

In the future high energy physics experiments, the question of properly matching the phenomenological programs that describe different parts of the physics processes (such as hard scattering,...

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...

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...

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...

TAUOLA the library for tau lepton decay, and KKMC/KORALB/KORALZ/... status report (2000)

Was, Zbigniew

The status of the Monte Carlo programs for the simulation of the $\tau$ lepton production in high energy accelerator experiments and decay is reviewed. In particular, the status of the following...

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: 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...

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

Kobel, Michael, Was, Zbigniew, Ainsley, C., Arbuzov, A., Arcelli, S., Bardin, D., ...

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...

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...

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...

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...

Library of SM and anomalous $WW\gamma$ couplings for the $e^{+}e^{-}\rightarrow f\overline{f} n\gamma$ Monte Carlo programs (1999)

Jacholkowska, A, Kalinowski, Jan, Was, Zbigniew

A brief description of the library of the Standard Model and anomalous WWgamma coupling contribution to the matrix element for e+e- -> \nu \bar{\nu} -> f \bar f n\gamma processes. A working example...

Library of anomalous $\tau\tau\gamma$ couplings for $\tau^{+} \tau^{-} (n \gamma)$ Monte Carlo programs (1999)

Paul, T, Swain, J D, Was, Zbigniew

We briefly describe a library that may be used with any e+ e- --> tau+ tau- (n gamma) Monte Carlo program to account for the effects of anomalous tau-tau-gamma couplings. The implementation of this...

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...

How to Generate Four-Fermion Phase Space (1999)

Skrzypek, Maciej, Was, Zbigniew

We present a scheme for integrating the matrix element of an arbitrary e^+e^-\to f_1f_2\bar f_3\bar f_4 process over the complete four-fermion phase space, or its any part, by means of the Monte...

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...

Monte Carlo program KoralW 1.42 for all four-fermion final states in $e^{+} e^{-}$ collisions (1998)

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

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...

Higher-order QED corrections to $e^{+}e^{-} \rightarrow \nu\overline{\nu}\gamma$ at LEP2 (1998)

Jacholkowska, A, Kalinowski, Jan, Was, Zbigniew

The process e+e- to nu barnu + gamma with a distinctive ``photon-plus-missing-energy'' signal can serve as an important tool to search for new physics at LEP2. It can be exploited to measure the WW...

Inclusion of $\tau$ anomalous magnetic and electric dipole moments in the KORALZ Monte Carlo (1998)

Paul, T, Was, Zbigniew

We describe modifications made to KORALZ version 4.03 in order to allow for anomalous magnetic and electric dipole moments of the tau. We discuss the verification of the method at LEP 1 energies.

Trefoil knot and ad hoc classification of elementary fields in the Standard Model (1997)

Was, Zbigniew

We present an arbitrary model based on the trefoil knot to construct objects of the same spectrum as that of elementary particles. It includes `waves' and three identical sets of sources. Due to...

Theoretical calculations of the Bhabha process (1997)

Jadach, Stanislaw, Melles, M, Placzek, Wiesiek, Richter-Was, Elzbieta, Skrzypek, Maciej, Ward, B F L, ...

$e^+ e^-$ 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...

Four-quark final state in W-pair production: Case of signal and background (1997)

Ishikawa, T, Kurihara, Y, Skrzypek, Maciej, Was, Zbigniew

We discuss theoretical predictions for W-pair production and decay at LEP2 and higher energies in a form suitable for comparison with raw data. We present a practical framework for calculating...

Precise calculations of the Bhabha process (1996)

Ward, B F L, Jadach, Stanislaw, Melles, M, Placzek, Wiesiek, Richter-Was, Elzbieta, Skrzypek, Maciej, ...

3rd International Symposium on Radiative Corrections (1996)

Jadach, Stanislaw, Skrzypek, Maciej, Was, Zbigniew

Upgrade of the Monte Carlo program BHLUMI for Bhabha scattering at low angles to version 4.04 (1996)

Jadach, Stanislaw, Placzek, Wiesiek, Richter-Was, Elzbieta, Ward, B F L, Was, Zbigniew

Higher-order radiative corrections to low-angle Bhabha scattering: the YFS Monte Carlo approach (1996)

Jadach, Stanislaw, Richter-Was, Elzbieta, Ward, B F L, Was, Zbigniew

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).

Monte Carlo program KORALW 1.02 for W-pair production at LEP2/NLC energies with Yennie-Frautschi-Suura exponentiation (1995)