Correlations between high-p_T and flavour physics (2009)
Squark and gluino decays are governed by the same mixing matrices as the contributions to flavour violating loop transitions of B-mesons. This allows for possible direct correlations between flavour...
Correlations between high-p_T and flavour physics (2009)
Squark and gluino decays are governed by the same mixing matrices as the contributions to flavour violating loop transitions of B-mesons. This allows for possible direct correlations between flavour...
Four statements about the fourth generation (2009)
Holdom, Bob, Hou, WS, Hurth, Tobias, Mangano, Michelangelo L, Sultansoy, Saleh, Ünel, Gokhan
Abstract This summary of the Workshop "Beyond the 3-generation SM in the LHC era" presents a brief discussion of the following four statements about the fourth generation: 1) It is not excluded by EW...
Flavour violating squark and gluino decays (2009)
We consider scenarios with large flavour violating entries in the squark mass matrices focusing on the mixing between second and third generation squarks. These entries govern both, flavour violating...
Flavour violating squark and gluino decays (2009)
We consider scenarios with large flavour violating entries in the squark mass matrices focusing on the mixing between second and third generation squarks. These entries govern both, flavour violating...
New physics search in the LHCb era (2008)
We present theoretical and experimental preparations for an indirect search for new physics using the rare decay $\bar B_d \to \bar K^* l^+ l^-$. We design new observables with very small theoretical...
New physics search in the LHCb era (2008)
We present theoretical and experimental preparations for an indirect search for new physics using the rare decay $\bar B_d \to \bar K^* l^+ l^-$. We design new observables with very small theoretical...
Constraints on New Physics in MFV models: a model-independent analysis of Delta F=1 processes (2008)
Hurth, Tobias, Isidori, Gino, Kamenik, Jernej F., Mescia, Federico
We analyse the constraints on dimension-six Delta F=1 effective operators in models respecting the MFV hypothesis, both in the one-Higgs doublet case and in the two-Higgs doublet scenario with large...
New observables in the decay mode $\overline{B}_d \to \overline{K}^{*0} l^{+}l^{-}$ (2008)
Egede, U, Hurth, Tobias, Matias, J, Ramon, M, Reece, W
We discuss the large set of observables available from the angular distributions of the decay anti-B --> anti-K*0 l+ l-. We present a NLO analysis of all observables based on the QCD factorization...
The Role of Collinear Photons in the Rare Decay $\overline{B} \to X_{s} l^+ l^-$ (2008)
Huber, T, Hurth, Tobias, Lunghi, E
We review the phenomenology of the rare decay \bar B -> X_s l+ l-. We present the results of a detailed phenomenological analysis and discuss the role of the decay in the search for new physics at...
SUSY Les Houches Accord 2 (2008)
Allanach, B C, Balázs, C, Bélanger, G, Bernhardt, M, Boudjema, F, Choudhury, D, ...
The Supersymmetry Les Houches Accord (SLHA) provides a universal set of conventions for conveying spectral and decay information for supersymmetry analysis problems in high energy physics. Here, we...
Huber, Tobias, Hurth, Tobias, Lunghi, Enrico
We study logarithmically enhanced electromagnetic corrections to the decay rate in the high dilepton invariant mass region as well as corrections to the forward backward asymmetry (FBA) of the...
Huber, Tobias, Hurth, Tobias, Lunghi, Enrico
We study logarithmically enhanced electromagnetic corrections to the decay rate in the high dilepton invariant mass region as well as corrections to the forward backward asymmetry (FBA) of the...
SCET sum rules for B->P and B->V transition form factors (2007)
De Fazio, F, Feldmann, T, Hurth, Tobias
We investigate sum rules for heavy-to-light transition form factors at large recoil derived from correlation functions with interpolating currents for light pseudoscalar or vector fields in...
On the Physics Case of a Super Flavour Factory (2007)
Browder, T, Ciuchini, M, Gershon, T, Hazumi, M, Hurth, Tobias, Okada, Y, ...
We summarize the physics case of a high-luminosity e+e- flavour factory collecting an integrated luminosity of 50-75 ab^(-1). Many New Physics sensitive measurements involving B and D mesons and tau...
Status of SM calculations of $b \to s$ transitions (2007)
We report recent progress in SM calculations of $b \to s$ transitions. We discuss the first NNLL prediction of the $\bar B \to X_s \gamma$ branching ratio, including important additional subtleties...
Status of SM calculations of b > s transitions (2007)
We report recent progress in SM calculations of $b \to s$ transitions. We discuss the first NNLL prediction of the $\bar B \to X_s \gamma$ branching ratio, including important additional subtleties...
Rare Decays as a Probe for New Physics (2006)
We discuss the indirect search for new degrees of freedom beyond the standard model, within flavour physics. In particular, we analyse the minimal flavour violation hypothesis and its...
Rare Decays as a Probe for New Physics (2006)
We discuss the indirect search for new degrees of freedom beyond the standard model, within flavour physics. In particular, we analyse the minimal flavour violation hypothesis and its...
Estimate of $BR(\overline{B} \to X_{s}\gamma)$ at $O(\alpha_{s^2})$ (2006)
Misiak, M, Asatrian, H M, Bieri, K, Czakon, M, Czarnecki, Andrzej, Ewerth, T, ...
Combining our results for various O(alpha_s^2) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order...
Asatrian, H M, Hovhannisyan, A, Pogosyan, V, Ewerth, T, Greub, C, Hurth, Tobias
We present an independent calculation of that part of the O(\alpha_s^2) contribution to the decay width \Gamma(\bar B -> X_s \gamma) which arises from the self-interference term of the...
Accomando, E, Azuelos, Georges, Baer, H, Balázs, C, Bélanger, G, Benakli, Karim, ...
The work contained herein constitutes a report of the "Beyond the Standard Model'' working group for the Workshop "Physics at TeV Colliders", Les Houches, France, 2-20 May, 2005. We present reviews...
Towards the NNLL precision in $\bar B \to X_s \gamma$ (2005)
Asatrian, H, Hovhannisyan, A, Pogosyan, V, Greub, C, Hurth, Tobias
The present NLL prediction for the decay rate of the rare inclusive process $\bar B \to X_s \gamma$ has a large uncertainty due to the charm mass renormalization scheme ambiguity. We estimate that...
Supersymmetry Parameter Analysis : SPA Convention and Project (2005)
Aguilar-Saavedra, J A, Ali, A, Allanach, Benjamin C, Arnowitt, R, Baer, H A, Bagger, J A, ...
High-precision analyses of supersymmetry parameters aim at reconstructing the fundamental supersymmetric theory and its breaking mechanism. A well defined theoretical framework is needed when...
New Physics Search in Flavour Physics (2005)
With the running B, kaon and neutrino physics experiments, flavour physics takes centre stage within today's particle physics. We discuss the opportunities offered by these experiments in our search...
New Physics Search in Flavour Physics (2005)
With the running B, kaon and neutrino physics experiments, flavour physics takes centre stage within today's particle physics. We discuss the opportunities offered by these experiments in our search...
Light-cone sum rules: A SCET-based formulation (2005)
De Fazio, F, Feldmann, T, Hurth, Tobias
We describe the construction of light-cone sum rules (LCSRs) for exclusive $B$-meson decays into light energetic hadrons from correlation functions within soft-collinear effective theory (SCET). As...
The $B \to \pi$ form factor from light-cone sum rules in soft-collinear effective theory (2005)
De Fazio, F, Feldmann, T, Hurth, Tobias
Recently, we have derived light-cone sum rules for exclusive B-meson decays into light energetic hadrons from correlation functions within soft-collinear effective theory. In these sum rules the...
Asatrian, H M, Greub, C, Hovhannisyan, A, Hurth, Tobias, Pogosyan, V
The uncertainty of the theoretical prediction of the $\bar B \to X_s \gamma$ branching ratio at NLL level is dominated by the charm mass renormalization scheme ambiguity. In this paper we calculate...
Light-cone sum rules in soft-collinear effective theory (2005)
De Fazio, F, Feldmann, T, Hurth, Tobias
We derive light-cone sum rules (LCSRs) for exclusive B-meson decays into light energetic hadrons from correlation functions within soft-collinear effective theory (SCET). In these sum rules the...
Light-cone sum rules in soft-collinear effective theory (2005)
De Fazio, Fulvia, Feldmann, Thorsten, Hurth, Tobias
We derive light-cone sum rules (LCSRs) for exclusive B-meson decays into light energetic hadrons from correlation functions within soft-collinear effective theory (SCET). In these sum rules the...
Physics Interplay of the LHC and the ILC (2004)
Weiglein, Georg, Barklow, T, Boos, E, De Roeck, A, Desch, Klaus, Gianotti, F, ...
Physics at the Large Hadron Collider (LHC) and the International e+e- Linear Collider (ILC) will be complementary in many respects, as has been demonstrated at previous generations of hadron and...
Non-factorizable Contributions to $B \to \pi\pi$ Decays (2004)
Feldmann, Thorsten, Hurth, Tobias
We investigate to what extent the experimental information on $B \to \pi\pi$ branching fractions and CP asymmetries can be used to better understand the QCD dynamics in these decays. For this purpose...
On the Landau Background Gauge Fixing and the IR Properties of YM Green Functions (2004)
Grassi, Pietro A, Hurth, Tobias, Quadri, A
We analyse the complete algebraic structure of the background field method for Yang--Mills theory in the Landau gauge and show several structural simplifications within this approach. In particular...
Untagged $B \to X_{(s+d)}$ gamma CP asymmetry as a probe for new physics (2003)
Hurth, Tobias, Lunghi, E, Porod, Werner
The direct CP asymmetry in the untagged inclusive channel B -> X_(s+d) gamma provides a strict test of the standard model. It has been shown beyond the partonic level that this asymmetry is...
Ghinculov, A, Hurth, Tobias, Isidori, Gino, Yao, Y P
We present a new phenomenological analysis of the inclusive rare decay $B \to X_s \ell^+\ell^-$. In particular, we present the first calculation of the NNLL contributions due to the leading two-loop...
Non-diagonal flavour observables in B and Collider Physics (2003)
Until now the focus within the direct search for supersymmetry has mainly been on flavour diagonal observables. Recently lepton flavour violating signals at future electron positron colliders have...
Updated NLL Results for $B \to (Xs,Xd) \gamma$ in and beyond the SM (2003)
Hurth, Tobias, Lunghi, E, Porod, Werner
We present general model-independent formulae for the branching ratios and the direct tagged CP asymmetries for the inclusive B -> Xd gamma and B -> Xs gamma modes. We also update the corresponding...
New NNLL Results on the Decay $B \to X_{s} L^+ L^-$ (2003)
Ginculov, A, Hurth, Tobias, Isidori, Gino, Yao, Y P
We present here new NNLL predictions on the inclusive rare decay B --> X(S) L+ L- based on our new two-loop QCD analysis of the four-quark operators.
On Exclusive and Inclusive Rare B Decays: CKM Phenomenology and New Physics Reach (2003)
We report recent results in rare B decays. Our focus will be on b -> d gamma and b -> s l^+ l^- transitions. We discuss their impact on the CKM phenomenology and their role within our search for new...
Comments on the Gauge Fixed BRST Cohomology and the Quantum Noether Method (2003)
Barnich, G, Hurth, Tobias, Skenderis, K
We discuss in detail the relation between the gauge fixed and gauge invariant BRST cohomology. In particular in certain gauges some cohomology classes of the gauge fixed BRST differential do not...
Super Background Field Method for N=2 SYM (2003)
Grassi, P A, Hurth, Tobias, Quadri, A
The implementation of the Background Field Method (BFM) for quantum field theories is analysed within the Batalin-Vilkovisky (BV) formalism. We provide a systematic way of constructing general...
Present Status of Inclusive Rare $B$ Decays (2002)
We give a status report on inclusive rare B decays, highlighting recent developments and open problems. We focus on the decay modes $B \to X_{s,d} \gamma$, $ B \to X_s \ell^+\ell^-$ and $B \to X_s...
NNLL QCD Corrections to the Decay $B \to X_s \ell^+ \ell^-$ (2002)
Ghinculov, A, Hurth, Tobias, Isidori, Gino, Yao, Y P
We briefly discuss the status of the NNLL QCD calculations in the inclusive rare $B$ decay $B \rightarrow X_s \ell^+ \ell^-$. Two important ingredients, the two-loop matrix elements of the four quark...
Forward-Backward Asymmetry in $B \to X_{s} l^{+} l^{-}$ (2002)
Ghinculov, A, Hurth, Tobias, Isidori, Gino, Yao, Y P
We report the results of a new calculation of soft-gluon corrections in B -> X_s l^+ l^- decays. In particular, we present the first calculation of bremsstrahlung and corresponding virtual terms to...
Measurement of the Width difference of $B_{d}$ mesons (2002)
Dighe, A S, Hurth, Tobias, Kim, C S, Yoshikawa, T
We estimate \Delta Gamma_d/\Gamma_d, including 1/m_b contributions and part of the next-to-leading order QCD corrections, and find it to be around 0.3%. We show the methods to measure \Delta...
The Width difference of $B_{d}$ mesons (2001)
Dighe, Amol S, Hurth, Tobias, Kim, C S, Yoshikawa, T
We estimate $\dg/\Gamma_d$, including $1/m_b$ contributions and part of the next-to-leading order QCD corrections. We find that adding the latter corrections decreases the value of $\dg/\Gamma_d$...
A new model-independent analysis of $B \to X_{s\gamma}$ in supersymmetry (2001)
Besmer, T, Greub, C, Hurth, Tobias
Using the example of the rare decay $B \to X_s \gamma$, we analyse the importance of interference effects for the bounds on the parameters in the squark mass matrices within the unconstrained MSSM....
Measurement of the Lifetime Difference of $B_d$ Mesons: Possible and Worthwhile? (2001)
Dighe, A S, Hurth, Tobias, Kim, C S, Yoshikawa, T
We estimate the decay width difference $\Delta Gamma_d / \Gamma_d$ in the $B_d$ system including $1/m_b$ contributions and next-to-leading order QCD corrections, and find it to be around 0.3%. We...
Direct CP Violation In Radiative B Decays (2001)
We discuss the role of the radiative B decays $B \to X_{s/d} \gamma$ in our search for new physics focusing on the issue of direct CP violation. We discuss in some detail a SM prediction for the CP...
Kaon physics with a high-intensity proton driver (2001)
Belyaev, A, Buchalla, Gerhard, Ceccucci, Augusto, Chizhov, M V, D'Ambrosio, G, Dorokhov, A E, ...
We study opportunities for future high-precision experiments in kaon physics using a high-intensity proton driver, which could be part of the front-end of a muon storage ring complex. We discuss in...
Inclusive Rare B Decays (2001)
We review the present status of rare B decays, focusing on inclusive decay modes and their role in our search for new physics. We also briefly discuss direct CP violation in rare B decays and the...
Bounds on flavour violating parameters in supersymmetry (2001)
Besmer, T, Greub, Christoph, Hurth, Tobias
We investigate the constraints on the flavour violating parameters from the decay B --> X_s gamma, taking into account the interplay of the various sources of flavour violation in the unconstrained...
CP Asymmetries in $b \to (s/d)$ Transitions as a Test of CKM CP Violation (2001)
We point out that a simple test of the mechanism of CP violation can be performed by a measurement of the CP asymmetries in exclusive and inclusive radiative rare decays. We show that the rate...
Present and Future CP Measurements (2001)
Hurth, Tobias, Kim, C S, Shepherd-Themistocleous, C H, Wilson, F F, Azfar, F, Barlow, R, ...
We review theoretical and experimental results on CP violation summarizing the discussions in the working group on CP violation at the UK phenomenology workshop 2000 in Durham.
Present and Future CP Measurements (2001)
Hurth, Tobias, Kim, Choong Sun, Shepherd-Themistocleous, Claire, Wilson, Fergus, Azfar, Farrukh, Barlow, Roger, ...
We review theoretical and experimental results on CP violation summarizing the discussions in the working group on CP violation at the UK phenomenology workshop 2000 in Durham.
Grassi, P A, Hurth, Tobias, Steinhauser, M
Combining the effect of an intermediate renormalization prescription (zero momentum subtraction) and the background field method (BFM), we show that the algebraic renormalization procedure needed for...
On the two-loop electroweak amplitude of the muon decay (2001)
We present an analysis of the two-loop amplitude of the muon decay in the Standard Model (SM) using algebraic renormalization techniques. In addition, we discuss a manifestly BRST invariant IR...
The Width Difference of $B_d$ Mesons (2001)
Dighe, Amol, Hurth, Tobias, Kim, Choong Sun, Yoshikawa, Tadashi
We estimate $\dg/\Gamma_d$, including $1/m_b$ contributions and part of the next-to-leading order QCD corrections. We find that adding the latter corrections decreases the value of $\dg/\Gamma_d$...
Non-invariant two-loop counterterms for the three-gauge-boson vertices (2000)
Grassi, P A, Hurth, Tobias, Steinhauser, M
Some practical applications of algebraic renormalization are discussed. In particular we consider the two-loop QCD corrections to the three-gauge-boson vertices involving photons, Z and W bosons. For...
Indirect search for supersymmetry in rare B decays (1999)
Greub, Christoph, Hurth, Tobias, Wyler, D
QCD corrections to the gluino induced contribution to b --> s gamma are shown to be important in order to extract reliable bounds on the off-diagonal elements of the squark mass matrices.
Gluino-Mediated Rare B Decays (1999)
We discuss the gluino-induced contribution to rare B decays in supersymmetric frameworks with generic sources of flavour change.
Borzumati, Francesca M, Greub, Christoph, Hurth, Tobias, Wyler, D
The gluino-induced contributions to the decay b-> s gamma are investigated in supersymmetric frameworks with generic sources of flavour violation. It is shown that, when QCD corrections are taken...
Cohomological analysis of gauged-fixed gauge theories (1999)
Barnich, G, Henneaux, M, Hurth, Tobias, Skenderis, K
The relation between the gauge-invariant local BRST cohomology involving the antifields and the gauge-fixed BRST cohomology is clarified. It is shown in particular that the cocycle conditions become...
Virtual $O(\a_s)$ corrections to the inclusive decay $b \to s \gamma$ (1996)
Greub, Christoph, Hurth, Tobias, Wyler, D.
We present in detail the calculation of the $O(\a_s)$ virtual corrections to the matrix element for $b \to s \g$. Besides the one-loop virtual corrections of the electromagnetic and color dipole...
Nonabelian gauge theories [microform] : the causal approach / (1994)
Thesis (doctoral)--Universität Zürich, 1994.