Townhall Hagen
Townhall in Hagen/Westfalen

Dr. habil. Stefan Groote


  • Postal Address:
    Tartu Ülikool (University of Tartu)
    Füüsika Instituut (Institute for Physics)
    Wilhelm Ostwaldi tn. 1 (Wilhelm Ostwald Str. 1)
    EE-50411 Tartu, Estonia
  • E-mail: groote@ut.ee
  • Office Number: B319
  • Phone number: (+372)7375573
Dr. Stefan Groote

"Mathematischer Vorkurs Frühjahr 2005" (in German)

My habilitation thesis (Habilitationsschrift)

pictures from the factulty reception of Marcus Mauser after his defense are now found on his own homepage!

instead: pictures of (parts of the) ThEP group taken for a present for Dirk Kreimer in occasion of his departure.

Reference to my PhD thesis (Dissertation)


About my doctoral time:

I have been a doctoral student at Prof. Dr. Jürgen G. Körner since 22th of August, 1994. The first subject of my thesis was the calculation of electron-positron-annihilation processes, resulting in polarized massive quarks. We calculated the first order contributions to the polarization using utilities like MATHEMATICA and various graphics programs. In this work we collaborated with Dr. Michael M. Tung, wo had made his PhD at Prof. Körner in 1993.

The second subject of my thesis, the anomalous dimension in the calculation of two-loop corrections to the mesonic and baryonic vertex, was result of a collaboration between Prof. Körner, Dr. Oleg I. Yakovlev and me. Using these results, we calculated first order radiative corrections to to the two-point correlator for the baryonic current related to this the radiative corrected diagonal and non-diagonal QCD sum rules.

On February 21, 1997, I passed my PhD examination with "magna cum laude".

About my postdoctoral time at the Universität Mainz:

Since March 1996 I co-attended the work of Dipl. Phys. Alfonso Leyva, PhD student at Prof. Körner, whos first subject was gluon polarization effects. For the second theme, namely the calculation of spin-spin correlations in electron-positron-annihilations into quarks and gluons, we were joined by Prof. Körner's PhD student Dipl. Phys. Volker Kleinschmidt since February until he left the Institute, since April by Dipl. Phys. Marcus Mauser.

In collaboration with Prof. Dr. Karl Schilcher and Prof. Dr. J. Körner I worked on the improvement for the accuracy of the QED coupling constant on the Z pole. We were joined by Dr. Alexei A. Pivovarov, who was guest at Mainz for several times. We extended the analysis to high order relations between physical observables as test for perturbative QCD and analyzed the resummation techniques in tau decays. We also searched for new calculation techniques for sunset diagrams. In this curse we were able to find some configuration space techniques to handle sunset-type diagrams, called water melons, and could reproduce the transcendental numbers obtained in the tetrahedron diagrams of three-loop bubbles within easier topologies. We shall continue the collaboration also be incorporating calculations on radiative corrections to massive baryonic correlators.

In summer 1997 and 1998, Dr. Andrei G. Grozin was guest at the ThEP working group. In cooperation with him we started a project for calculating electric and magnetic formfactors for massive quarks.

About my postdoctoral time at the Cornell University:

Made possible by a grant given by the Max Kade Foundation, on December 1st, 1998 I started a one-year postdoctoral study at the Cornell University, Ithaca, NY. I have started two new collaborations there. In the first one with Prof. Tung-Mow Yan I look for radiative corrections to relations between form factors for the semileptonic decay of heavy mesons which are given by effective theories like the HQET, the NRQCD (Non-relativistic Quantumchromodynamics) or the LEET (Large Energy Effective Theory). In collaboration with Prof. Peter Lepage and Dr. Junko Shigemitsu I work on an Symanzik improvement of the action for Lattice QCD for a corse, anisotropic lattice by calculating radiative corrections. I have refreshed this collaboration during a stay at Cornell University in August and September, 2000, as well as the collaboration with Oleg Yakovlev who moved to Ann Arbor, Michigan. In this collaboration we work on threshold mass definitions.

About my habilitation time at the Universität Mainz:

I started my habilitation at the Universität Mainz with my return from Cornell in December 1999. I gave a lecture about the Heavy Quark Effective Theory (HQET) during the Summer 2000 and a lecture "Einführung in die Quantenelektrodynamik (QED)" in Summer 2001. This lecture have been continued in Winter 2001/2002 as "Quantenelektrodynamik II". In July 2002 I submitted my thesis (518 pages) entitled "Bestimmung von Strahlungskorrekturen zur Physik schwerer Hadronen im Rahmen verschiedener effektiver Theorien" ("Calculation of Radiative Corrections within Heavy Hadron Physics for Different Effective Theories", in english) to the dean. After acception of my thesis, on July 23rd, 2003 I successfully passed my examination, giving a talk entitled "Rekonstruktion von Asteroidenbildung im Sonnensystem" ("Reconstruction of Asteroids' Formation in the Solar System"). My inaugural lecture was held on October 31st, 2003 (Reformation day) at 3pm in the nuclear physics building, the title was "Trichter und Schnecken - zur Physik des Ohres" ("Funnels and Snails - about the Ear's Physics"). It was open for everyone.

About my time as senior scientist at Tartu University:

Since January 2005 I am member of the field theory group at the Institute of Theoretical Physics at Tartu University, Estonia. The new branch of my research is stochastical physics. In collaboration with Prof. Christian Beck at the Queen Mary University, London I work on stochastic quantization and especially on coupled map lattices and spatio-temporal chaos. With Ph.D. Ilmar Ots, M.Sc. Hannes Liivat and Rein Saar from the Physics Institute in Tartu I am working on high spin physics. Starting from February 2006 I give lecture series at Tartu University in Estonian. In addition I have two master students, Priit Tuvike and Hardi Veermäe, who work on first order QCD and electroweak radiative corrections to the decay of the polarized W boson.

Lecture series at Tartu University


List of my publications:

  1. S. Groote, J.G. Körner, M.M. Tung (MZ-TH / 95-09):
    "Longitudinal contribution to the longitudinal polarization of quarks produced in electron-positron-annihilation: an O(alpha_s) effect", Z. Phys. C70 (1996) 281-290

  2. S. Groote, J.G. Körner (MZ-TH / 95-17):
    "Transverse polarization of top quarks produced in
    electron-positron-annihilation at O(alpha_s)", Z. Phys. C72 (1996) 255-261

  3. S. Groote, J.G. Körner, M.M. Tung (MZ-TH / 95-19):
    "Polar angle dependence of the alignment polarization of quarks produced in electron-positron-annihilation", Z. Phys. C74 (1997) 615-629

  4. S. Groote, J.G. Körner, O.I. Yakovlev (MZ-TH / 96-06):
    "Two-loop anomalous dimensions of heavy baryon currents
    in heavy quark effective theory", Phys. Rev. D54 (1996) 3447-3456

  5. S. Groote, J.G. Körner, O.I. Yakovlev (MZ-TH / 96-21):
    "QCD sum rules for heavy baryons at next-to-leading order in alpha_s",
    Phys. Rev. D55 (1997) 3016-3026

  6. S. Groote, J.G. Körner, J.A. Leyva (MZ-TH / 96-34):
    "Gluon polarization in electron-positron to top-antitop-gluon",
    Phys. Rev. D56 (1997) 6031-6034

  7. S. Groote, J.G. Körner, A.A. Pivovarov (MZ-TH / 97-03):
    "Resummation analysis of the tau decay width using the four-loop beta-function",
    Mod. Phys. Lett. A13 (1998) 637-650

  8. S. Groote, (MZ-TH / 97-05):
    "Two-loop anomalous dimensions of heavy baryon currents in heavy quark symmetry",
    Talk given on the 2nd Triangle School in Particle Physics,
    Prague, Czech Republic, September 2-10, 1996

  9. S. Groote, J.G. Körner, A.A. Pivovarov, K. Schilcher (MZ-TH / 97-09):
    "New high order relations between physical observables in perturbative QCD",
    Phys. Rev. Lett. 79 (1997) 2763-2766

  10. S. Groote, J.G. Körner, A.A. Pivovarov (MZ-TH / 97-16):
    "Perturbative relations between electron-positron annihilation and tau decay observables including resummation effects", Phys. Lett. 407 B (1997) 66-72

  11. S. Groote, J.G. Körner, J.A. Leyva (MZ-TH / 97-17):
    "Gluon polarization in electron-positron to electron-positron to top-antitop-gluon: polar angle dependence and beam polarization effects", Eur. Phys. J. C7 (1999) 49-59

  12. S. Groote, J.G. Körner, O.I. Yakovlev (MZ-TH / 97-19):
    "An analysis of diagonal and non-diagonal QCD sum rules for heavy baryons at next-to-leading order in alpha_s", Phys. Rev. D56 (1997) 3943-3954

  13. S. Groote, J.G. Körner, J.A. Leyva (MZ-TH / 97-27):
    "O(alpha_s) corrections to longitudinal spin-spin correlations in electron-positron to quark-antiquark", Phys. Lett. 418 B (1998) 192-198

  14. S. Groote (MZ-TH / 97-34):
    "Analyzing QCD sum rules for heavy baryons at next-to-leading order in alpha_s", Proceedings of the IVth International Workshop "Progress in Heavy Quark Physics", Rostock, September 20-22, 1997, pages 195-198

  15. S. Groote, J.G. Körner, J.A. Leyva (MZ-TH / 97-39):
    "On the rigidity of back-to-back top quark pairs in electron-positron annihilation",
    Nucl. Phys. B527 (1998) 3-20

  16. S. Groote, J.G. Körner, K. Schilcher, N.F. Nasrallah (MZ-TH / 98-02):
    "QCD sum rule determination of alpha(M_Z) with minimal data input",
    Phys. Lett. 440 B (1998) 375-385

  17. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 98-09):
    "On the evaluation of sunset-type Feynman diagrams", Nucl. Phys. B542 (1999) 515-547

  18. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 98-12):
    "A new technique for computing the spectral density of sunset-type diagrams: integral transformation in configuration space", Phys. Lett. 443 B (1998) 269-275

  19. M. Fischer, S. Groote, J.G. Körner and M.C. Mauser, B. Lampe (MZ-TH / 98-47):
    "Polarized top decay into polarized W", Phys. Lett. 451 B (1999) 406-413

  20. J.G. Körner and S. Groote (MZ-TH / 98-63):
    "Heavy Baryons: Status and overview (theory)", Invited talk given by J.G. Körner at the 8th International Conference on the Structure of Baryons (BARYONS'98), Bonn, Germany, 22-26 September 1998, published in the Proceedings "BARYONS '98", edited by D.W. Menze and B. Metsch (World Scientific, Singapore, 1999) pages 232-245.

  21. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 99-07, CLNS / 99-1606):
    "Configuration space based recurrence relations for sunset-type diagrams",
    Eur. Phys. J. C11 (1999) 279-292

  22. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 99-13, CLNS / 99-1613):
    "Transcendental numbers and the topology of three-loop bubbles",
    Phys. Rev. D60 (1999) 061701

  23. S. Groote (MZ-TH / 99-18, CLNS / 99-1619):
    "Local and global duality and the determination of alpha(M_Z)", Proceedings of the conference "High Energy Physics at the Millennium (MRST'99)", Ottawa, Canada, May 10-12, 1999, pages 124-131

  24. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 99-49, CLNS / 99-1647):
    "O(alpha_s) corrections to the correlator of finite mass baryon currents",
    Phys. Rev. D61 (2000) 071501

  25. M. Fischer, J.G. Körner, M.C. Mauser and S. Groote (MZ-TH / 99-27):
    "Inclusive decays of B mesons into D_s and D^* and D_s^* at O(alpha_s) including D_s^* polarization effects",
    Phys. Lett. 480 B (2000) 265-272

  26. S. Groote and J. Shigemitsu (MZ-TH / 99-64):
    "One-loop self energy and renormalization of the speed of light for some anisotropic inproved quark actions",
    Phys. Rev. D62 (2000) 014508

  27. S. Groote and A.A. Pivovarov (MZ-TH / 00-07):
    "Threshold expansion of Feynman diagrams within a configuration space technique", Nucl. Phys. B580 (2000) 459-484

  28. J.G. Körner and S. Groote (MZ-TH / 00-08):
    "Theory of Heavy Baryon Decay", Invited talk given by J.G. Körner at the 3rd International Conference on B Physics and CP Violation (BCONF99), Taipei, Taiwan, 3-7 Dec 1999, published in the Proceedings, edited by H.Y. Cheng and W.S. Hou (World Scientific, 2000).

  29. Stefan Groote (MZ-TH / 00-24):
    "QCD sum rules as applied to heavy baryons", Proceedings of the 5th International Conference on "Heavy Quark Physics", Dubna, Russia, April 6-8, 2000, p.26-30

  30. S. Groote and O.I. Yakovlev (MZ-TH / 00-33, CLNS / 00-1686):
    "Top quark mass definition and t anti-t production near threshold at the NLC", Phys. Rev. D63 (2001) 074012

  31. S. Groote and O.I. Yakovlev (MZ-TH / 00-36):
    "A dynamic mass definition near the t anti-t threshold", talk given by Stefan Groote at the Laboratory of Nuclear Studies, Cornell Univ., Ithaca, N.Y., 23 Aug 2000

  32. O.I. Yakovlev and S. Groote (MZ-TH / 00-38, CLNS / 00-1690):
    "Top quark production near threshold at NLC", talk given by Oleg Yakovlev at PHENO 2000: Symposium on Phenomenology for the Nu Century, Madison, Wisconsin, 17-19 Apr 2000

  33. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 00-41, CLNS / 00-1693):
    "Analytical calculation of heavy baryon correlators in NLO of perturbative QCD", contribution to the "VII International Workshop on Advanced Computing and Analysis Techniques in Physics Research (ACAT2000)", Fermi National Laboratory, Batavia, Illinois, USA, 16-20 Oct 2000, to appear in the Proceedings

  34. S. Groote, J.G. Körner and J.A. Leyva (MZ-TH / 00-41, CLNS / 00-1693):
    "O(alpha_s) corrections to the polar angle dependence of the longitudinal spin-spin correlation asymmetry in electron + positron -> quark + anti-quark"

  35. M. Fischer, S. Groote, J.G. Körner and M.C. Mauser (MZ-TH / 00-50):
    "Longitudinal, transverse plus and transverse minus W bosons in unpolarized top quark decays at O(alpha_s)", Phys. Rev. D63 (2001) 031501

  36. O.I. Yakovlev and S. Groote (MZ-TH / 00-57, MCTP-00-10):
    "On top anti-top threshold and top quark mass definition", talk given by Oleg Yakovlev on the Linear Collider Workshop 2000, Fermilab, October 2000, to appear in the Proceedings

  37. M. Fischer, S. Groote, J.G. Körner and M.C. Mauser (MZ-TH / 99-10):
    "Complete angular analysis of polarized top decay at O(alpha_s)", Phys. Rev. D65 (2002) 054036

  38. S. Groote and A.A. Pivovarov (MZ-TH / 01-06):
    "Low-energy gluon contributions to the vacuum polarization of heavy quarks", JETP Lett. 75 (2002) 221 [Pisma Zh. Eksp. Teor. Fiz. 75 (2002) 267]

  39. S. Groote and A.A. Pivovarov (MZ-TH / 01-10):
    "Heavy quark induced effective action for gauge fields in the SU(N_c) x U(1) model and the low-energy structure of heavy quark current correlators", Eur. Phys. J. C21 (2001) 133-143

  40. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 01-15):
    "Spectral moments of two-point correlators in perturbation theory and beyond", Phys. Rev. D65 (2002) 036001

  41. M. Fischler et al. (FERMILAB-CONF-01-237-T):
    Summaries of recent computer-assisted Feynman diagram calculations", prepared for the 7th International Workshop on Advanced Computing and Analysis Techniques in Physics Research (ACAT 2000), Batavia, Illinois, 16-20 Oct 2000

  42. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 01-31):
    "An interpolation of the vacuum polarization function for the evaluation of hadronic contributions to the muon anomalous magnetic moment", Eur. Phys. J. C24 (2002) 393-405

  43. M. Fischer, S. Groote, J.G. Körner and M.C. Mauser (MZ-TH / 02-03):
    "Leptonic mu and tau decays: mass effects, polarization effects and O(alpha) radiative corrections",
    Phys. Rev. D67 (2003) 067311

  44. H.S. Do, S. Groote, J.G. Körner and M.C. Mauser (MZ-TH / 01-03):
    "Electroweak and finite width corrections to top quark decays into transverse and longitudinal W-bosons", Phys. Rev. D67 (2003) 091501

  45. S. Groote (MZ-TH / 02-29):
    "Polarization effects in e+ e- annihilation processes"

  46. S. Groote (MZ-TH / 02-30):
    "The electron-positron annihilation cross section used for high precision tests of the Standard Model"

  47. S. Groote (MZ-TH / 03-10):
    "Lectures on configuration space methods for sunrise-type diagrams", invited lecture series given at the International Research Workshop "Calculations for Modern and Future Colliders (Calc2003)", June 13-21, 2003, Dubna, Russia

  48. M. Fischer, S. Groote, J.G. Körner and M.C. Mauser (MZ-TH / 03-06):
    "Semi-inclusive decays Lambda_b -> X_c + D_s^* at O(alpha_s) including Lambda_b and D_s^* polarization effects", Phys. Rev. D70 (2004) 094026

  49. S. Groote, J.G. Körner and J. Maul (MZ-TH / 03-14):
    "QCD improved determination of the hadronic contribution to the anomalous magnetic moment of the muon"

  50. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 04-03):
    "Laurent series expansion of sunrise-type diagrams using configuration space techniques", Eur. Phys. J. C36 (2004) 471-482

  51. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 05-08):
    "On the evaluation of a certain class of Feynman diagrams in x-space: Sunrise-type topologies at any loop order", Annals of Physics (2007)

  52. S. Groote, W.S. Huo, A. Kadeer and J.G. Körner (MZ-TH / 05-13):
    "Azimuthal correlation between the (p_l,p_Xb) and (p_l,P_t) planes in the semileptonic rest frame decay of a polarized top quark: An O(alpha_s) effect"

  53. S. Groote, M. Knodel (MZ-TH / 05-17):
    "Evaluating massive planar two-loop tensor vertex integrals", Eur. Phys. J. C46 (2006) 157-178

  54. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 06-06):
    "Large next-to-leading order QCD corrections to pentaquark sum rules", Phys. Rev. D74 (2006) 017503

  55. S. Groote and C. Beck (MZ-TH / 06-07):
    "Scaling behavior of non-hyperbolic coupled map lattices", Phys. Rev. E74 (2006) 046216

  56. S. Groote and C. Beck (MZ-TH / 06-09):
    "Scaling properties of invariant densities of coupled Chebyshev maps", Dyn. Sys. 22(2) (2007) 219-248

  57. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 07-20):
    "Next-to-Leading Order perturbative QCD corrections to baryon correlators in matter", Phys. Rev. D78(3) (2008) 034039

  58. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 07-21):
    "Heavy baryon properties with NLO accuracy in perturbative QCD", Eur. Phys. J. C58(3) (2008) 355-382

  59. S. Groote and H. Veermäe (MZ-TH / 08-11):
    "Short chaotic strings and their behaviour in the scaling region", Chaos, Solitons and Fractals 41(5) (2005) 2354-2359

  60. S. Groote and J.G. Körner (MZ-TH / 98-23, superseded by MZ-TH / 08-39):
    "Analytical results for O(alpha_s) radiative corrections to electron-positron annihilation into antitop and polarized top up to a given energy cut", Phys. Rev. D80(3) (2009) 034001

  61. S. Groote, J.G. Körner and J.A. Leyva (MZ-TH / 00-49, superseded by MZ-TH / 09-18):
    "O(alpha_s) corrections to the polar angle dependence of the longitudinal spin-spin correlation asymmetry in e^+ e^- -> q q-bar", Eur. Phys. J. C63(3) (2009) 391-406

  62. S. Groote, H. Liivat, I. Ots and T. Sepp (MZ-TH / 09-29):
    "Probing scalar particle and unparticle couplings in e+ e- -> t tbar with transversely polarized beams", Eur. Phys. J. C66(1) (2010) 271-281

  63. S. Groote, J.G. Körner (MZ-TH / 09-42):
    "O(alpha(s)) spin effects in e+ e- ---> q anti-q (g)", Proceedings of 13th Workshop on High Energy Spin Physics (DSPIN-09), Dubna, Moscow Region, Russia, 1-5 Sep 2009

  64. R. Saar, S. Groote, H. Liivat and I. Ots (MZ-TH / 10-20):
    "Gauge and Lorentz transformation placed on the same foundation", Adv. Math. Phys. 2011 (2011) 652126

  65. S. Groote, H. Liivat and I. Ots (MZ-TH / 10-29):
    "Symmetries and similarities for spin orientation parameters in e^+ e^- -> ZH, Z\gamma, ZZ at SM thresholds", Nucl. Phys. B843 (2011) 213-222

  66. S. Groote, J.G. Körner, B. Melić and S. Prelovsek (MZ-TH / 10-47):
    "A survey of top quark polarization at a polarized linear e^+ e^- collider", Phys. Rev. D83 (2011) 054018

  67. R. Saar, S. Groote, H. Liivat and I. Ots (MZ-TH / 09-30):
    "`Dynamical' interactions and gauge invariance", Phys. Rev. D84(6) (2011) 065022

  68. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 11-17):
    "Calculation loops without loop calculations: NLO computation of pentaquark correlators", Phys. Rev. D86(3) (2012) 034023

  69. S. Groote and J.G. Körner (MZ-TH / 11-45):
    "Quark polarization at a polarized linear e^+ e^- collider", Proceedings of the conference DSPIN-11, Dubna, Russia, Sept 20-24, 2011

  70. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 12-15):
    "A numerical test of differential equations for one- and two-loop sunrise diagrams using configuration space techniques", Eur. Phys. J. C72(7) (2012) 2085

  71. S. Groote, J.G. Körner and P. Tuvike (MZ-TH / 12-16):
    "O(alpha_s) corrections to the decays of polarized W^+- and Z bosons into massive quark pairs", Eur. Phys. J. C72(10) (2012) 2177

  72. S. Groote, H. Veermäe and C. Beck (MZ-TH / 12-35):
    "Renormalization group approach to chaotic strings", Chaos, Solitons & Fractals 53 (2013) 18-33

  73. S. Groote, J.G. Körner, B. Melić and S. Prelovsek (MZ-TH / 12-41):
    "Single top quark polarization at O(alpha_s) in t t-bar production at a polarized linear e^+ e^- collider", extended version of a talk given at the LC Forum Munich 2011, to be published as a DESY-123 LC review report

  74. S. Groote, J.G. Körner and A.A. Pivovarov (MZ-TH / 12-53):
    "Understanding perturbative results for decays of tau leptons into hadrons", contribution to the Festschrift published on the occasion of the 60th birthday of Dmitri Kazakov, Phys. Part. Nucl. 44 (2013) 285--298

  75. S. Groote, J.G. Körner and P. Tuvike (MZ-TH / 12-55):
    "Fully analytical O(alpha_s) results for on-shell and off-shell polarized W-boson decays into massive quark pairs", Eur. Phys. J. C73 (2013) 2454

  76. S. Groote, J.G. Körner and P. Tuvike (MITP / 13-009):
    "The decays of on-shell and off-shell polarized gauge bosons into massive quark pairs at NLO QCD", invited talk given by J.G. Körner at the 20th International Symposium on Spin Physics, September 17-22, 2012, Dubna Russia. Published in the Proceedings, Phys. Part. Nucl. 45 (2014) 214-216

  77. S. Groote, J.G. Körner and D. Niinepuu (MITP / 14-003):
    "Perturbative O(alpha_s) corrections to the correlation functions of light tetraquark currents", Phys. Rev. D90 (2014) 054028

  78. L. Kaldamäe and S. Groote (MITP / 14-032):
    "Virtual and real processes, the Källén function, and the relation to dilogarithms", J. Phys. G42 (2015) 085003

  79. S. Groote, H. Veermäe and C. Beck:
    "Renormalization aspects of chaotic strings", talk given at the conference "QQQ12 - 3Quantum: Algebra Geometry Information", Tallinn, Estonia, July 10-14, 2012, J. Phys. Conf. Ser. 532 (2014) 012008

  80. S. Groote and R. Saar:
    "Group theory aspects of chaotic strings", talk given at the conference "QQQ12 - 3Quantum: Algebra Geometry Information", Tallinn, Estonia, July 10-14, 2012, J. Phys. Conf. Ser. 532 (2014) 012006

  81. S. Groote, R. Saar and H. Liivat:
    "Lorentz invariance and gauge equivariance", talk given at the conference "QQQ12 - 3Quantum: Algebra Geometry Information", Tallinn, Estonia, July 10-14, 2012, J. Phys. Conf. Ser. 532 (2014) 012007

  82. S. Berge, S. Groote, J.G. Körner and Lauri Kaldamäe (MITP / 15-034):
    "Lepton-mass effects in the decays H -> ZZ* -> l+ l- tau+ tau- and H -> WW* -> l nu tau nu_tau", Phys. Rev. D92 (2015) 033001

  83. R. Saar and S. Groote (MITP / 16-055):
    "Mass, zero mass and ... nophysics", Adv. Appl. Clifford Algebras 27 (2017) 2739

  84. L. Kaldamäe, S. Groote and J.G. Körner (MITP / 16-057):
    "Analytical O(alpha_s) corrections to the beam frame double-spin density matrix elements of e+ e- -> t tbar", Phys. Rev. D94 (2016) 114003

  85. Sergey Koshkarev and Stefan Groote (arXiv:1611.08149):
    "Double quarkonium production at high Feynman-x", Nucl. Phys. B915 (2017) 384-391

  86. Stefan Groote and Sergey Koshkarev (arXiv:1704.02850):
    "Production of doubly charmed baryons nearly at rest", Eur. Phys. J. C77 (2017) 509

  87. Stanley J. Brodsky, Stefan Groote and Sergey Koshkarev (arXiv:1709.09903):
    "Resolving the SELEX--LHCb Double-Charm Baryon Conflict: The Impact of Intrinsic Heavy-Quark Hadroproduction and Supersymmetric Light-Front Holographic QCD", submitted to Eur. Phys. J. C

  88. Stefan Groote and Jürgen G. Körner (MITP-17 / 072):
    "Bread and butter physics: NLO electroweak corrections to polarized top quark decays", Contribution to the proceedings of the XVII Workshop on High Energy Spin Physics DSPIN-17, September 11-15, Dubna (Russia): Journal of Physics, Conference Series 938 (2018) 012053

  89. Stefan Groote and Jürgen G. Körner (MITP-17 / 084):
    "Positivity bound on the imaginary part of the right-chiral tensor coupling g_R in polarized top quark decay", Phys. Rev. D96 (2017) 111301

  90. Sergey Koshkarev and Stefan Groote (arXiv:1711.07252):
    "Signals of the double intrinsic heavy quark at the current experiments", Contribution to the proceedings of the XVII Workshop on High Energy Spin Physics DSPIN-17, September 11-15, Dubna (Russia): Journal of Physics, Conference Series 938 (2018) 012054

  91. M. Fischer, S. Groote and J.G. Körner (MITP-18 / 002):
    "T-odd correlations in polarized top quark decays in the sequential decay $t(\uparrow)\to X_b+W++(\ell^+\nu_\ell)$ and in the quasi-three-body decay $t(\uparrow)\to X_b+\ell^++\nu_\ell", Phys. Rev. D97 (2018) 093001

  92. A. Czarnecki, S. Groote, J.G. Körner and J.H. Piclum, (MITP-18 / 008):
    "NNLO QCD corrections to the polarized top quark decay $t(\uparrow)\to X_b+W^+$", Phys. Rev. D97 (2018) 094008

  93. Sergey Koshkarev and Stefan Groote (arXiv:1803.07034):
    "Analysis of the baryonic state |[qc]c\rangle", submitted to Nucl. Phys. B

  94. S. Groote and J.G. Körner (MITP-18 / 032):
    "Coordinate space calculation of two- and three-loop sunrise-type diagrams, elliptic functions and truncated Bessel integral identities"

I love Hagen, the town I am born in 1963, although visitors told me that it is ugly and not as representative as other towns in the Ruhrgebiet like e.g. Dortmund, my former place of studies. To give you a small insight in my town, I display a picture of our townhall, only twenty years old. I have painted it for the "Kirchentag im Ruhrgebiet" in 1991, when tenthousands of children came to Hagen to see the Musical "Zack" there. Because of this favour for my town I frequently use the Deutsche Bahn to get from here to there. But on holidays, my favorite country is Sweden or Sverige. After my engagement with Edith Vohu from Tartu on August 12th, 2001, or registration on August 13th, 2003, the birth of our daughter Linda-Reet on January 24th, 2004 and Ediths and my marriage on August 28th, 2004 you will find us more or less in Estonia. On January 1st, 2006 our second daughter Elo-Maarja was born. So be aware to meet me in Tartu (earlier name: Dorpat) at Tartu Ülikoolil!

My hobbies are the following:


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© by Stefan Groote, 03.05.2018