Staff profile

• Particle Physics (Flavour Physics, CP violation, New Physics)

• Elementary Particle Theory

• 2020: IPPP Consolidated Grant 2019(£3785809.64 from Ernest Rutherford Fellowship)

Chapter in book

• Lenz, Alexander (2015). Lifetimes and Heavy Quark Expansion. In QCD and Heavy Quarks: In Memoriam Nikolai Uraltsev. Bigi, Ikaros, Gambino, Paolo & Mannel, Thomas New Jersey: World Scientific. 63-109.

Conference Paper

• Lenz, Alexander (2016), Theory Overview, in Lenz, Alexander & Carbone, Angelo eds, VIII International Workshop On Charm Physics (CHARM 2016). Bologna, Italy, International School for Advanced Studies (SISSA), PoS(CHARM2016)003.
• Lenz, Alexander (2014), B-mixing in and beyond the standard model, CKM 2014. Vienna, Vienna.
• Lenz, Alexander (2014), Bs-antiBs mixing and lifetimes, PoS Beauty2014 (2014) 002 BEAUTY 2014: The 15th International Conference on B-Physics at Frontier Machines at the University of Edinburgh. Edinburgh, Edinburgh.
• Lenz, Alexander (2012), Theoretical update of $B$-Mixing and Lifetimes, Moriond Electroweak 2012 and CERN. Nikhef, Trento, Nikhef, Trento.
• Bobrowski, Markus, Lenz, Alexander & Rauh, Thomas (2012), Short distance D-Dbar mixing, 5th International Workshop on Charm Physics, Honolulu, Hawai’i, May 14–17, 2012. Honolulu, Hawai’i, Honolulu HI.
• Kreps, Michal, Lenz, Alexander & Leroy, Olivier (2011), Summary of WG4: 'Lifetime, Mixing and Weak Mixing Phase in Charm and Beauty, Including Direct Determination of V_tx, CKM unitarity triangle 6th International Workshop, CKM 2010, Warwick, UK, 6-10 September 2010. Warwick, UK, INSPIRE, Warwick.
• Lenz, Alexander (2011), CKM theory status, in Soffer, A. eds, Proceedings of the 9th International Conference on Flavor Physics and CP Violation, FPCP 2011 9th International Conference on Flavor Physics and CP Violation, FPCP 2011. Tel Aviv, Israel, Tel Aviv.
• Lenz, Alexander & Nierste, Ulrich (2011), Numerical Updates of Lifetimes and Mixing Parameters of B Mesons, in Gershon, Tim eds, CKM unitarity triangle 6th International Workshop, CKM 2010, Warwick, UK, 6-10 September 2010. Warwick, UK, INSPIRE, Warwick.
• Lenz, Alexander & Bobrowski, Markus (2011), Standard Model Predictions for D0-oscillations and CP-violation, 02: World Scientific, 117-121.
• Lenz, Alexander, Pas, Heinrich & Schalla, Dario (2010), Constraints on fourth generation Majorana neutrinos, 259: IOP Publishing.
• Bobrowski, Markus & Lenz, Alexander (2010), Charm mixing in the Standard Model, ICHEP2010: SISSA.
• Braun, V.M., Ivanov, D. Yu., Lenz, A. & Peters, A. (2009), Threshold pion electroproduction at large momentum transfers, CD09: 057.
• Braun, V.M., Ivanov, D. Yu., Lenz, A. & Peters, A. (2009), Threshold Pion Production at Large Momentum Transfers, in Tserruya, I., Gal, A. & Ashery, D. eds, Proceedings of the Eighteenth Particles and Nuclei International Conference: PANIC08, Eilat, Israel, 9-14 November, 2008. Eilat, Israel, Elsevier, Eilat, 294-296.
• Lenz, Alexander (2008), Theoretical status of Bs-mixing and lifetimes of heavy hadrons, in Castaldi, R., Chiarelli, G., Forti, F & Scribano, A. eds, 177-178: Hadron Collider Physics Symposium 2007. La Biodola, Isola d’Elba, Italy, Elsevier, 81-86.
• Lenz, Alexander (2008), The theoretical status of B¯ − B-mixing and lifetimes of heavy hadrons, 23: World Scientific, 3321-3328.
• Lenz, Alexander J. (2008), Mixing and lifetimes of $b-$hadrons, 1026: American Institute of Physics, 36-47.
• Lenz, Alexander J. (2008), Search for new physics in $B_s$ -mixing, in Peloso, M. eds, Proceeding of the conference Continuous Advances in QCD 2008 8th Workshop on Continuous Advances in QCD (Quantum Chromodynamics). University of Minnesota, USA, World Scientific, University of Minnesota, 70-78.
• Lenz, Alexander (2007), Lifetimes and oscillations of heavy mesons, in Recksiegel, S., Hoang, A. & Paul, S. eds, eConf C0610161: International Conference on Heavy Quarks and Leptons, 8th International Workshop. Munich, Deutsches Museum, Munich, 421-436.
• Lenz, Alexander (2007), Form factors of baryons within the framework of light-cone sum rules, in Colangelo, P., Creanza, D., DeFazio, F., Fini, R.A., Nappi, E. & Nardulli, G. eds, 964: International Workshop on Quantum Chromodynamics Theory and Experiment. Martina Franca, American Institute of Physics, New York, 77-83.
• Lenz, Alexander (2004), Decay rate difference in the neutral B-system: Delta gamma (B(s) and delta gamma(B(d), Flavor Physics & CP Violation 2004 (FPCP 2004). Daegu, Korea.
• Barbiero, et al & Lenz, Alexander (2002), CKM elements from tree-level B decays and lifetimes.
• Braun, Vladimir,, Fries, Rainer,, Mahnke, Nils, Lenz, Alexander & Stein, Eckart (2002), Soft contribution to the nucleon electromagnetic form-factors, Baryons 2002. Virginia, Virginia.
• Lenz, Alexander (2001), Theoretical status of the lifetime predictions: (ΔΓ/Γ)Bs, τB+/τBd and τΛb/τBd, in Wu, Yue-Liang eds, Proceedings of the ICFP2001 nternational Conference on Flavor Physics (ICFP) 2001. Hunan, World Scientific, Singapore, 291-296.
• Lenz, Alexander (2000), Some comments on the missing charm puzzle, UK Phenomenology Workshop on Heavy Flavor and CP Violation. Durham.
• Lenz, Alexander (1998), Next-to-leading order QCD corrections to the lifetime difference of B(s) mesons, Proceedings of Science 042: Corfu Summer Institute on Elementary Particle Physics 1998. Corfu, Corfu.

Conference Proceeding

• Lenz, Alexander & Willocq, Stephane (2001). Mixing and lifetimes summary.
• Braun, Vladimir, Lenz, Alexander, Stein, Eckart, Schafer, Andreas & Beneke, Martin (2001). Exclusive B decays. Exclusive B decays, Regensburg.

Journal Article

• Lenz, Alexander, Piscopo, Maria Laura & Rusov, Aleksey V. (2020). Contribution of the Darwin operator to non-leptonic decays of heavy quarks. Journal of High Energy Physics 2020(12): 199.
• Lenz, Alexander & Tetlalmatzi-Xolocotzi, Gilberto (2020). Model-independent bounds on new physics effects in non-leptonic tree-level decays of B-mesons. Journal of High Energy Physics 2020(7): 177.
• Jäger, Sebastian, Kirk, Matthew, Lenz, Alexander & Leslie, Kirsten (2020). Charming new B-physics. Journal of High Energy Physics 2020(3): 122.
• Di Luzio, Luca, Kirk, Matthew, Lenz, Alexander & Rauh, Thomas (2019). ∆Ms theory precision confronts flavour anomalies. Journal of High Energy Physics 2019(12): 9.
• King, Daniel, Lenz, Alexander & Rauh, Thomas (2019). Bs mixing observables and |Vtd/Vts| from sum rules. Journal of High Energy Physics 2019(5): 34.
• Lenz, Alexander (2019). Charming clue for our existence. Nature Reviews Physics 1(6): 365-366.
• Di Luzio, Luca, Kirk, Matthew & Lenz, Alexander (2018). Updated Bs -mixing constraints on new physics models for b→sℓ+ℓ− anomalies. Physical Review D 97(9): 095035.
• Lenz, Alexander, Spannowsky, Michael & Tetlalmatzi-Xolocotzi, Gilberto (2018). Double-charming Higgs boson identification using machine-learning assisted jet shapes. Physical Review D 97(1): 016001.
• Kirk, M., Lenz, A. & Rauh, T. (2017). Dimension-six matrix elements for meson mixing and lifetimes from sum rules. Journal of High Energy Physics 2017(12): 68.
• Jubb, Thomas, Kirk, Matthew & Lenz, Alexander (2017). Charming dark matter. Journal of High Energy Physics 2017(12): 10.
• Jubb, Thomas, Kirk, Matthew & Lenz, Alexander (2017). On the ultimate precision of meson mixing observables. Nuclear Physics B 915: 431-453.
• Brod, Joachim, Lenz, Alexander, Tetlalmatzi-Xolocotzi, Gilberto & Wiebusch, Martin (2015). New physics effects in tree-level decays and the precision in the determination of the quark mixing angle γ. Physical Review D 92(3): 033002.
• Lenz, Alexander (2015). Lifetimes and heavy quark expansion. International Journal of Modern Physics A 30(10): 1543005.
• Artuso, Marina, Borissov, Guennadi & Lenz, Alexander (2015). CP violation in the B0s system. Reviews of Modern Physics 88(4): 045002.
• Bobeth, Christoph, Haisch, Ulrich, Lenz, Alexander, Pecjak, Ben & Tetlalmatzi-Xolocotzi, Gilberto (2014). On new physics in Delta Gammad. Journal of High Energy Physics 2014(6): 40.
• Bicer, M., DuranYildiz, H., Yildiz, I., Coignet, G., Delmastro, M., Alexopoulos, T., Grojean, C., Antusch, S., Sen, T., He, H-J., Potamianos, K., Haug, S., Moreno, A., Heister, A., Sanz, V., Gomez-Ceballos, G., Klute, M., Zanetti, M., Wang, L.-T., Dam, M., Boehm, C., Glover, N., Krauss, F., Lenz, A., Syphers, M., Leonidopoulos, C., Ciulli, V., Lenzi, P., Sguazzoni, G., Antonelli, M., Boscolo, M., Dosselli, U., Frasciello, O., Milardi, C., Venanzoni, G., Zobov, M., vanderBij, J., deGruttola, M., Kim, D.-W., Bachtis, M., Butterworth, A., Bernet, C., Botta, C., Carminati, F., David, A., Deniau, L., d’Enterria, D., Ganis, G., Goddard, B., Giudice, G., Janot, P., Jowett, J.M., Lourenço, C., Malgeri, L., Meschi, E., Moortgat, F., Musella, P., Osborne, J.A., Perrozzi, L., Pierini, M., Rinolfi, L., deRoeck, A., Rojo, J., Roy, G., Sciabà, A., Valassi, A., S.Waaijer, C., Wenninger, J., Woehri, H., Zimmermann, F., Blondel, A., Koratzinos, M., Mermod, P., Onel, Y., Talman, R., CastanedaMiranda, E., Bulyak, E., Porsuk, D., Kovalskyi, D., Padhi, S., Faccioli, P., Ellis, J.R., Campanelli, M., Bai, Y., Chamizo, M., Appleby, R.B., Owen, H., MauryCuna, H., Gracios, C., Munoz-Hernandez, G.A., Trentadue, L., Torrente-Lujan, E., Wang, S., Bertsche, D., Gramolin, A., Telnov, V., Kado, M., Petroff, P., Azzi, P., Nicrosini, O., Piccinini, F., Montagna, G., Kapusta, F., Laplace, S., daSilva, W., Gizani, N., Craig, N., Han, T., Luci, C., Mele, B., Silvestrini, L., Ciuchini, M., Cakir, R., Aleksan, R., Couderc, F., Ganjour, S., Lançon, E., Locci, E., Schwemling, P., Spiro, M., Tanguy, C., Zinn-Justin, J., Moretti, S., Kikuchi, M., Koiso, H., Ohmi, K., Oide, K., Pauletta, G., RuizdeAustri, R., Gouzevitch, M. & Chattopadhyay S. (2014). First Look at the Physics Case of TLEP. Journal of High Energy Physics 2014(01): 164.
• Lenz, Alexander, Hodges, David, Hulme, Daniel, Kvedaraite, Sandra, Richings, Jack, Shen Woo, Jian & Waite, Philip (2014). Investigating bounds on decoherence in quantum mechanics via B and D-mixing. Nuclear Physics B 888: 129-136.
• Lenz, Alexander (2014). Selected Topics in Heavy Flavour Physics. Journal of Physics G: Nuclear and Particle Physics 41(10): 103001.
• The LHCb Collaboration,, Bharucha, A., Bigi, I.I., Bobeth, C., Bobrowski, M., Brod, J., Buras, A.J., Davies, C.T.H., Datta, A., Delaunay, C., Descotes-Genon, S., Ellis, J., Feldmann, T., Fleischer, R., Gedalia, O., Girrbach, J., Guadagnoli, D., Hiller, G., Hochberg, Y., Hurth, T., Isidori, G., Jäger, S., Jung, M., Kagan, A., Kamenik, J.F., Lenz, A., Ligeti, Z., London, D., Mahmoudi, F., Matias, J., Nandi, S., Nir, Y., Paradisi, P., Perez, G., Petrov, A.A., Rattazzi, R., Sharpe, S.R., Silvestrini, L., Soni, A., Straub, D.M., van Dyk, D., Virto, J., Wang, Y.-M., Weiler, A. & Zupan, J. (2013). Implications of LHCb measurements and future prospects. The European Physical Journal C 73: 2373.
• Lenz, Alexander (2013). Constraints on a fourth generation of fermions from Higgs Boson searches. Advances in High Energy Physics 2013: 910275.
• Lenz, Alexander & Rauh, Thomas (2013). D-meson lifetimes within the heavy quark expansion. Physical Review D: particles, fields, gravitation and cosmology 88(3): 034004.
• Krinner, Fabian, Lenz, Alexander & Rauh, Thomas (2013). The inclusive decay b→ccs¯ revisited. Nuclear Physics B 876(1): 31–54.
• Eberhardt, Otto, Herbert, Geoffrey, Lacker, Heiko, Lenz, Alexander, Menzel, Andreas, Nierste, Ulrich & Wiebusch, Martin (2012). Joint analysis of Higgs boson decays and electroweak precision observables in the standard model with a sequential fourth generation. Physical Review D 86(1): 013011.
• Lenz, A., Nierste, U. Charles, J. Descotes-Genon, S. Lacker, H. Monteil, S., Niess, V. & Jampens, S.T. (2012). Constraints on new physics in $B-\bar{B}$ mixing in the light of recent LHCb data. Physical Review D 86(3): 033008.
• Eberhardt, Otto, Lenz, Alexander, Menzel, Andreas, Nierste, Ulrich & Wiebusch, Martin (2012). Status of the fourth fermion generation before ICHEP2012: Higgs data and electroweak precision observables. Physical Review D 86(7): 074014.
• Djouadi, Abdelhak & Lenz, Alexander (2012). Sealing the fate of a fourth generation of fermions. Physics Letters B 715(4-5): 310-314.
• Eberhardt, Otto Herbert, Geoffrey, Lacker, Heiko, Lenz, Alexander Menzel, Andreas Nierste, Ulrich & Wiebusch, Martin (2012). Impact of a Higgs boson at a mass of 126 GeV on the standard model with three and four fermion generations. Physical Review Letters 109(24): 241802.
• Kaburaki, Y., Konya, K., Kubo, J. & Lenz, A. (2011). Triangle relation of dark matter, EDM and CP violation in B0 mixing in a Sspersymmetric Q6 model. Physical Review D 84(1): 016007.
• Lenz, A.J. (2011). Simple relation for Bs mixing. Physical Review D 84(3): 031501(R).
• Lenz, A., Pas, H. & Schalla, D. (2011). Fourth generation Majorana neutrinos. Physical Review D 85(7): 075025.
• Lenz, A., Nierste, U., Charles, J., Descotes-Genon, S., Jantsch, A., Kaufhold, C., Lacker, H., Monteil, S., Niess, V. & T'Jampens, S. (2011). Anatomy of new physics in B-B¯¯¯ mixing. Physical Review D 83(3): 036004.
• Bobrowski, M., Lenz, A., Riedl, J. & Rohrwild, J. (2010). How large can the SM contribution to CP violation in D0 − D0 mixing be? Journal of high energy physics 2010(03): 009.
• O'Leary, B. & others (2010). SuperB Progress Reports - Physics. arXiv
• Kubo, J. & Lenz, A. (2010). Large loop effects of extra SUSY Higgs doublets to CP violation in B^0 mixing. Physical Review D 82(7).
• Eberhardt, O., Lenz, A. & Rohrwild, J. (2010). Less space for a new family of fermions. Physical Review D 82(9): 095006.
• Kawashima, Kenji Kubo, Jisuke & Lenz, Alexander (2009). Testing the new CP phase in a Supersymmetric Model with Q(6) Family Symmetry by B(s) Mixing. Physics Letters B 681(1): 60-67.
• Braun, V.M., Ivanov, D. Yu., Lenz, A. & Peters, A. (2009). Exclusive production of soft pions in DIS. Modern Physics Letters A 24(35n37): 2931-2939.
• Braun, V.M., Göckeler, M., Horsley, R., Kaltenbrunner, T., Lenz, A., Nakamura, Y., Pleiter, D., Rakow, P.E.L., Rohrwild, J., Schäfer, A., Schierholz, G., Stüben, H., Warkentin, N. & Zanotti, J.M. (2009). Electroproduction of the N*(1535) resonance at large momentum transfer. Physical Review Letters 103(7): 072001.
• Bobrowski, M., Lenz, A., Riedl, J. & Rohrwild, J. (2009). How much space is left for a new family of fermions? Physical Review D 79(11): 113006
• Lenz, A., Göckeler, M., Kaltenbrunner, T. & Warkentin, N. (2009). Nucleon distribution amplitudes and their application to nucleon form factors and the N→Δ transition at intermediate values of Q2. Physical Review D 79(9): 093007.
• Bobrowski, M., Lenz, A., Riedl, J. & Rohrwild, J. (2009). D−D¯ mixing in the framework of the HQE revisited. arXiv
• Buchalla, G., Komatsubara, T.K., Muheim, F., Silvestrini, L., Artuso, M., Asner, D.M., Ball, P., Baracchini, E., Bell, G., Beneke, M., Berryhill, J., Bevan, A., Bigi, I.I., Blanke, M., Bobeth, Ch., Bona, M., Borzumati, F., Browder, T., Buanes, T., Buchmüller, O., Buras, A.J., Burdin, S., Cassel, D.G., Cavanaugh, R., Ciuchini, M., Colangelo, P., Crosetti, G., Dedes, A., De Fazio, F., Descotes-Genon, S., Dickens, J., Doležal, Z., Dürr, S., Egede, U., Eggel, C., Eigen, G., Fajfer, S., Feldmann, Th., Ferrandes, R., Gambino, P., Gershon, T., Gibson, V., Giorgi, M., Gligorov, V.V., Golob, B., Golutvin, A., Grossman, Y., Guadagnoli, D., Haisch, U., Hazumi, M., Heinemeyer, S., Hiller, G., Hitlin, D., Huber, T., Hurth, T., Iijima, T., Ishikawa, A., Isidori, G., Jäger, S., Khodjamirian, A., Koppenburg, P., Lagouri, T., Langenegger, U., Lazzeroni, C., Lenz, A., Lubicz, V., Lucha, W., Mahlke, H., Melikhov, D., Mescia, F., Misiak, M., Nakao, M., Napolitano, J., Nikitin, N., Nierste, U., Oide, K., Okada, Y., Paradisi, P., Parodi, F., Patel, M., Petrov, A.A., Pham, T.N., Pierini, M., Playfer, S., Polesello, G., Policicchio, A., Poschenrieder, A., Raimondi, P., Recksiegel, S., Řezníček, P., Robert, A., Rosner, J.L., Ruggiero, G., Sarti, A., Schneider, O., Schwab, F., Simula, S., Sivoklokov, S., Slavich, P., Smith, C., Smizanska, M., Soni, A., Speer, T., Spradlin, P., Spranger, M., Starodumov, A., Stech, B., Stocchi, A., Stone, S., Tarantino, C., Teubert, F., T’Jampens, S., Toms, K., Trabelsi, K., Trine, S., Uhlig, S., Vagnoni, V., van Hunen, J.J., Weiglein, G., Weiler, A., Wilkinson, G., Xie, Y., Yamauchi, M., Zhu, G., Zupan, J. & Zwicky, R. (2008). $B$, $D$ and $K$ decays. The European Physical Journal C 57(1-2): 309-492.
• Kifune, N., Kubo, J. & Lenz, A. (2008). Flavor changing neutral Higgs bosons in a supersymmetric extension based on a Q6 family symmetry. Physical Review D 77(7): 076010.
• Bona, M et al. & Lenz, A. (2007). SuperB: A High-Luminosity Asymmetric e+ e- Super Flavor Factory. Conceptual Design Report.
• Lenz, Alexander & Nierste, Ulrich (2007). Theoretical update of Bs mixing. Journal of High Energy Physics 2007(06): 072.
• Braun, Vladimir, Ivanov, Dmitri, Lenz, Alexander & Peters, Andreas (2007). Deep inelastic pion electroproduction at threshold. Physical Review D 75(1).
• Lenz, Alexander (2007). Unparticle Effects in Bs mixing. Physical Review D 76(6): 065006.
• Ball, Patricia, Braun, Vladimir & Lenz, Alexander (2007). Twist-4 distribution amplitudes of the K* and phi mesons in QCD. Journal of High Energy Physics 2007(08): 090.
• Braun, Vladimir, Lenz, Alexander, Peters, Gerhard & Radyushkin, A (2006). Light cone sum rules for gamma* N ---> Delta transition form-factors. Physical Review D 73(3).
• Braun, Vladimir, Lenz, Alexander & Wittmann, Markus (2006). Nucleon Form Factors in QCD. Physical Review D 73(9).
• Ball, Patricia, Braun, Vladimir & Lenz, Alexander (2006). Higher-twist distribution amplitudes of the K meson in QCD. Journal of High Energy Physics 2006(05): 004.
• Braun,Vladimir & Lenz, Alexander (2004). On the SU(3) symmetry-breaking corrections to meson distribution amplitudes. Physical Review D 70(7).
• Battaglie, et al & Lenz, Alexander (2004). The CKM matrix and the unitarity triangle. arXiv
• Lenz, Alexander, Wittmann, Markus & Stein, Eckart (2004). Improved light-cone sum rules for the electromagnetic form factors of the nucleon. Physics Letters B 581(3-4): 199-206.
• Beneke, Martin, Buchalla, Gerhard,, Lenz, Alexander & Nierste, Ulrich (2003). CP asymmetry in flavor specific B decays beyond leading logarithms. Physics Letters B 576(1-2): 173.
• Beneke, Martin, Buchalla, Gerhard, Greub, Christoph, Lenz, Alexander & Nierste, Ulrich (2002). The B+−Bd0 lifetime difference beyond leading logarithms. Nuclear Physics B 639(1-2): 389-407.
• Braun, Vladimir, Lenz, Alexander, Mahnke, Nils & Stein, Eckart (2002). Light cone sum rules for the nucleon form-factors. Physical Review D 65(7).
• Beneke, Martin & Lenz, Alexander (2001). Lifetime difference of B(s) mesons: Theory status. Journal of Physics G: Nuclear and Particle Physics 27(6): 1219.
• Beneke, Martin, Buchalla, Gerhard, Greub, Christoph, Lenz, Alexander & Nierste, Ulrich (1999). Next-to-leading order QCD corrections to the lifetime difference of B(s) mesons. Physics Letters B 459(4): 631.
• Lenz, Alexander, Ostermaier, Gaby & Nierste, Ulrich (1999). Determination of the CKM angle gamma and |V(ub) / V(cb)| from inclusive direct CP asymmetries and branching ratios in charmless B decays. Physical Review D 59(3).
• Lenz, Alexander, Ostermaier, Gaby & Nierste, Ulrich (1997). Penguin diagrams, charmless B decays and the missing charm puzzle. Physical Review D 56(11): 7228.