Effective Field Theory Amplitudes the On-Shell Way: Scalar and Vector Couplings to Gluons

We use on-shell methods to calculate tree-level effective field theory (EFT) amplitudes, with no reference to the EFT operators. Lorentz symmetry, unitarity and Bose statistics determine the allowed kinematical structures. As a by-product, the number of independent EFT operators simply follows from the set of polynomials in the Mandelstam invariants, subject to kinematical constraints. We demonstrate this approach by calculating several amplitudes with a massive, SM-singlet, scalar ($h$) or vector ($Z^\prime$) particle coupled to gluons. Specifically, we calculate $hggg$, $hhgg$ and $Z^\prime ggg$ amplitudes, which are relevant for the LHC production and three-gluon decays of the massive particle. We then use the results to derive the massless-$Z^\prime$ amplitudes, and show how the massive amplitudes decompose into the massless-vector plus scalar amplitudes. Amplitudes with the gluons replaced by photons are straightforwardly obtained from the above.Comment: 25 pages, 3 figures v2: references added, typos fixed and equation added in appendix, to appear in JHE

2016-2017 Beethoven Recital with pianist Yael Weiss

January 14, 2017 - Beethoven Recital with Yael Weiss January 15, 2017 at 10:00 AM - Beethoven Master Class with Yael Weiss January 15, 2017 at 1:00 PM - Beethoven Lecture with Yael Weis

2017-2018 Beethoven Lecture with Yael Weiss

January 14, 2017 - Beethoven Recital with Yael Weiss January 15, 2017 at 10:00 AM - Beethoven Master Class with Yael Weiss January 15, 2017 at 1:00 PM - Beethoven Lecture with Yael Weisshttps://spiral.lynn.edu/conservatory_masterclasses/1230/thumbnail.jp

Tagging new physics with charm

We propose a new variable, the charm fraction, for collider searches for new physics. We analyze this variable in the context of searches for simplified supersymmetry models with squarks, the gluino, and the bino, assuming that only the lightest mass-degenerate squarks can be produced at the high-luminosity LHC. The charm fraction complements event counting and kinematic information, increasing the sensitivity of the searches for models with heavy gluinos, for which squark production is flavor-blind. If squarks are discovered at the LHC, this variable can help discriminate between different underlying models. In particular, with improved charm tagging, the charm fraction can provide information on the gluino mass, and in some scenarios, on whether this mass is within the reach of a future 100 TeV hadron collider.Comment: 16 pages, 9 figures; double-tagging analysis added; discussion of results expanded; version to appear in JHE

2009-2010 Mark Kaplan and Yael Weiss in Recital: All Brahms Concert

Mark Kaplan Master Class (November 30, 2009) - Program Yael Weiss Master Class (December 4, 2009) - Progra

Constructing massive on-shell contact terms

The purely on-shell approach to effective field theories requires the construction of independent contact terms. Employing the little-group-covariant massive-spinor formalism, we present the first systematic derivation of independent four-point contact terms involving massive scalars, spin-1/2 fermions, and vectors. Independent three-point amplitudes are also listed for massive particles up to spin-3. We make extensive use of the simple relations between massless and massive amplitudes in this formalism. Our general results are specialized to the (broken-phase) particle content of the electroweak sector of the standard model. The (anti)symmetrization among identical particles is then accounted for. This work opens the way for the on-shell computation of massive four-point amplitudes.Comment: 27 pages, 1 figure and 5 table

2009-2010 Master Class - Yael Weiss (Piano)

Mark Kaplan and Yael Weiss in Recital: All Brahms Concert (December 3, 2009) - Programhttps://spiral.lynn.edu/conservatory_masterclasses/1088/thumbnail.jp

2009-2010 Philharmonia Season Program

Philharmonia No. 1 October 24, 2009 at 7:30 PM and October 25, 2009 at 4:00 PM Albert-George Schram, music director and conductor Five Pieces for Orchestra, op. 16 (1949 version) / Arnold Schoenberg -- Symphony No. 5 in D Major, K. 504 ( Prague ) / Wolfgang Amadeus Mozart -- Symphony No. 5 in B-flat Major, op. 100 / Sergei Prokofiev Philharmonia No. 2 November 14, 2009 at 7:30 PM and November 15, 2009 at 4:00 PM Jon Robertson, guest conductor ; Yang Shen, piano Overture to Euryanthe, J. 291 / Carl Maria von Weber -- Piano Concerto No. 4 in G Major, op. 58 / Ludwig van Beethoven -- Symphony No. 1 in C Minor, op. 68 / Johannes Brahms Philharmonia No. 3 December 5, 2009 at 7:30 PM and December 6, 2009 at 4:00 PM Jon Robertson, guest conductor ; Mark Kaplan, violin ; Yael Weiss, piano Don Juan, TrV 165 / Richard Strauss -- Concerto in D Minor for Violin, Piano and Strings / Felix Medelssohn -- Symphony No. 7 in A Major, op. 92 / Ludwig van Beethoven Philharmonia No. 4 January 30, 2010 at 7:30 PM and January 31 at 4:00 PM 2009 Concerto Competition Winners Concert Philharmonia No. 5 February 20, 2010 at 7:30 PM and February 21 at 4:00 PM Albert-George Schram, music director and conductor ; Joseph Robinson, oboe Symphonette No. 2 / Morton Gould -- Concerto in D Major for Oboe and Small Orchestra, TrV 292 / Richard Strauss -- Symphony No. 9 in E-flat Major, op. 70 / Dmitri Shostakovich Philharmonia No. 6 April 10, 2010 at 7:30 PM and April 11 at 4:00 PM Albert-George Schram, music director and conductor Frühlingsstimmen (Voices of Spring), op. 410 / Johannes Strauss, Jr. -- The Wand of Youth (Music to a Child\u27s Play), Suites 1 and 2 / Edward Elgar -- Symphony No. 1 in B-flat Major, op. 38 ( Spring ) / Robert Schumannhttps://spiral.lynn.edu/conservatory_philharmonia/1024/thumbnail.jp