Publications (122)
SU(3) Decomposition of Two-Body B Decay Amplitudes
Benjamin Grinstein, Richard F. Lebed
We present the complete flavor SU(3) decomposition of decay amplitudes for decays of the triplet (B^+_u, B^0_d, B^0_s) of B mesons nonleptonically into two pseudoscalar mesons. Thi…
Explicit Quark-Hadron Duality Violations in B-Meson Decays
Benjamin Grinstein, Michael Savrov
Duality is not violated at order Delta/M once j=3/2 and j=1/2+ states are properly accounted for.
Indirect bounds on new physics for
Benjamin Grinstein, Jason Aebischer
The Standard Model prediction of the lifetime is discussed, together with the dominant uncertainties and strategies on how to improve them. Furthermore, a new method to compu…
What if? On the interplay between Serendipity, Intuition and Conjecture
Benjamin Grinstein
While the Standard Model is in good shape, there are many reasons to believe it is incomplete. There are high expectations that the LHC will shed light on some well studied possibi…
Zeno-Gravity Correspondence: Zeno's Dichotomy Paradox and Gravitational red-shift near Event Horizon
Sridip Pal, Benjamin Grinstein
We relate Zeno's Dichotomy paradox with gravitational red-shift near event horizon in a spherically symmetric space-time. A dictionary of this connection, henceforth called as Zeno…
An expansion for Neutrino Phenomenology
Benjamin Grinstein, Michael Trott
We develop a formalism for constructing the Pontecorvo-Maki-Nakagawa-Sakata (PMNS) matrix and neutrino masses using an expansion that originates when a sequence of heavy right hand…
Model-Independent Extraction of |V_{cb}| Using Dispersion Relations
C. Glenn Boyd, Benjamin Grinstein, Richard F. Lebed
We present a method for parametrizing heavy meson semileptonic form factors using dispersion relations, and from it produce a two-parameter description of the B -> B elastic form f…
Flavor Changing Supersymmetry Interactions in a Supernova
Philip S. Amanik, George M. Fuller, Benjamin Grinstein
We consider for the first time R-parity violating interactions of the Minimal Standard Supersymmetric Model involving neutrinos and quarks (``flavor changing neutral currents'', FC…
Form Factors in the Heavy Quark and Chiral Limit: Pole dominance in
Benjamin Grinstein, Paul F. Mende
It is shown that the form factors in the semileptonic decay of ground state heavy mesons to light pseudoscalar mesons are dominated by the vector meson pole at all momentum transfe…
On a precise calculation of (f_{B_s}/f_B) / (f_{D_s}/f_D) and its implications on the interpretation of B - \bar B mixing
Benjamin Grinstein
We observe that quantities like (f_{B_s}/f_B) / (f_{D_s} /f_D) are predicted to be unity both by heavy quark and by light quark flavor symmetries. Hence, the deviation from the sym…
Causality as an emergent macroscopic phenomenon: The Lee-Wick O(N) model
Benjamin Grinstein, Donal O'Connell, Mark B. Wise
In quantum mechanics the deterministic property of classical physics is an emergent phenomenon appropriate only on macroscopic scales. Lee and Wick introduced Lorentz invariant qua…
Dark Matter Capture by Atomic Nuclei
Bartosz Fornal, Benjamin Grinstein, Yue Zhao
We propose a new strategy to search for a particular type of dark matter via nuclear capture. If the dark matter particle carries baryon number, as motivated by a class of theoreti…
Electroweak Baryogenesis with a Pseudo-Goldstone Higgs
Benjamin Grinstein, Michael Trott
We examine the nature of electroweak Baryogenesis when the Higgs boson's properties are modified by the effects of new physics. We utilize the effective potential to one loop (ring…
Systematic Study of Theories with Quantum Modified Moduli II
Benjamin Grinstein, Detlef R. Nolte
We complete the process of classifying all supersymmetric theories with quantum modified moduli. We present all the supersymmetric gauge theories based on a simple orthogonal or ex…
Heavy Mesons in Two Dimensions
Benjamin Grinstein, Paul F. Mende
The large mass limit of QCD uncovers symmetries that are not present in the QCD lagrangian. These symmetries have been applied to physical (finite mass) systems, such as B and D me…
DirectDM: a tool for dark matter direct detection
Fady Bishara, Joachim Brod, Benjamin Grinstein +1
We provide a Mathematica package, DirectDM, that takes as input the Wilson coefficients of the relativistic effective theory describing the interactions of dark matter with quarks,…
Light-Quark, Heavy-Quark Systems: An Update
Benjamin Grinstein
We review many of the recently developed applications of Heavy Quark Effective Theory techniques. After a brief update on Luke's theorem, we describe striking relations between hea…
A Modern Introduction to Quarkonium Theory
Benjamin Grinstein
Recent advances in lattice and continuum QCD have given us new insights into quarkonium physics. These set of lectures are intend for the uninitiated. We first give a physical pict…
Conference Summary
Benjamin Grinstein
Conference Summary at FPCP04
SU(3) Corrections to B -> D l nu Form Factors at O(1/M)
C. Glenn Boyd, Benjamin Grinstein
We compute the O(1/M,m_s) heavy quark and SU(3) corrections to B_s -> D_s e nu form factors. In the limit of vanishing light quark mass, B_s -> D_s e nu form factors are given in t…
CKM Sides: Theory
Benjamin Grinstein
We review the theory of the determination of the CKM elements Vcb and Vub. Particular attention is paid to the determination of Vcb through inclusive semileptonic B decays to charm…
Minimal Flavor Violation in the Lepton Sector
Vincenzo Cirigliano, Benjamin Grinstein, Gino Isidori +1
We extend the notion of Minimal Flavor Violation to the lepton sector. We introduce a symmetry principle which allows us to express lepton flavor violation in the charged lepton se…
FPCP Theory Overview
Benjamin Grinstein
We first review some aspects of the determination of the sides and angles of the unitarity triangle. We pay particular attention to theory shortcomings, and present many alternativ…
$\bar B\to\bar K\e^+\e^-$ in Chiral Perturbation Theory
Adam F. Falk, Benjamin Grinstein
The combined use of chiral and heavy quark symmetries allows one to relate the hadronic form factors for the decay $\bar B\to \bar K\e^+\e^-$ to those for $\bar B\toÏ\e^-\…
Exact Heavy to Light Meson Form Factors in the Combined Heavy Quark, Large and Chiral Limits
Benjamin Grinstein, Paul F. Mende
We demonstrate that the form factors of local operators between a heavy meson state (like the~) and a light pseudoscalar state (like the pion) are given exactly by a single pole…
Perturbative corrections to zero recoil inclusive decay sum rules
Anton Kapustin, Zoltan Ligeti, Mark B. Wise +1
Comparing the result of inserting a complete set of physical states in a time ordered product of decay currents with the operator product expansion gives a class of zero recoil…
Theory of the endpoint region of exclusive rare B decays
Benjamin Grinstein
In the ratio of ratios of rates for radiative and semileptonic decays of B and D to K* and rho mesons the non-computable form factors mostly cancel out. The resulting method for th…
Determining V(ub) from B+ --> D*+(s) e+ e- and B+ --> D*+ e+ e-
David H. Evans, Benjamin Grinstein, Detlef R. Nolte
It was recently pointed out that the decays B^+ --> D^{*+}_s gamma and B^+ --> D^{*+} gamma can be used for an extraction of |V_{ub}|. The theory of these decays is poorly understo…
Dark Matter Interpretation of the Neutron Decay Anomaly
Bartosz Fornal, Benjamin Grinstein
There is a long-standing discrepancy between the neutron lifetime measured in beam and bottle experiments. We propose to explain this anomaly by a dark decay channel for the neutro…
Grand Unification and the Principle of Minimal Flavor Violation
Benjamin Grinstein, Vincenzo Cirigliano, Gino Isidori +1
Minimal Flavor Violation is an attractive approach to suppress unacceptably large flavor changing neutral currents from beyond the standard model physics at the TeV scale. It can b…
Baryon Number and Lepton Universality Violation in Leptoquark and Diquark Models
Nima Assad, Bartosz Fornal, Benjamin Grinstein
We perform a systematic study of models involving leptoquarks and diquarks with masses well below the grand unification scale and demonstrate that a large class of them is excluded…
Two-loop renormalization of multiflavor theory in six dimensions and the trace anomaly
Benjamin Grinstein, Andreas Stergiou, David Stone +1
We use the background-field method and the heat kernel to obtain all counterterms to two-loop order of conformally-coupled multiflavor theory in six spacetime dimensions, de…
Top quark induced vacuum misalignment in little higgs models
Benjamin Grinstein, Michael Trott
We show that the effect of the top quark can dominate over the effect of the gauge sector in determining the vacuum alignment in little higgs (LH) models. We demonstrate that in th…
ALP contribution to the Strong CP problem
Victor Enguita, Belen Gavela, Benjamin Grinstein +1
We compute the one-loop contribution to the -parameter of an axion-like particle (ALP) with CP-odd derivative couplings. Its contribution to the neutron electric dipole mom…
On Constraints for Heavy-Meson Form Factors
Benjamin Grinstein, Paul F. Mende
We examine the recent work of de Rafael and Taron where model-independent bounds on the Isgur-Wise function are presented. We first argue that the bounds cannot hold in as much gen…
The SSC: Programme and Searches for New Particles
Benjamin Grinstein
Talk presented at the Trieste Workshop on the Search for New Elementary Particles: Status and Prospects.
Semileptonic B and Lambda_b Decays and Local Duality in QCD
C. Glenn Boyd, Benjamin Grinstein, Aneesh V. Manohar
The inclusive and exclusive semileptonic decay distributions for b -> c decay are computed in the Shifman-Voloshin limit. The inclusive decay distributions (computed using an opera…
SU(5) Unification without Proton Decay
Bartosz Fornal, Benjamin Grinstein
We construct a four-dimensional SU(5) grand unified theory in which the proton is stable. The Standard Model leptons reside in the 5 and 10 irreps of SU(5), whereas the quarks live…
Flavor Symmetric Sectors and Collider Physics
Benjamin Grinstein, Alexander L. Kagan, Michael Trott +1
We discuss the phenomenology of effective field theories with new scalar or vector representations of the Standard Model quark flavor symmetry group, allowing for large flavor brea…
Heavy Flavor Theory
Benjamin Grinstein
This is a limited review and update of the status of Heavy Flavor Physics. After we review the flavor problem we discuss a number of topics: recent puzzles in purely leptonic D and…
Dark Side of the Neutron?
Bartosz Fornal, Benjamin Grinstein
We discuss our recently proposed interpretation of the discrepancy between the bottle and beam neutron lifetime experiments as a sign of a dark sector. The difference between the o…
Effective Field Theory and Matching in Non-Relativistic Gauge Theories
Benjamin Grinstein, Ira Z. Rothstein
The effective Lagrangian and power counting rules for non-relativistic gauge theories are derived via an expansion in . It is shown that the expansion leads to an effect…
Constraints on Extended Technicolor Models from B -> mu+ mu- X
Benjamin Grinstein, Yosef Nir, Joao M. Soares
A recent study by Randall and Sundrum shows that models of Extended Technicolor (ETC) have interesting implications on rare B decays. We extend their study to the decay B -> mu+ mu…
Exclusive rare B -> K*e+e- decays at low recoil: controlling the long-distance effects
Benjamin Grinstein, Dan Pirjol
We present a model-independent description of the exclusive rare decays B-> K* e+e- in the low recoil region (large lepton invariant mass q^2 ~ m_b^2). In this region the long-dist…
gauge invariance and the shape of new physics in rare decays
Rodrigo Alonso, Benjamin Grinstein, Jorge Martin Camalich
New physics effects in decays are routinely modeled through operators invariant under the strong and electromagnetic gauge symmetries. Assuming the scale for new physics is wel…
Explicit Quark-hadron Duality in Heavy-light Meson Weak Decays in the 't Hooft Model
Benjamin Grinstein, Richard F. Lebed
We compute the nonleptonic weak decay width of a heavy-light meson in 1+1 spacetime dimensions with a large number of QCD colors (the 't Hooft model) as a function of the heavy qua…
A Method For Extracting cosα
Benjamin Grinstein, Detlef R. Nolte, Ira Z. Rothstein
We show that it is possible to extract the weak mixing angle alpha via a measurement of the rate for B^+(-) -> Ï^+(-) e^+e^-. The sensitivity to cos(alpha) results from the interf…
Subleading corrections to the V_ub determination from exclusive B decays
Benjamin Grinstein, Dan Pirjol
It has been proposed to determine the CKM matrix element |V_ub| in a model-independent way from a combination of rare and semileptonic B and D decays near the zero recoil point. An…
An Introduction to Heavy Mesons
Benjamin Grinstein
Introductory lectures (delivered at the VI Mexican School of Particles and Fields) on heavy quarks and heavy quark effective field theory. Applications to inclusive semileptonic de…
Short Distance Analysis of and
David H. Evans, Benjamin Grinstein, Detlef R. Nolte
Over a large fraction of phase space a combination of an operator product and heavy quark expansions effectively turn the decay into a ``short distance''…
Neutrino Masses in the Lee-Wick Standard Model
Jose Ramon Espinosa, Benjamin Grinstein, Donal O'Connell +1
Recently, an extension of the standard model based on ideas of Lee and Wick has been discussed. This theory is free of quadratic divergences and hence has a Higgs mass that is stab…
Adding Matter to Poincare Invariant Branes
Benjamin Grinstein, Detlef R. Nolte, Witold Skiba
A solution to the cosmological constant problem has been proposed in which our universe is a 3-brane in a 5-dimensional spacetime. With a bulk scalar, the field equations admit a P…
Light scalar at LHC: the Higgs or the dilaton?
Walter D. Goldberger, Benjamin Grinstein, Witold Skiba
It is likely that the LHC will observe a color- and charge-neutral scalar whose decays are consistent with those of the Standard Model (SM) Higgs boson. The Higgs interpretation of…
Shape and soft functions of HQET and SCET in the 't Hooft Model
Benjamin Grinstein
The main application of Heavy Quark Effective Theory (HQET) and of Soft Collinear Effective Theory (SCET) is in establishing factorization theorems for exclusive and semi-inclusive…
Muon Collider Higgs Factory for Snowmass 2013
Yuri Alexahin, Charles M. Ankenbrandt, David B. Cline +27
We propose the construction of, and describe in detail, a compact Muon Collider s-channel Higgs Factory.
Lifetime of the meson in relation to flavour anomalies
Benjamin Grinstein, Jason Aebischer
The Standard Model decay rate of the meson is discussed together with a novel approach that uses experimental data in combination with an operator product expansion. In the n…
Model-independent constraints on hadronic form factors with above-threshold poles
Irinel Caprini, Benjamin Grinstein, Richard F. Lebed
Model-independent constraints on hadronic form factors, in particular those describing exclusive semileptonic decays, can be derived from the knowledge of field correlators calcula…
Falsifying Models of New Physics Via WW Scattering
Jacques Distler, Benjamin Grinstein, Rafael A. Porto +1
We show that the coefficients of operators in the electroweak chiral Lagrangian can be bounded if the underlying theory obeys the usual assumptions of Lorentz invariance, analytici…
Factorization in B -> K pi e+e- decays
Benjamin Grinstein, Dan Pirjol
We derive factorization relations for the transverse helicity amplitudes in the rare decays B-> KÏl+l- at leading order in Lambda/m_b, in the kinematical region with an energetic…
Precision Corrections to Dispersive Bounds on Form Factors
C. Glenn Boyd, Benjamin Grinstein, Richard F. Lebed
We present precision corrections to dispersion relation bounds on form factors in bottom hadron semileptonic decays and analyze their effects on parameterizations derived from thes…
Strong Couplings of X(3872)_{J=1,2} and a New Look at J/psi Suppression in Heavy Ion Collisions
Federico Brazzi, Benjamin Grinstein, Fulvio Piccinini +2
We define and compute from data the strong couplings of the X(3872) with both of the possible quantum numbers assignments J^{PC}=1^{++},2^{-+}. We use these to compute cross sectio…
Hidden Fine Tuning In The Quark Sector Of Little Higgs Models
Benjamin Grinstein, Randall Kelley, Patipan Uttayarat
In Little Higgs models a collective symmetry prevents the higgs from acquiring a quadratically divergent mass at one loop. We have previously shown that the couplings in the Little…
A Higgs-Higgs bound state due to New Physics at a TeV
Benjamin Grinstein, Michael Trott
We examine the effects of new physics effecting the Higgs sector of the standard model, focusing on the effects on the Higgs self couplings. We demonstrate that a low mass higgs, m…
Limit Cycles and Conformal Invariance
Jean-François Fortin, Benjamin Grinstein, Andreas Stergiou
There is a widely held belief that conformal field theories (CFTs) require zero beta functions. Nevertheless, the work of Jack and Osborn implies that the beta functions are not ac…
A challenge to the -theorem in six dimensions
Benjamin Grinstein, Andreas Stergiou, David Stone +1
The possibility of a strong -theorem in six dimensions is examined in multi-flavor theory. Contrary to the case in two and four dimensions, we find that in perturbation t…
Systematic Study of Theories with Quantum Modified Moduli
Benjamin Grinstein, Detlef R. Nolte
We begin the process of classifying all supersymmetric theories with quantum modified moduli. We determine all theories based on a single SU or Sp gauge group with quantum modified…
Overview: Sides of the Unitarity Triangle
Benjamin Grinstein
This is an opening talk for the workshop and is intended to be provocative. We take a stab at the following questions: How well do we really know the sides of the unitarity triangl…
The photon polarization in B -> X gamma in the standard model
Benjamin Grinstein, Yuval Grossman, Zoltan Ligeti +1
The standard model prediction for the decay amplitude with a right-handed photon is believed to be tiny, suppressed by , compared to the amplitude wit…
Operator Product Expansion for Exclusive Decays: B^+ ->Ds^+ e+e- and B^+ -> Ds^{*+} e+e-
David H. Evans, Benjamin Grinstein, Detlef R. Nolte
The decays and proceed through a weak and an electromagnetic interaction. This is a typical ``long distance'' process, usually…
Massive Vector Scattering in Lee-Wick Gauge Theory
Benjamin Grinstein, Donal O'Connell, Mark B. Wise
We demonstrate that amplitudes describing scattering of longitudinally polarized massive vector bosons present in non-Abelian Lee-Wick gauge theory do not grow with energy and, hen…
From quarks to nucleons in dark matter direct detection
Fady Bishara, Joachim Brod, Benjamin Grinstein +1
We provide expressions for the nonperturbative matching of the effective field theory describing dark matter interactions with quarks and gluons to the effective theory of nonrelat…
Lee-Wick Theories at High Temperature
Bartosz Fornal, Benjamin Grinstein, Mark B. Wise
An extension of the standard model, the Lee-Wick standard model, based on ideas of Lee and Wick was recently introduced. It does not contain quadratic divergences in the Higgs mass…
Weak mixing below the weak scale in dark-matter direct detection
Joachim Brod, Benjamin Grinstein, Emmanuel Stamou +1
If dark matter couples predominantly to the axial-vector currents with heavy quarks, the leading contribution to dark-matter scattering on nuclei is either due to one-loop weak cor…
Renormalization Group Effects in Dark Matter Interactions
Fady Bishara, Joachim Brod, Benjamin Grinstein +1
We present a renormalization-group (RG) analysis of dark matter interactions with the standard model, where dark matter is allowed to be a component of an electroweak multiplet, an…
Above-Threshold Poles in Model-Independent Form Factor Parametrizations
Benjamin Grinstein, Richard F. Lebed
The model-independent parametrization for exclusive hadronic form factors commonly used for semileptonic decays is generalized to allow for the inclusion of above-threshold resonan…
Light Threshold Effects in Supersymmetric Grand Unified Theories
Alon E. Faraggi, Benjamin Grinstein
Supersymmetric Grand Unified Theories have a rich spectrum of particles barely heavier than the intermediate vector bosons. As their non-supersymmetric counterparts, they lead to m…
Left-Right SU(4) Vector Leptoquark Model for Flavor Anomalies
Bartosz Fornal, Sri Aditya Gadam, Benjamin Grinstein
Building on our recent proposal to explain the experimental hints of new physics in meson decays within the framework of Pati-Salam quark-lepton unification, through the intera…
The Case for a Muon Collider Higgs Factory
Yuri Alexahin, Charles M. Ankenbrandt, David B. Cline +30
We propose the construction of a compact Muon Collider Higgs Factory. Such a machine can produce up to \sim 14,000 at 8\times 10^{31} cm^-2 sec^-1 clean Higgs events per year, enab…
Neutron's Dark Secret
Bartosz Fornal, Benjamin Grinstein
The existing discrepancy between neutron lifetime measurements in bottle and beam experiments has been interpreted as a sign of the neutron decaying to dark particles. We summarize…
Strong Electroweak Symmetry Breaking
Benjamin Grinstein
Models of spontaneous breaking of electroweak symmetry by a strong interaction do not have fine tuning/hierarchy problem. They are conceptually elegant and use the only mechanism o…
Neutron Star Stability in Light of the Neutron Decay Anomaly
Benjamin Grinstein, Chris Kouvaris, Niklas Grønlund Nielsen
A recent proposal suggests that experimental discrepancies on the lifetime of neutrons can be resolved if neutrons decay to dark matter. At the same time it has been demonstrated t…
Grand Unified Theory with a Stable Proton
Bartosz Fornal, Benjamin Grinstein
We demonstrate that a phenomenologically viable four-dimensional grand unified theory with no proton decay can be constructed. This is done in the framework of the minimal non-supe…
Global duality in heavy flavor hadronic decays
Benjamin Grinstein
We show that heavy meson hadronic decay widths satisfy quark-hadron duality when smeared over the heavy quark mass, M, to an accuracy of order 1/M^2.
Errors in Lattice Extractions of alpha_s Due to Use of Unphysical Pion Masses
Benjamin Grinstein, I. Z. Rothstein
We investigate the errors due to the use of unphysical values of light quark masses in lattice extractions of . A functional form for the pion mass dependence of the quarkoni…
Phenomenology of Minimal Lepton Flavor Violation
Vincenzo Cirigliano, Benjamin Grinstein
We extend the effective theory of Minimal Lepton Flavor Violation (MLFV) by including four-lepton operators. We compute the rates for mu -> 3 e and tau -> 3 ell decays and point ou…
Model-Independent Determinations of B -> D l nu , D* l nu Form Factors
C. Glenn Boyd, Benjamin Grinstein, Richard F. Lebed
We present nonperturbative, model-independent parametrizations of the individual QCD form factors relevant to B -> D* l nu and B -> D l nu decays. These results follow from dispers…
An Introduction To The Theory Of Heavy Mesons And Baryons
Benjamin Grinstein
Introductory lectures (delivered at TASI, June 1994) on heavy quarks and heavy quark effective field theory. Applications to inclusive semileptonic decays and to interactions with…
Consequences of Weyl Consistency Conditions
Benjamin Grinstein, Andreas Stergiou, David Stone
The running of quantum field theories can be studied in detail with the use of a local renormalization group equation. The usual beta-function effects are easy to include, but by i…
The CP asymmetry in B^0(t) -> K_S Ï^0 γin the Standard Model
Benjamin Grinstein, Dan Pirjol
The time-dependent CP asymmetry in exclusive B^0(t) -> K^{*0}γdecays has been proposed as a probe of new physics in B decays. Recently, this method was extended to radiative decay…
The Lee-Wick Standard Model
Benjamin Grinstein, Donal O'Connell, Mark B. Wise
We construct a modification of the standard model which stabilizes the Higgs mass against quadratically divergent radiative corrections, using ideas originally discussed by Lee and…
New Physics Searches at Kaon and Hyperon Factories
Evgueni Goudzovski, Diego Redigolo, Kohsaku Tobioka +61
Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths…
Constraints on Form Factors For Exclusive Semileptonic Heavy to Light Meson Decays
C. Glenn Boyd, Benjamin Grinstein, Richard F. Lebed
We use rigorous QCD dispersion relations to derive model-independent bounds on the B -> pi l nu, D -> pi l nu and D -> K l nu form factors. These bounds are particularly restrictiv…
Comment On ``Grand Unification and Supersymmetric Threshold"
Alon E. Faraggi, Benjamin Grinstein, Sydney Meshkov
Barbieri and Hall have argued that threshold effects at the scale of grand-unification wipe out predictions on the SUSY scale, M_S. Using triviality arguments we give upper bounds…
Minimal Flavor Violation
Benjamin Grinstein
If new physics is called upon to explain away fine tunings, like the hierarchy problem, then, we argue, the principle of Minimal Flavor Violation is inescapable. We review the prin…
Global duality in heavy flavor decays in the 't Hooft model
Benjamin Grinstein
We average the decay width of a heavy meson in the t' Hooft model over the heavy quark mass M with a smooth weight function. The averaging has support over a few resonance spacings…
Comment on "Neutron lifetime and dark decay of the neutron and hydrogen''
Bartosz Fornal, Benjamin Grinstein
The manuscript by Berezhiani (arXiv:1812.11089) proposes a model that has the neutron decaying into a mirror neutron with a branching fraction of 1%, alleviating the tension betwee…
On a Covariant Determination of Mass Scales in Warped Backgrounds
Benjamin Grinstein, Detlef R. Nolte, Witold Skiba
We propose a method of determining masses in brane scenarios which is independent of coordinate transformations. We apply our method to the scenario of Randall and Sundrum (RS) wit…
Neutron Lifetime Discrepancy as a Sign of a Dark Sector?
Bartosz Fornal, Benjamin Grinstein
We summarize our recent proposal of explaining the discrepancy between the bottle and beam measurements of the neutron lifetime through the existence of a dark sector, which the ne…
Tetraquarks in the Born-Oppenheimer approximation
Davide Germani, Benjamin Grinstein, Antonio Davide Polosa
The conventional loosely bound molecule interpretation of the is not compatible with the recent LHCb experimental measurement of the ratio of branching fractions $\mathca…
Comments on Unparticles
Benjamin Grinstein, Kenneth Intriligator, Ira Z. Rothstein
We comment on several points concerning unparticles which have been overlooked in the literature. One regards Mack's unitarity constraint lower bounds on CFT operator dimensions,e.…