Determining Spin through Quantum Azimuthal-Angle Correlations (2008)
Buckley, Matthew R., Choi, Seong Youl, Mawatari, Kentarou, Murayama, Hitoshi
Determining the spin of new particles is critical in identifying the true theory among various extensions of the Standard Model at the next generation of colliders. Quantum interference between...
Unified origin of baryons and dark matter (2008)
Kitano, Ryuichiro, Murayama, Hitoshi, Ratz, Michael
We investigate the possibility that both the baryon asymmetry of the universe and the observed cold dark matter density are generated by decays of a heavy scalar field which dominates the universe...
Looking up at seesaw and GUT scales from TeV (2008)
In this talk, I discuss how we may approach physics at the seesaw- and GUT-scales using data from the TeV scale. Even though we cannot hope to directly reach these energy scales using particle...
More visible effects of the hidden sector (2008)
There is a growing appreciation that hidden sector dynamics may affect the supersymmetry breaking parameters in the visible sector (supersymmetric standard model), especially when the dynamics is...
Baryon Triality And Neutrino Masses From An Anomalous Flavor U(1) (2008)
Dreiner, Herbi K., Luhn, Christoph, Murayama, Hitoshi, Thormeier, Marc
Quantum Interference Effects Among Helicities at LEP-II and Tevatron (2008)
Buckley, Matthew R., Heinemann, Beate, Klemm, William, Murayama, Hitoshi
A completely model-independent method of obtaining information on the spin using the quantum interference effect among various helicity states was proposed in a recent paper. Here we point out that...
Discriminating spin through quantum interference (2007)
Buckley, Matthew R., Murayama, Hitoshi, Klemm, William, Rentala, Vikram
Many of the proposed solutions to the hierarchy and naturalness problems postulate new `partner' fields to the standard model particles. Determining the spins of these new particles will be critical...
Supersymmetry breaking made easy, viable, and generic (2007)
The kind of supersymmetry that can be discovered at the LHC must be very much flavor-blind, which used to require very special intelligently designed models of supersymmetry breaking. This led to the...
More Visible Effects of the Hidden Sector (2007)
Murayama, Hitoshi, Nomura, Yasunori, Poland, David
There is a growing appreciation that hidden sector dynamics may affect the supersymmetry breaking parameters in the visible sector (supersymmetric standard model), especially when the dynamics is...
Dreiner, Herbi K., Luhn, Christoph, Murayama, Hitoshi, Thormeier, Marc
We devise minimalistic gauged U(1)_X Froggatt-Nielsen models which at low-energy give rise to the recently suggested discrete gauge Z_6 symmetry, proton hexality, thus stabilizing the proton....
Quark mass uncertainties revive Kim-Shifman-Vainshtein-Zakharov axion dark matter (2007)
Buckley, Matthew R., Murayama, Hitoshi
The Kaplan-Manohar ambiguity in light quark masses allows for a larger uncertainty in the ratio of up to down quark masses than naive estimates from the chiral Lagrangian would indicate. We show that...
Physics Beyond the Standard Model and Dark Matter (2007)
In this lecture note, I discuss why many of us are expecting rich physics at the TeV scale, drawing analogies from the history of physics in the last century. Then I review some of the possible...
Simple Scheme for Gauge Mediation (2007)
Murayama, Hitoshi, Nomura, Yasunori
We present a simple scheme for constructing models that achieve successful gauge mediation of supersymmetry breaking. In addition to our previous work [1] that proposed drastically simplified models...
Gauge Mediation Simplified (2006)
Murayama, Hitoshi, Nomura, Yasunori
Gauge mediation of supersymmetry breaking is drastically simplified using generic superpotentials without U(1)_R symmetry by allowing metastable vacua.
Baryon Triality and Neutrino Masses from an Anomalous Flavor U(1) (2006)
Dreiner, Herbi K., Luhn, Christoph, Murayama, Hitoshi, Thormeier, Marc
We construct a concise U(1)_X Froggatt-Nielsen model in which baryon triality, a discrete gauge Z_3 symmetry, arises from U(1)_X breaking. The proton is thus stable, however, R-parity is violated....
Probing Dark Energy via Neutrino & Supernova Observatories (2006)
Hall, Lawrence J., Murayama, Hitoshi, Papucci, Michele, Perez, Gilad
A novel method for extracting cosmological evolution parameters is proposed, using a probe other than light: future observations of the diffuse anti-neutrino flux emitted from core-collapse...
Electroweak Baryogenesis from Late Neutrino Masses (2005)
Hall, Lawrence J., Murayama, Hitoshi, Perez, Gilad
Electroweak Baryogenesis, given a first order phase transition, does not work in the standard model because the quark Yukawa matrices are too hierarchical. On the other hand, the neutrino mass matrix...
Natural soft leptogenesis (2005)
Grossman, Yuval, Kitano, Ryuichiro, Murayama, Hitoshi
Successful soft leptogenesis requires small B-terms for the right-handed sneutrinos and a large CP violating phase between the A- and B-terms. We show that this situation is realized naturally within...
Models of Neutrino Mass with a Low Cutoff Scale (2005)
Davoudiasl, Hooman, Kitano, Ryuichiro, Kribs, Graham D., Murayama, Hitoshi
In theories with a low quantum gravity scale, global symmetries are expected to be violated, inducing excessive proton decay or large Majorana neutrino masses. The simplest cure is to impose discrete...
APS Neutrino Study: Report of the Neutrino Astrophysics and Cosmology Working Group (2004)
Barwick, Steve W., Beacom, John F., Cianciolo, Vince, Dodelson, Scott, Feng, Jonathan L., Fuller, George M., ...
In 2002, Ray Davis and Masatoshi Koshiba were awarded the Nobel Prize in Physics ``for pioneering contributions to astrophysics, in particular for the detection of cosmic neutrinos.'' However, while...
A viable supersymmetric model with UV insensitive anomaly mediation (2004)
Ibe, Masahiro, Kitano, Ryuichiro, Murayama, Hitoshi
We propose an electroweak model which is compatible with the UV insensitive anomaly mediated supersymmetry breaking. The model is an extension of the NMSSM by adding vector-like matter fields which...
Right-Handed New Physics Remains Strangely Beautiful (2004)
Larson, Daniel T., Murayama, Hitoshi, Perez, Gilad
Current data on CP violation in B_d -> eta' K_S and B_d -> phi K_S, taken literally, suggest new physics contributions in b -> s transitions. Despite a claim to the contrary, we point out that...
The seesaw mechanism is attractive not only because it "explains'' small neutrino mass, but also because of its packaging with the SUSY-GUT, leptogenesis, Dark Matter, and electroweak symmetry...
Localized Supersoft Supersymmetry Breaking (2004)
Chacko, Z., Fox, Patrick J., Murayama, Hitoshi
We consider supersymmetry breaking models in which the MSSM is extended to include an additional chiral adjoint field for each gauge group with which the the MSSM gauginos acquire Dirac masses. We...
The New Minimal Standard Model (2004)
Davoudiasl, Hooman, Kitano, Ryuichiro, Li, Tianjun, Murayama, Hitoshi
We construct the New Minimal Standard Model that incorporates the new discoveries of physics beyond the Minimal Standard Model (MSM): Dark Energy, non-baryonic Dark Matter, neutrino masses, as well...
Auzzi, Roberto, Bolognesi, Stefano, Evslin, Jarah, Konishi, Kenichi, Murayama, Hitoshi
We study topological as well as dynamical properties of BPS nonabelian magnetic monopoles of Goddard-Nuyts-Olive-Weinberg type in $ G=SU(N)$, $USp(2N)$ and SO(N) gauge theories, spontaneously broken...
Probing the Planck Scale with Proton Decay (2004)
Harnik, Roni, Larson, Daniel T., Murayama, Hitoshi, Thormeier, Marc
We advocate the idea that proton decay may probe physics at the Planck scale instead of the GUT scale. This is possible because supersymmetric theories have dimension-5 operators that can induce...
Gauge Theories on an Interval: Unitarity Without a Higgs Boson (2004)
Csaki, Csaba, Grojean, Christophe, Murayama, Hitoshi, Luigi, Pilo, Terning, John
Viable Supersymmetry and Leptogenesis with Anomaly Mediation (2004)
Ibe, Masahiro, Kitano, Ryuichiro, Murayama, Hitoshi, Yanagida, Tsutomu
The seesaw mechanism that explains the small neutrino masses comes naturally with supersymmetric (SUSY) grand unification and leptogenesis. However, the framework suffers from the SUSY flavor and CP...
What can we learn from neutrinoless double beta decay experiments? (2004)
Bahcall, John N., Murayama, Hitoshi, Pena-Garay, Carlos
We assess how well next generation neutrinoless double beta decay and normal neutrino beta decay experiments can answer four fundamental questions. 1) If neutrinoless double beta decay searches do...
Gravitational Baryogenesis (2004)
Davoudiasl, Hooman, Kitano, Ryuichiro, Kribs, Graham D., Murayama, Hitoshi, Steinhardt, Paul J.
We show that a gravitational interaction between the derivative of the Ricci scalar curvature and the baryon-number current dynamically breaks CPT in an expanding universe and, combined with...
Electroweak Symmetry Breaking via UV Insensitive Anomaly Mediation (2004)
Kitano, Ryuichiro, Kribs, Graham D., Murayama, Hitoshi
Anomaly mediation solves the supersymmetric flavor and CP problems. This is because the superconformal anomaly dictates that supersymmetry breaking is transmitted through nearly flavor-blind infrared...
Outlook: The Next Twenty Years (2003)
I present an outlook for the next twenty years in particle physics. I start with the big questions in our field, broken down into four categories: horizontal, vertical, heaven, and hell. Then I...
Anomalous Flavor U(1)_X for Everything (2003)
Dreiner, Herbi K., Murayama, Hitoshi, Thormeier, Marc
We present an ambitious model of flavor, based on an anomalous U(1)_X gauge symmetry with one flavon, only two right-handed neutrinos and only two mass scales: M_{grav} and m_{3/2}. In particular,...
Impact of Neutrino Oscillation Measurements on Theory (2003)
Neutrino oscillation data had been a big surprise to theorists, and indeed they have ongoing impact on theory. I review what the impact has been, and what measurements will have critical impact on...
The Minimal Supersymmetric Fat Higgs Model (2003)
Harnik, Roni, Kribs, Graham D., Larson, Daniel T., Murayama, Hitoshi
We present a calculable supersymmetric theory of a composite ``fat'' Higgs boson. Electroweak symmetry is broken dynamically through a new gauge interaction that becomes strong at an intermediate...
Lepton-flavor mixing and $K \to \pi \nu\bar\nu$ decays (2003)
Grossman, Yuval, Isidori, Gino, Murayama, Hitoshi
The impact of possible sources of lepton-flavor mixing on $K \to \pi \nu\bar\nu$ decays is analysed. At the one-loop level lepton-flavor mixing originated from non-diagonal lepton mass matrices...
Supersymmetric Color Superconductivity (2003)
Harnik, Roni, Larson, Daniel T., Murayama, Hitoshi
Recent interest in novel phases in high density QCD motivates the study of high density supersymmetric QCD (SQCD), where powerful exact results for supersymmetric gauge theories can be brought to...
Neutrinoless Double Beta Decay in Light of SNO Salt Data (2003)
Murayama, Hitoshi, Pena-Garay, Carlos
In the SNO data from its salt run, probably the most significant result is the consistency with the previous results without assuming the 8B energy spectrum. In addition, they have excluded the...
Technicolorful Supersymmetry (2003)
Technicolor achieves electroweak symmetry breaking (EWSB) in an elegant and natural way, while it suffers from severe model building difficulties. I propose to abandon its secondary goal to eliminate...
CPT Tests: Kaon vs Neutrinos (2003)
CPT violation has an impressive limit in the neutral kaon system |m(K^0) - m(\bar{K}^0)| < 10^{-18} m_K = 0.50 \times 10^{-18} GeV. However, if viewed as a constraint on the mass-squared, the bound...
Matrix Model Description of Baryonic Deformations (2003)
Bena, Iosif, Murayama, Hitoshi, Roiban, Radu, Tatar, Radu
We investigate supersymmetric QCD with N_c+1 flavors using an extension of the recently proposed relation between gauge theories and matrix models. The impressive agreement between the two sides...
WMAPping out Neutrino Masses (2003)
Pierce, Aaron, Murayama, Hitoshi
Recent data from from the Wilkinson Microwave Anisotropy Probe (WMAP) place important bounds on the neutrino sector. The precise determination of the baryon number in the universe puts a strong...
Statistical Test of Anarchy (2003)
De Gouvea, Andre, Murayama, Hitoshi
"Anarchy" is the hypothesis that there is no fundamental distinction among the three flavors of neutrinos. It describes the mixing angles as random variables, drawn from well defined probability...
Atmospheric Neutrinos Can Make Beauty Strange (2002)
Harnik, Roni, Larson, Daniel T., Murayama, Hitoshi, Pierce, Aaron
The large observed mixing angle in atmospheric neutrinos, coupled with Grand Unification, motivates the search for a large mixing between right-handed strange and bottom squarks. Such mixing does not...
Atmospheric neutrinos can make beauty strange (2002)
Harnik, Roni, Larson, Daniel T., Murayama, Hitoshi, Pierce, Aaron
The large observed mixing angle in atmospheric neutrinos, coupled with Grand Unification, motivates the search for a large mixing between right-handed strange and bottom squarks. Such mixing does not...
CMB Anisotropy from Baryogenesis by a Scalar Field (2002)
Moroi, Takeo, Murayama, Hitoshi
We study the cosmic microwave background (CMB) anisotropy in the scenario where the baryon asymmetry of the universe is generated from a condensation of a scalar field. In such a scenario, the scalar...
Standard Model Higgs from Higher Dimensional Gauge Fields (2002)
Csaki, Csaba, Grojean, Christophe, Murayama, Hitoshi
We consider the possibility that the standard model Higgs fields may originate from extra components of higher dimensional gauge fields. Theories of this type considered before have had problems...
Supergravity Inflation Free from Harmful Relics (2002)
Greene, Patrick B., Kadota, Kenji, Murayama, Hitoshi
We present a realistic supergravity inflation model which is free from the overproduction of potentially dangerous relics in cosmology, namely moduli and gravitinos which can lead to the...
GUT, Neutrinos, and Baryogenesis (2002)
It is an exciting time for flavor physics. In this talk, I discuss recent topics in baryogenesis and leptogenesis in light of new data, and implications in B and neutrino physics. I also discuss...
Realistic Dirac Leptogenesis (2002)
Murayama, Hitoshi, Pierce, Aaron
We present a model of leptogenesis that preserves lepton number. The model maintains the important feature of more traditional leptogenesis scenarios: the decaying particles that provide the CP...
Domain Walls as Dark Energy (2002)
Friedland, Alexander, Murayama, Hitoshi, Perelstein, Maxim
The possibility that the energy density of the Universe is dominated by a network of low-tension domain walls provides an alternative to the commonly discussed cosmological constant and scalar-field...
Flavor in Supersymmetry (2002)
This lecture was given at TASI 2000, Flaovor Physics in the New Millennium, July, 2000, Boulder, Colorado. It reviews supersymmetry and emphasizes its flavor physics aspects.
Neutrino mixing and large CP violation in B physics (2002)
Chang, Darwin, Masiero, Antonio, Murayama, Hitoshi
We show that in see-saw models of neutrino mass a la SUSY SO(10), the observed large mixing in atmospheric neutrinos naturally leads to large b-s transitions. If the associated new CP phase turns out...
Purely Four-dimensional Viable Anomaly Mediation (2002)
Harnik, Roni, Murayama, Hitoshi, Pierce, Aaron
Anomaly mediation of supersymmetry breaking solves the supersymmetric flavor problem thanks to its ultraviolet-insensitivity. However, it suffers from two problems: sleptons have negative...
Theory of Neutrino Masses and Mixings (2002)
Neutrino physics is going through a revolutionary progress. In this talk I review what we have learned and why neutrino mass is so important. Neutrino masses and mixings are already shedding new...
New Theories With Quantum Modified Moduli Space (2001)
Murayama, Hitoshi, Perazzi, Elena
Kutasov--type duals of supersymmetric gauge theories had been studied only in the dual regime and the s-confining case. Here we extend the discussion to the case of less flavor, analogous to the case...
Leptogenesis from $\widetilde{N}$-dominated early universe (2001)
Hamaguchi, K., Murayama, Hitoshi, Yanagida, T.
We investigate in detail the leptogenesis by the decay of coherent right-handed sneutrino $\widetilde{N}$ having dominated the energy density of the early universe, which was originally proposed by...
Graviton emission from a soft brane (2001)
Murayama, Hitoshi, Wells, James D.
Theories with compact extra spatial dimensions felt only by gravity are subject to direct experimental tests if the compactification volume is large. Estimates of high-energy collider observables...
Not Even Decoupling Can Save Minimal Supersymmetric SU(5) (2001)
Murayama, Hitoshi, Pierce, Aaron
We make explicit the statement that Minimal Supersymmetric SU(5) has been excluded by the Super-Kamiokande search for the process $p \to K^{+} \overline{\nu}$. This exclusion is made by first placing...
Gravitino Warm Dark Matter with Entropy Production (2001)
Baltz, Edward A., Murayama, Hitoshi
Gravitinos with a mass in the keV range are an interesting candidate for warm dark matter. Recent measurements of the matter density of the universe and of cosmic structures at the dwarf galaxy scale...
Wilson Lines and Symmetry Breaking on Orbifolds (2001)
Hall, Lawrence J., Murayama, Hitoshi, Nomura, Yasunori
Gauge symmetry breaking by boundary conditions on a manifold is known to be equivalent to Wilson-line breaking through a background gauge field, and is therefore spontaneous. These equivalent...
DREDed Anomaly Mediation (2001)
Boyda, Ed, Murayama, Hitoshi, Pierce, Aaron
We offer a guide to dimensional reduction (DRED) in theories with anomaly mediated supersymmetry breaking. Evanescent operators proportional to epsilon arise in the bare Lagrangian when it is reduced...
Vacuum Structure and Flavor Symmetry Breaking in Supersymmetric SO(n_c) Gauge Theories (2001)
Carlino, Giuseppe, Konishi, Kenichi, Kumar, S. Prem, Murayama, Hitoshi
We determine the vacuum structure and phases of N=1 theories obtained via a mass \mu for the adjoint chiral superfield in N=2, SO(n_c) SQCD. For large number of flavors these theories have two groups...
Can Supersymmetric Loops Correct the Fermion Mass Relations in SU(5)? (2000)
Diaz-Cruz, J. Lorenzo, Murayama, Hitoshi, Pierce, Aaron
We investigate three different possibilities for improving the fermion mass relations that arise in grand unified theories (GUTs). Each scenario relies on supersymmetric loop effects alone, without...
Viable Ultraviolet-Insensitive Supersymmetry Breaking (2000)
Arkani-Hamed, Nima, Kaplan, David E., Murayama, Hitoshi, Nomura, Yasunori
It is known that one can add D-term contributions for U(1)_Y and U(1)_{B-L} to the anomaly-mediated supersymmetry breaking to make the superparticle spectrum phenomenologically viable. We point out...
LSND, SN1987A, and CPT Violation (2000)
Murayama, Hitoshi, Yanagida, T.
We point out that neutrino events observed at Kamiokande and IMB from SN1987A disfavor the neutrino oscillation parameters preferred by the LSND experiment. For $\Delta m^2 > 0$ (the light side), the...
LSND, SN1987A, and CPT violation (2000)
Murayama, Hitoshi, Yanagida, T.
We point out that neutrino events observed at Kamiokande and IMB from SN1987A disfavor the neutrino oscillation parameters preferred by the LSND experiment. For Delta m2 > 0 (the light side), the...
Neutrino masses at v3/2 (2000)
Arkani-Hamed, Nima, Hall, Lawrence, Murayama, Hitoshi, Smith, David, Weiner, Neal
Dynamical (Super)Symmetry Breaking (2000)
Dynamical Symmetry Breaking (DSB) is a concept theorists rely on very often in the discussions of strong dynamics, model building, and hierarchy problems. In this talk, I will discuss why this is...
Dynamical (super) symmetry breaking (2000)
Dynamical Symmetry Breaking (DSB) is a concept theorists rely on very often in the discussions of strong dynamics, model building, and hierarchy problems. In this talk, I will discuss why this is...
Confinement and Flavor Symmetry Breaking via Monopole Condensation (2000)
We discuss dynamics of N=2 supersymmetric SU(n_c) gauge theories with n_f quark hypermultiplets. Upon N=1 perturbation of introducing a finite mass for the adjoint chiral multiplet, we show that the...
Confinement and flavor symmetry breaking via monopole condensation (2000)
We discuss dynamics of N=2 supersymmetric SU(n_c) gauge theories with n_f quark hypermultiplets. Upon N=1 perturbation of introducing a finite mass for the adjoint chiral multiplet, we show that the...
Haba, Naoyuki, Murayama, Hitoshi
We advocate a new approach to study models of fermion masses and mixings, namely anarchy proposed in hep-ph/9911341. In this approach, we scan the O(1) coefficients randomly. We argue that this is...
Haba, Naoyuki, Murayama, Hitoshi
We advocate a new approach to study models of fermion masses and mixings, namely anarchy proposed in hep-ph/9911341. In this approach, we scan the O(1) coefficients randomly. We argue that this is...
Neutrino Masses at v^{3/2} (2000)
Arkani-Hamed, Nima, Hall, Lawrence, Murayama, Hitoshi, Smith, David, Weiner, Neal
Theories in which neutrino masses are generated by a conventional see-saw mechanism generically yield masses which are O(v^2) in units where M_{Pl}=1, which is naively too small to explain the...
Small Neutrino Masses from Supersymmetry Breaking (2000)
Arkani-Hamed, Nima, Hall, Lawrence, Murayama, Hitoshi, Smith, David, Weiner, Neal
An alternative to the conventional see-saw mechanism is proposed to explain the origin of small neutrino masses in supersymmetric theories. The masses and couplings of the right-handed neutrino field...
Dynamical Symmetry Breaking in Supersymmetric SU(n_c) and USp(2n_c) Gauge Theories (2000)
Carlino, Giuseppe, Konishi, Kenichi, Murayama, Hitoshi
We find the phase and flavor symmetry breaking pattern of each N=1 supersymmetric vacuum of SU(n_c) and USp(2 n_c) gauge theories, constructed from the exactly solvable N=2 theories by perturbing...