Physical Sciences and Mathematics | Open Access Articles

Precision Measurement Of The Ratio Β(Y(3S) → Τ + Τ−) / Β( Y(3S)→ Μ+ Μ−, J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, R. Cheaib, C. Hearty, T. S. Mattison, J. A. Mckenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, Milind Purohit, Et. Al.

Faculty Publications

We report on a precision measurement of the ratio Rϒð3SÞ τμ ¼ Bðϒð3SÞ → τþτ−Þ=Bðϒð3SÞ → μþμ−Þ using data collected with the BABAR detector at the SLAC PEP-II eþe− collider. The measurement is based on a 28 fb−1 data sample collected at a center-of-mass energy of 10.355 GeV corresponding to a sample of 122 million ϒð3SÞ mesons. The ratio is measured to be Rϒð3SÞ τμ ¼ 0.966 0.008stat 0.014syst and is in agreement with the standard model prediction of 0.9948 within 2 standard deviations. The uncertainty in Rϒð3SÞ τμ is almost an order of magnitude smaller than the only previous …

Go to article

First Results On Protodune-Sp Liquid Argon Time Projection Chamber Performance From A Beam Test At The Cern Neutrino Platform, B. Abi, A. Abed Abud, R. Acciarri, M. A. Acero, G. Adamowski, D. Adams, P. Adrien, M. Adinolfi, Z. Ahmad, J. Ahmed, T. Alion, S. Alonso Monsalve, C. Alt, J. Anderson, C. Andreopoulos, M. P. Andrews, F. Andrianala, S. Andringa, A. Ankowski, M. Antonova, Roberto Petti, Et. Al.

Faculty Publications

The ProtoDUNE-SP detector is a single-phase liquid argon time projection chamber with an active volume of 7.2 × 6.1 × 7.0 m³ . It is installed at the CERN Neutrino Platform in a specially-constructed beam that delivers charged pions, kaons, protons, muons and electrons with momenta in the range 0.3 GeV/�� to 7 GeV/��. Beam line instrumentation provides accurate momentum measurements and particle identification. The ProtoDUNE-SP detector is a prototype for the first far detector module of the Deep Underground Neutrino Experiment, and it incorporates full-size components as designed for that module. This paper describes the beam line, the …

Go to article

Neutrino Interaction Classification With A Convolutional Neural Network In The Dune Far Detector, B. Abi, R. Acciarri, M. A. Acero, G. Adamov, D. Adams, M. Adinolfi, Z. Ahmad, J. Ahmed, T. Alion, S. Alonso Monsalve, C. Alt, J.. Anderson, C. Andreopoulos, M. P. Andrews, F. Andrianala, S. Andringa, A. Ankowski, M. Antonova, S. Antusch, A. Aranda-Fernadez, Roberto Petti, Et. Al.

Faculty Publications

The Deep Underground Neutrino Experiment is a next-generation neutrino oscillation experiment that aims to measure CP-violation in the neutrino sector as part of a wider physics program. A deep learning approach based on a convolutional neural network has been developed to provide highly efficient and pure selections of electron neutrino and muon neutrino charged-current interactions. The electron neutrino (antineutrino) selection efficiency peaks at 90% (94%) and exceeds 85% (90%) for reconstructed neutrino energies between 2–5 GeV. The muon neutrino (antineutrino) event selection is found to have a maximum efficiency of 96% (97%) and exceeds 90% (95%) efficiency for reconstructed …

Go to article

Search For A Dark Leptophilic Scalar In E + E − Collisions, J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, R. Cheaib, C. Hearty, T. S. Mattison, J. A. Mckenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, Milind Purohit, Et. Al.

Faculty Publications

Many scenarios of physics beyond the standard model predict the existence of new gauge singlets, which might be substantially lighter than the weak scale. The experimental constraints on additional scalars with masses in the MeV to GeV range could be significantly weakened if they interact predominantly with leptons rather than quarks. At an e⁺e⁻ collider, such a leptophilic scalar (_ϕL) would be produced predominantly through radiation from a τ lepton. We report herein a search for e⁺e⁻→ τ⁺τ⁻_ϕL, _ϕL → l⁺l⁻ (l = …

Go to article

Long-Baseline Neutrino Oscillation Physics Potential Of The Dune Experiment, B. Abi, M. A. Acero, G. Adamov, D. Adams, M. Adinolfi, Z Ahmad, J. Ahmed, T. Alion, S. Alonso Monsalve, C. Alt, J. Anderson, C. Andreopoulos, M. P. Andrews, F. Andringa, A. Ankowski, M. Antonova, S. Antusch, A. Aranda-Fernandez, A. Ariga, L. O. Arnold, Roberto Petti, Et. Al.

Faculty Publications

The sensitivity of the Deep Underground Neutrino Experiment (DUNE) to neutrino oscillation is determined, based on a full simulation, reconstruction, and event selection of the far detector and a full simulation and parameterized analysis of the near detector. Detailed uncertainties due to the flux prediction, neutrino interaction model, and detector effects are included. DUNE will resolve the neutrino mass ordering to a precision of 5σ for δ_CPvalues, after 2 years of running with the nominal detector design and beam configuration. It has the potential to observe charge-parity violation in the neutrino sector to a precision of 3 …

Go to article

Search For Axionlike Particles Produced In E+E− Collisions At Belle Ii, F. Abudin´En, I. Adachi, H. Aihara, N. Akopov, A. Aloisio, F. Ameli, N. Anh Ky, D. M. Asner, T. Aushev, V. Aushev, V. Babu, S. Baehr, S. Bahinipati, P. Bambade, Sw. Banerjee, S. Bansal, J. Baudot, J. Becker, P. K. Behera, Milind Purohit

Faculty Publications

We present a search for the direct production of a light pseudoscalar a decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process e⁺e⁻→ γa, a → γγ in the mass range 0.2 < m_a < 9.7 GeV/c² using data corresponding to an integrated luminosity of (445± 3) pb⁻¹. Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axionlike particles or ALPs) are frequently postulated in extensions of the standard model. We find no evidence for ALPs and set 95% confidence level upper limits on the coupling …

Go to article

Top Hadrons In Lorentz-Violating Field Theory, Brett David Altschul

Faculty Publications

If there is Lorentz symmetry violation in the t quark sector of the standard model, changes to particles’ dispersion relations might allow for the existence of stable top-flavored hadrons. Observations of the survival of high-energy γ-rays over astrophysical distances can be used to place constraints on Lorentz violation coefficients in the t sector at ∼10⁻⁴–10⁻⁶ levels of precision.

Go to article

Problems With Lorentz Violation Originating From A Cosmologically Varying Pseudoscalar Field, Sapan Karki, Brett David Altschul

Faculty Publications

Lorentz- and CPT-violating models of electrodynamics with Chern-Simons terms are typically plagued by various sorts of instabilities. However, when the Chern-Simons term arises from a slow time variation in a pseudoscalar field with an axionlike electromagnetic coupling, the total energy of the theory is bounded below. We examine the behavior of such a theory, finding that in a systematic power series expansion of the magnetic and pseudoscalar fields, singularities appear in the field profiles. Some of the questionable behavior can be cured by taking a fully nonperturbative approach, but other problematic terms remain. This may be an indication that Cerenkov-like …

Go to article

Search For Lepton-Flavor-Violating Decays D0→X0E±Μ∓, J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, R. Cheaib, C. Hearty, T. S. Mattison, J. A. Mckenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, Milind Purohit, Et. Al.

Faculty Publications

We present a search for seven lepton-flavor-violating neutral charm meson decays of the type D⁰→X⁰e^±μ^∓, where X⁰ represents a π⁰, K⁰ _S S, K^0* ρ⁰, ϕ, ω, or η meson. The analysis is based on 468 fb⁻¹ of e⁺e^- annihilation data collected at or close to the Υ(4S)resonance with the BABAR detector at the SLAC National Accelerator Laboratory. No significant signals are observed, and we establish 90% confidence level upper limits on the branching fractions in …

Go to article

Search For An Invisibly Decaying Z' Boson At Belle Ii In E+ E− → Μ+ Μ− (E∓Μ∓)Plus Missing Energy Final States, I. Adachi, P. Ahlburg, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, T, Aziz, V. Babu, S. Baehr, P. Bambade, Sw. Banerjee, V. Bansal, M. Barrett, J. Baudot, J. Becker, Milind Purohit, Et. Al.

Faculty Publications

Theories beyond the standard model often predict the existence of an additional neutral boson, the Z'. Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a Z' e⁺e⁻→μ⁺μ⁻Z′ and of a lepton-flavor-violating Z' in e⁺e⁻→e^±μ^∓Z′. We do not find any excess of events and set 90% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an L_μ−L …

Go to article

Search For Rare Or Forbidden Decays Of The D0 Meson, J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu. G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, R. Cheaib, C. Hearty, T. S. Mattison, J. A. Mckenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, Milind Purohit

Faculty Publications

We present a search for nine lepton-number-violating and three lepton-flavor-violating neutral charm decays of the type D⁰ → h'−h⁻ℓ'⁺ℓ⁺ and D0→h'⁻h⁺ℓ'^±ℓ^∓, where h and h⁰ represent a K or π meson and ℓ and ℓ′ an electron or muon. The analysis is based on 468 fb⁻¹ of e⁺e⁻ annihilation data collected at or close to the ϒ(4S) resonance with the BABAR detector at the SLAC National Accelerator Laboratory. No significant signal is observed for any of the twelve modes, …

Go to article

Resonances In E+ E− Annihilation Near 2.2 Gev, J. P. Lees, V. Poireau, V. Tisserand, E. Grauges, A. Palano, G. Eigen, D. N. Brown, Yu G. Kolomensky, M. Fritsch, H. Koch, T. Schroeder, R. Cheaib, C. Hearty, T. S. Mattison, J. A. Mckenna, R. Y. So, V. E. Blinov, A. R. Buzykaev, V. P. Druzhinin, Milind Purohit, Et. Al.

Faculty Publications

Using the initial-state radiation method, the e⁺e⁻ → K_SK_L cross section from 1.98 to 2.54 GeV is measured in a data sample of 469 fb⁻¹ collected with the BABAR detector. The results are used in conjunction with previous BABAR results for the e⁺e⁻→ K⁺K⁻, e⁺e⁻ → π⁺π⁻, e⁺e⁻ → π⁺π⁻η, and e⁺e⁻ → ωππ cross sections to investigate the nature of the resonance structure recently observed by …

Go to article

Separability Of The Planar 1/Ρ2 Potential In Multiple Coordinate Systems, Richard Decosta, Brett David Altschul

Faculty Publications

With a number of special Hamiltonians, solutions of the Schrödinger equation may be found by separation of variables in more than one coordinate system. The class of potentials involved includes a number of important examples, including the isotropic harmonic oscillator and the Coulomb potential. Multiply separable Hamiltonians exhibit a number of interesting features, including “accidental” degeneracies in their bound state spectra and often classical bound state orbits that always close. We examine another potential, for which the Schrödinger equation is separable in both cylindrical and parabolic coordinates: A z-independent V��/ρ2=1/(x²+y²) in three dimensions. All the persistent, …

Go to article

Physical Sciences and Mathematics Commons^™

Full-Text Articles in Physical Sciences and Mathematics

Faculty Publications

Faculty Publications

Faculty Publications

Faculty Publications

Faculty Publications

Faculty Publications

Top Hadrons In Lorentz-Violating Field Theory, Brett David Altschul

Faculty Publications

Problems With Lorentz Violation Originating From A Cosmologically Varying Pseudoscalar Field, Sapan Karki, Brett David Altschul

Faculty Publications

Faculty Publications

Faculty Publications

Faculty Publications

Faculty Publications

Separability Of The Planar 1/Ρ2 Potential In Multiple Coordinate Systems, Richard Decosta, Brett David Altschul

Faculty Publications