Method for flavor tagging in neutral<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>meson decays

Gronau, Michael; Nippe, A.; Rosner, Jonathan L.

doi:10.1103/physrevd.47.1988

Cited by 58 publications

(60 citation statements)

References 22 publications

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“…The dynamics of B meson production affords several methods for identifying this flavor. "Same-side" tagging methods [5,6,7,8] utilize the correlation of the flavor of a neutral B with the charge of a kaon or pion which is produced near it in phase space. "Opposite-side" methods utilize the associated production of bb in electromagnetic or strong interactions to tag a neutral B using the fragmentation products of the quark produced in association with it.…”

Section: Introductionmentioning

confidence: 99%

Erratum: Tests for coherence in neutralBmeson decays [Phys. Rev. D 63, 054006 (2001)]

Gronau¹,

Rosner²

2001

Phys. Rev. D

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A density-matrix method for the study of tagged states of neutral B mesons with arbitrary coherence properties is applied to several examples, including e + e − production both at and above the Υ(4S) resonance, and hadronic production. In the absence of coherence the only term modulating the exponential decay of a neutral B meson behaves as cos ∆mt, while a sin ∆mt modulation is a signal of partial or full coherence. Decays to CP eigenstates are needed to fully specify the density matrix. We relate these results to more familiar expressions for the cases of the Υ(4S) and incoherent production. I IntroductionNeutral B mesons undergo time-dependent oscillations with their antiparticles. This feature, first demonstrated for neutral kaons nearly half a century ago [1], has been crucial in extracting fundamental information on the mechanism of CP violation from the decays of neutral B's. Moreover, the oscillations themselves have provided crucial information on the magnitude of electroweak couplings, and were one of the first pieces of evidence for a very heavy top quark [2].The oscillations are characterized by splittings ∆m between mass eigenstates. For the B d =bd, the most recent world average [3] is ∆m d = 0.487 ± 0.014 ps −1 . For the B s =bs, only a lower limit [3,4] ∆m s > 15 ps −1 exists at present.1 To be submitted to Phys. Rev. D.

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Section: Introductionmentioning

confidence: 99%

Erratum: Tests for coherence in neutralBmeson decays [Phys. Rev. D 63, 054006 (2001)]

Gronau¹,

Rosner²

2001

Phys. Rev. D

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“…This standard model background could be significant since B 0 ↔ B 0 oscillations are non-negligible. Self-tagging of the heavy flavor at production to determine its sign [7], or measuring total jet charge after decay to isolate D ± mesons which do not oscillate could reduce this background, but requires large statistics, and is probably not applicable at the discovery level.…”

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confidence: 99%

Mesino-Antimesino Oscillations

Sarid

Thomas

2000

Phys. Rev. Lett.

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The phenomenological implications of supersymmetric theories with low scale supersymmetry breaking and a squark as the lightest standard model superpartner are investigated. Such squarks hadronize with light quarks, forming sbaryons and mesinos before decaying. Production of these supersymmetric bound states at a high energy collider can lead to displaced jets with large negative impact parameter. Neutral mesino-antimesino oscillations are not forbidden by any symmetry and can occur at observable rates with distinctive signatures. Stop mesino-antimesino oscillations would give a sensitive probe of up-type sflavor violation in the squark sector, and can provide a discovery channel for supersymmetry through events with a same-sign top-top topology. Supersymmetry (SUSY) allows the standard model to be embedded in more fundamental theories characterized by much higher energy scales, such as the Grand Unified or Planck scales, by stabilizing the electroweak scale against quadratic radiative corrections. In order to maintain this stability, the supersymmetry breaking masses for the superpartners of the ordinary particles should be of order the electroweak scale. However, the underlying mechanism and scale of this spontaneous breaking, as well as the superpartner spectrum, remain at present largely unknown.If the intrinsic scale of spontaneous supersymmetry breaking is below a scale intermediate between the electroweak and Planck scales, the lightest supersymmetric particle (LSP) is the gravitino superpartner of the graviton. The identity of the next-to-lightest supersymmetric particle (NLSP) is model-dependent, and largely determines the phenomenological signatures for supersymmetry [1].In this letter the consequences of a squark NLSP are explored. While perhaps unconventional, a squark NLSP can occur in theories of gauge-mediated supersymmetry breaking in which the strongly interacting messenger fields have suppressed couplings to spontaneous supersymmetry breaking. Beyond the theoretical motivation, this scenario leads to very novel phenomenology. Squarks hadronize in sbaryon or mesino bound states. Decay of these states can give rise to displaced jets with angular distributions which differ significantly from displaced jets from heavy quark decay. In addition, neutral mesinoantimesino oscillations are not forbidden and could provide a very sensitive probe of sflavor violation in the squark sector. Rather than representing a very specialized measurement which could only be attempted once the existence of superpartners is established, mesinoantimesino oscillations can in fact provide a discovery channel for SUSY at high energy colliders.Squark Decay and Hadronization.-With low scale supersymmetry breaking and conserved R-parity, the NLSP is metastable. The only available coupling for decay is through the Goldstino components,G, of the gravitino. The two-body decay rate for an up-type squark NLSP, Q → q G, including general (s)flavor misalignment between the quark and squark mass eigenstates, is given bywhere √ F is t...

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“…If the rate of production of charged and neutral B's is equal, as is expected to be the case for high-energy e + e − collisions [4], one can compare the rates for J/ψK + and J/ψK S production, making use of the fact that the decays of B mesons to J/ψK involve the quark subprocess b → ccs, which conserves isospin [10].…”

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confidence: 99%

“…As in semileptonic tagging at high energy, the initial B 0 and B 0 states were assumed in Ref. [4] to be incoherent with one another.…”

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Framework for identification of neutralBmesons

Gronau¹,

Rosner²

1994

Phys. Rev. Lett.

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We introduce a method for the study of CP-violating asymmetries in tagged states of neutral B mesons with arbitrary coherence properties. A set of time-dependent measurements is identified which completely specifies the density matrix of the initial state in a two-component space with basis vectors B 0 and B 0 , and permits a determination of phases in the Cabibbo-Kobayashi-Maskawa matrix. For a given tagging configuration, the measurement of decays both to flavor eigenstates and to CP eigenstates provides the necessary information.

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Method for flavor tagging in neutralBmeson decays

Cited by 58 publications

References 22 publications

Erratum: Tests for coherence in neutralBmeson decays [Phys. Rev. D 63, 054006 (2001)]

Erratum: Tests for coherence in neutralBmeson decays [Phys. Rev. D 63, 054006 (2001)]

Mesino-Antimesino Oscillations

Framework for identification of neutralBmesons

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