Splitting of Macroscopic Fundamental Strings in Flat Space and Holographic Hadron Decays

Bigazzi, Francesco; Cotrone, Aldo L.; Martucci, Luca; Troost, Walter

doi:10.1142/s0217732307023626

Cited by 2 publications

(3 citation statements)

References 27 publications

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“…In recent years there have also been attempts to describe hadrons in terms of strings. Papers on the subject that have certain overlap with our approach are [23][24][25][26][27][28][29][30][31][32][33][34]. A somewhat different approach to the stringy nature of QCD, at least conceptually, is the approach of low-energy effective theory on long strings reviewed in [35].…”

Section: A Brief Review Of the Hish Modelmentioning

confidence: 99%

Excited mesons, baryons, glueballs and tetraquarks: predictions of the Holography Inspired Stringy Hadron model

Sonnenschein

Weissman

2019

Eur. Phys. J. C

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In this note we collect and summarize the predictions of the Holography Inspired Stringy Hadron (HISH) model. Following a brief review of the model, we list the masses and widths of predicted excited states across the spectrum, based on placing the different hadrons on the non-linear Regge trajectories of a string with massive endpoints. Our predicted states include: (i) Light, heavy-light and heavy-heavy mesons. (ii) Baryons, including charmed, doubly charmed and bottom baryons. (iii) Glueballs, together with a method to disentangle them from flavorless mesons. (iv) Genuine tetraquarks, which are not "molecules" of hadrons, and are characterized by their decay into a baryon and an anti-baryon.

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Section: A Brief Review Of the Hish Modelmentioning

confidence: 99%

Excited mesons, baryons, glueballs and tetraquarks: predictions of the Holography Inspired Stringy Hadron model

Sonnenschein

Weissman

2019

Eur. Phys. J. C

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“…The first treatments of the problem were given in [7][8][9][10]62]. Since then, it was further addressed in the context of the decay of mesons in [34,44,[63][64][65][66][67][68][69][70][71][72][73][74].…”

Section: The Decay Of An Open String In Flat Spacetime In Critical DImentioning

confidence: 99%

“…A calculation of the probability of the fluctuations of the horizontal segment of a hadronic string to reach a flavor brane was first performed in [14]. It was further discussed in [34,71,73]. In the following lines we review the analysis of [14] and then discuss further corrections to the basic computation of aspects of the probability.…”

Section: The Suppression Factor For Stringy Holographic Hadronsmentioning

confidence: 99%

The decay width of stringy hadrons

Sonnenschein

Weissman

2018

Nuclear Physics B

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In this paper we further develop a string model of hadrons by computing their strong decay widths and comparing them to experiment. The main decay mechanism is that of a string splitting into two strings. The corresponding total decay width behaves as $\Gamma=\frac\pi2 ATL$ where $T$ and $L$ are the tension and length of the string and $A$ is a dimensionless universal constant. We show that this result holds for a bosonic string not only in the critical dimension. The partial width of a given decay mode is given by $\Gamma_i/\Gamma=\Phi_i\exp(-2\pi Cm_{sep}^2/T)$ where $\Phi_i$ is a phase space factor, $m_{sep}$ is the mass of the "quark" and "antiquark" created at the splitting point, and $C$ is a dimensionless coefficient close to unity. Based on the spectra of hadrons we observe that their (modified) Regge trajectories are characterized by a negative intercept. This implies a repulsive Casimir force that gives the string a "zero point length". We fit the theoretical decay width to experimental data for mesons on the trajectories of $\rho$, $\omega$, $\pi$, $\eta$, $K^*$, $\phi$, $D$, and $D^*_s$, and of the baryons $N$, $\Delta$, $\Lambda$, and $\Sigma$. We examine both the linearity in $L$ and the exponential suppression factor. The linearity was found to agree with the data well for mesons but less for baryons. The extracted coefficient for mesons $A=0.095\pm0.015$ is indeed quite universal. The exponential suppression was applied to both strong and radiative decays. We discuss the relation with string fragmentation and jet formation. We extract the quark-diquark structure of baryons from their decays. A stringy mechanism for Zweig suppressed decays of quarkonia is proposed and is shown to reproduce the decay width of $\Upsilon$ states. The dependence of the width on spin and flavor symmetry is discussed. We further apply this model to the decays of glueballs and exotic hadrons.Comment: v1: 98 pages / v2: minor revisions, references added, 100 pages (41 figures) / v3: final published version, minor corrections, 100 page

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Splitting of Macroscopic Fundamental Strings in Flat Space and Holographic Hadron Decays

Cited by 2 publications

References 27 publications

Excited mesons, baryons, glueballs and tetraquarks: predictions of the Holography Inspired Stringy Hadron model

Excited mesons, baryons, glueballs and tetraquarks: predictions of the Holography Inspired Stringy Hadron model

The decay width of stringy hadrons

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