Inclusive production of the X(3872)
Abstract
If the X(3872) is a looselybound D*{sup 0}D{sup 0}/D{sup 0}D*{sup 0} molecule, its inclusive production rate can be described by the NRQCD factorization formalism that applies to inclusive quarkonium production. We argue that if the molecule has quantum numbers J{sup PC}=1{sup ++}, the most important term in the factorization formula should be the coloroctet {sup 3}S{sub 1} term. This is also one of the two most important terms in the factorization formulas for {chi}{sub cJ}. Since the coloroctet {sup 3}S{sub 1} term dominates {chi}{sub cJ} production for many processes, the ratio of the inclusive direct production rates for X and {chi}{sub cJ} should be roughly the same for these processes. The assumption that the ratio of the production rates for X and {chi}{sub cJ} is the same for all processes is used to estimate the inclusive production rate of X in B meson decays, Z{sup 0} decays, and in pp collisions.
 Authors:
 Physics Department, Ohio State University, Columbus, Ohio 43210 (United States)
 Publication Date:
 OSTI Identifier:
 20774566
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.73.011501; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B MESONS; COLOR MODEL; D MESONS; D*2010 MESONS; FACTORIZATION; HADRONIC PARTICLE DECAY; INCLUSIVE INTERACTIONS; MESIC MOLECULES; PARITY; PARTICLE PRODUCTION; PROTONPROTON INTERACTIONS; QUANTUM CHROMODYNAMICS; QUANTUM NUMBERS; QUARKONIUM; SPIN; Z NEUTRAL BOSONS
Citation Formats
Braaten, Eric. Inclusive production of the X(3872). United States: N. p., 2006.
Web. doi:10.1103/PhysRevD.73.011501.
Braaten, Eric. Inclusive production of the X(3872). United States. doi:10.1103/PhysRevD.73.011501.
Braaten, Eric. Sun .
"Inclusive production of the X(3872)". United States.
doi:10.1103/PhysRevD.73.011501.
@article{osti_20774566,
title = {Inclusive production of the X(3872)},
author = {Braaten, Eric},
abstractNote = {If the X(3872) is a looselybound D*{sup 0}D{sup 0}/D{sup 0}D*{sup 0} molecule, its inclusive production rate can be described by the NRQCD factorization formalism that applies to inclusive quarkonium production. We argue that if the molecule has quantum numbers J{sup PC}=1{sup ++}, the most important term in the factorization formula should be the coloroctet {sup 3}S{sub 1} term. This is also one of the two most important terms in the factorization formulas for {chi}{sub cJ}. Since the coloroctet {sup 3}S{sub 1} term dominates {chi}{sub cJ} production for many processes, the ratio of the inclusive direct production rates for X and {chi}{sub cJ} should be roughly the same for these processes. The assumption that the ratio of the production rates for X and {chi}{sub cJ} is the same for all processes is used to estimate the inclusive production rate of X in B meson decays, Z{sup 0} decays, and in pp collisions.},
doi = {10.1103/PhysRevD.73.011501},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}

The production of the X(3872) is studied in pp collisions at sqrt(s) = 7 TeV, using decays to J/psi pi pi, where the J/psi decays to two muons. The data were recorded by the CMS experiment and correspond to an integrated luminosity of 4.8 inverse femtobarns. The measurements are performed in a kinematic range in which the X(3872) candidates have a transverse momentum 10 < pt < 50 GeV and rapidity abs(y) < 1.2. The ratio of the X(3872) and psi(2S) cross sections times their branching fractions into J/psi pi pi is measured as a function of pt. In addition,more »

Exclusive production of the X(3872) in B meson decay
If the recently discovered charmoniumlike state X(3872) is a loosely bound Swave molecule of the charm mesons D{sup 0}D*{sup 0} or D*{sup 0}D{sup 0}, it can be produced through the weak decay of the B meson into D{sup 0}D*{sup 0}K or D*{sup 0}D{sup 0}K followed by the coalescence of the charm mesons at a longdistance scale set by the scattering length of the charm mesons. The longdistance factors in the amplitude for the decay B{yields}XK are determined by the binding energy of X, while the shortdistance factors are essentially determined by the amplitudes for B{yields}D{sup 0}D*{sup 0}K and B{yields}D*{sup 0}D{supmore » 
Factorization in the production and decay of the X(3872)
The production and decay of the X(3872) are analyzed under the assumption that the X is a weakly bound molecule of the charm mesons D{sup 0}D*{sup 0} and D*{sup 0}D{sup 0}. The decays imply that the large D{sup 0}D*{sup 0} scattering length has an imaginary part. An effective field theory for particles with a large complex scattering length is used to derive factorization formulas for production rates and decay rates of X. If a partial width is calculated in a model with a particular value of the binding energy, the factorization formula can be used to extrapolate to other valuesmore » 
Operator product expansion in the production and decay of the X(3872)
The X(3872) seems to be a weakly bound hadronic molecule whose constituents are two charm mesons. Its binding energy is much smaller than all the other energy scales in QCD. This separation of scales can be exploited through factorization formulas for production and decay rates of the X. In a lowenergy effective field theory for the constituents of the X, the factorization formulas can be derived using the operator product expansion. The derivations are carried out explicitly for the simplest effective theory in which the constituents interact through a contact interaction that produces a large scattering length. The longdistance factorsmore » 
Search for prompt production of {chi}{sub c} and X(3872) in e{sup +}e{sup } annihilations
We have searched for prompt production of {chi}{sub c1}, {chi}{sub c2} and X(3872) in continuum e{sup +}e{sup } annihilations using a 386 fb{sup 1} data sample collected around {radical}(s)=10.6 GeV with the BABAR detector using the {gamma}J/{psi} decay mode. After accounting for the feeddown from {psi}(2S){yields}{gamma}{chi}{sub c1,2}, no significant signal for prompt {chi}{sub c1,2} production is observed. We present improved upper limits at 90% confidence level on the production cross sections of 77 fb for {chi}{sub c1} and 79 fb for {chi}{sub c2}, for events where the {chi}{sub c} momentum exceeds 2.0 GeV and there are at least three additionalmore »