Masses and magnetic moments of pentaquarks

نویسنده

  • R. Bijker
چکیده

We discuss the spectroscopy of the recently discovered exotic baryons as pentaquark qq̄ configurations. The ground state pentaquark configuration depends on the interplay between spin-flavor and orbital contributions to the mass operator. A simple calculation in an algebraic model gives a ground state antidecuplet pentaquark with isospin I = 0 and negative parity. The lowest pentaquark with positive parity is an antidecuplet isosinglet Θ state at an excitation energy of 128 MeV. The corresponding magnetic moments are found to be 0.382 μN for the negative parity Θ + pentaquark, and 0.089 μN for positive parity. PACS numbers: 14.20.Jn, 12.39.Mk, 13.40.Em, 12.39.-x

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Magnetic moments of antidecuplet pentaquarks

We analyze the magnetic moments of the exotic pentaquarks of the flavor antidecuplet in the constituent quark model for the case in which the ground state is in an orbital L = 0 or a L = 1− state. We derive sum rules for the magnetic moments. The magnetic moment of the Θ(1540) is found to be 0.38, 0.09 and 1.05 μN for J p = 1/2−, 1/2 and 3/2, respectively, which is compared with the results obt...

متن کامل

History and new ideas for exotic particles

Basic 1966 physics of Sakharov, Zeldovich and Nambu updated by QCD with constituent-quark quasiparticles having effective masses fits all masses and magnetic moments of ground state meson and baryons having no more than one strange or heavy quark Flavor antisymmetry explains absence of lowlying exotics and suggests diquark-triquark model and two-state model for Θ+ pentaquark. Variational approa...

متن کامل

Magnetic Moments of JP = 3+ 2

If the J of Θ5 and Ξ −− 5 pentaquarks is really found to be 1 2 + by future experiments, they will be accompanied by J = 32 + partners in some models. It is reasonable to expect that these J = 3 2 + states will also be discovered in the near future with the current intensive experimental and theoretical efforts. We estimate J = 32 + pentaquark magnetic moments using different models.

متن کامل

Magnetic moments of S-shell pentaquarks in the additive quark model

We discuss the magnetic moments of the recently discovered exotic baryons Θ+ and Ξ and their multiplet partners in the framework of a naive additive quark model. These baryons are set up as pentaquark states where four quarks and a single antiquark are located in their ground state orbit. The pentaquark states are classified as members of the flavor SU(3) octet and antidecuplet with spin-parity...

متن کامل

Magnetic Moments, Hadron Masses, and Quark Masses

Two independent quark-model predictions of the A magnetic moments, in agreement with one another and with experiment to 1%, are obtained by using two different inputs for SU(3) breaking in quark masses: (1) (m, /m„) =(Mq. —Mq)/(M~-Mn); and (2) m, —ni„ =M p, —Mz. I discuss the implications of the surprising sucess of a description of quark magnetic moments as Dirac moments with quark masses rela...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2003