From: Atsushi Hosaka
Date: Mon, 25 Jun 2012 01:12:28 +0900
To: sg-l__AT__yukawa.kyoto-u.ac.jp
Subject: [sg-l 7258] 第7回ハドロンスクエアのご案内

皆様、

新学術領域研究「多彩なフレーバーで探る新しいハドロン存在形態の包括的研究」（略称「新ハドロン」）では、総括班の取り組みのひとつとして、領域が目指す物理研究に関連するセミナーシリーズ「ハドロン・スクエア」を開催しています。

下記の通り、第７回目を大阪大学核物理研究センターで開催いたします。
次のURLにてもご案内しております。
http://www.rcnp.osaka-u.ac.jp/indico/conferenceDisplay.py?confId=399

皆様ふるってご参加ください。
＃旅費の補助をご希望の方は世話人までご相談ください。＃

「新ハドロン」総括班
飯嶋　徹（名古屋大）、堺井義秀（KEK）、 野海博之（RCNP）、延與秀人（理研）、保坂
淳（RCNP）、中野貴志（RCNP)、四日市悟（理研）、宮林謙吉（奈良女大）、原田正康（名古屋大）、中尾幹彦（KEK)

============記===========
第７回「ハドロン・スクエア」
日時：7月26日（木）１３：３０−１６：３０
場所：大阪大学核物理研究センター４階講義室
世話人: 阪大RCNP 野海博之、中野貴志、保坂　淳

13:30 - 14:20:
Photoproduction of Λ(1405) and ∑0(1385) on the proton
at Eγ=1.5-3.0GeV at SPring-8/LEPS
Speakers: Yohei Nakatsugawa (RCNP, Osaka University)

14:30 - 15:20:
Backward phi photo-production from C, and Cu targets
at E_gamma = 1.5-2.4 GeV
Speakers: Takahiro Sawada (RCNP, Osaka University)

15:30 - 16:20:
Molecular Interpretation of the XYZ states
Speakers: Raquel Molina (RCNP, Osaka University)

========================================================
講演の詳細
--------------------------------------------------------------
Photoproduction of Λ(1405) and ∑0(1385) on the proton
at Eγ=1.5-3.0GeV at SPring-8/LEPS
Speakers: Yohei Nakatsugawa (RCNP, Osaka University)
--------------------------------------------------------------
Abstract:
The Λ(1405) is assigned as a p-wave q3 baryon in a quark model.
However, it is also suggested that Λ(1405) has a non-q3 structure such
as a meson-baryon molecular state.
Some theoretical works using chiral Lagrangian and coupled unitary
model predict the line shape of Λ(1405) as π∑ and KbarN. Its 2-pole
structure is also suggested.
On the other hand, ∑0(1385) is firmly established as
a q3 state baryon.
The difference of the internal structure of Λ(1405) and ∑0(1385) may
appear in the photoproduction cross sections and/or photon beam
asymmetries of these two hyperons.
Recently, differential cross sections for γp -> K+Λ(1405) and γp ->
K+∑0(1385) reactions were measured by LEPS collaboration. However, the
statistics were limited.
A new experiment was carried out at SPring-8/LEPS with liquid hydrogen
target and linearly polarized photon beam.
In order to detect decay products of hadrons,
a time projection chamber(TPC) surrounding the target was used
together with the LEPS spectrometer.
In order to obtain the spectra of Λ(1405) and ∑0(1385) separately, we
extracted following two reactions using track informations of K+
detected by LEPS spectrometer and decay products detected by TPC.
(1) γp -> K+ ∑0(1385) -> K+ Λ π0 -> K+ p π- π0,
(2) γp -> K+ Λ(1405) -> K+ ∑+(-) π-(+) -> K+ n π+π-.
It is pointed out that because of a strong interference of the isospin
0 and 1 terms of the ∑π scattering amplitudes, the line shape of
Λ(1405) could be different in ∑-π+ and ∑+π- decay modes.
In order to separate both decay modes, a kinematic fit was applied.
The isospin interference term is cancelled by summing the spectra of
the ∑-π+ and ∑+π- modes.
The summed spectrum was obtained after correcting for the decay branch
of ∑+ -> pπ0.
Our goal is to obtain the cross sections and beam asymmetries of
Λ(1405) and ∑0(1385) and line shape of Λ(1405).
The status of analysis will be reported.


--------------------------------------------------------------
Backward phi photo-production from C, and Cu targets
at E_gamma = 1.5-2.4 GeV
Speakers: Takahiro Sawada (RCNP, Osaka University)
--------------------------------------------------------------
Abstract:
We have studied the phi meson photo-production from CH2, C, and Cu
nuclei at backward angle via the phi -> K+ K- decay channel.
The high energy photon beam with E = 1.5-2.4 GeV has been produced by
laser backward Compton scattering from 8 GeV electrons in the storage
ring of SPring-8.
In our earlier publication, we reported the measurement of phi meson
photo-production from Li, C, Al, and Cu targets at forward angle with
LEPS forward spectrometer,
in the phi momentum range of 1.0-2.2 GeV/c (Average 1.8 GeV/c).
In order to investigate low momentum region, we have performed the new
experiment.
A Time Projection Chamber　(TPC)　surrounding the target for enlarging
the detector acceptance was newly installed.
Combined use of this TPC and existing LEPS forward spectrometer
provided drastic increase of the detector acceptance covering the wide
momentum range of phi mesons 0.3-2.0 GeV/c.
It was first measurement of the photo-produced phi
mesons from nuclear targets with momentum less than 0.8 GeV/c.
In this talk, we would like to report the production cross section
ratio from C, Cu nuclei in our momentum region and discuss the
momentum dependence of the in-medium properties of phi meson.

--------------------------------------------------------------
Molecular Interpretation of the XYZ states
Speakers: Raquel Molina (RCNP, Osaka University)
--------------------------------------------------------------
Abstract:
The majority of the 'new’charmonium-like X, Y and Z mesons mainlyu
discovered at the B-factories BELLE and BaBar cannot be easily
accommodated in the qqbar model and are therefore interesting objects
for meson structure
besides the constituent quark model.
They are intriguingly close to the D*D*bar and Ds*Ds*bar thresholds
and there are several theoretical models
which test the hypothesis of D*D*bar ( or Ds*Ds*bar) molecular structure.
One of them is the coupled channel approach, which combined with the
Hidden Gauge Lagrangians, turned out to provide a useful tool to
determine the mass
and width of resonances [1].
In this talk we describe some of the X, Y, Z
states as dynamically generated resonances from the vector - vector
interaction. All the possible channels with quantum numbers charm = 0,
strangeness = 0 around the energy region of 4000 MeV are included. We
find
that some of the XYZ states (the Y(3940), Z(3930) and X(4160)) can fit
into this structure within the model.
A further interesting topic is the radiative decays of these states
which are also a crucial test to hadron structure.
Decay rates are also provided by the model [2] and recently we have
also evaluated the decay ratio of the X(3872) into J/ψγ.

[1] R. Molina and E. Oset, “The Y(3940), Z(3930) and the X(4160) as
dynamically generated resonances from the vector-vector interaction”
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Atsushi Hosaka
Date: Sat, 21 Jul 2012 17:47:09 +0900
To: sg-l__AT__yukawa.kyoto-u.ac.jp
Subject: [sg-l 7302] 再送:　第7回ハドロンスクエアのご案内

7月26日のセミナーについて再度ご案内します。
奮ってご参加ください。

皆様、

新学術領域研究「多彩なフレーバーで探る新しいハドロン存在形態の包括的研究」（略称「新ハドロン」）では、総括班の取り組みのひとつとして、領域が目指す物理研究に関連するセミナーシリーズ「ハドロン・スクエア」を開催しています。

下記の通り、第７回目を大阪大学核物理研究センターで開催いたします。
次のURLにてもご案内しております。
http://www.rcnp.osaka-u.ac.jp/indico/conferenceDisplay.py?confId=399

皆様ふるってご参加ください。
＃旅費の補助をご希望の方は世話人までご相談ください。＃

「新ハドロン」総括班
飯嶋　徹（名古屋大）、堺井義秀（KEK）、 野海博之（RCNP）、延與秀人（理研）、保\坂
淳（RCNP）、中野貴志（RCNP)、四日市悟（理研）、宮林謙吉（奈良女大）、原田正康（名古屋大）、中尾幹彦（KEK)

============記===========
第７回「ハドロン・スクエア」
日時：7月26日（木）１３：３０−１６：３０
場所：大阪大学核物理研究センター４階講義室
世話人: 阪大RCNP 野海博之、中野貴志、保坂　淳

13:30 - 14:20:
Photoproduction of Λ(1405) and ?0(1385) on the proton
at Eγ=1.5-3.0GeV at SPring-8/LEPS
Speakers: Yohei Nakatsugawa (RCNP, Osaka University)

14:30 - 15:20:
Backward phi photo-production from C, and Cu targets
at E_gamma = 1.5-2.4 GeV
Speakers: Takahiro Sawada (RCNP, Osaka University)

15:30 - 16:20:
Molecular Interpretation of the XYZ states
Speakers: Raquel Molina (RCNP, Osaka University)

========================================================
講演の詳細
--------------------------------------------------------------
Photoproduction of Λ(1405) and ?0(1385) on the proton
at Eγ=1.5-3.0GeV at SPring-8/LEPS
Speakers: Yohei Nakatsugawa (RCNP, Osaka University)
--------------------------------------------------------------
Abstract:
The Λ(1405) is assigned as a p-wave q3 baryon in a quark model.
However, it is also suggested that Λ(1405) has a non-q3 structure such
as a meson-baryon molecular state.
Some theoretical works using chiral Lagrangian and coupled unitary
model predict the line shape of Λ(1405) as π? and KbarN. Its 2-pole
structure is also suggested.
On the other hand, ?0(1385) is firmly established as
a q3 state baryon.
The difference of the internal structure of Λ(1405) and ?0(1385) may
appear in the photoproduction cross sections and/or photon beam
asymmetries of these two hyperons.
Recently, differential cross sections for γp -> K+Λ(1405) and γp ->
K+?0(1385) reactions were measured by LEPS collaboration. However, the
statistics were limited.
A new experiment was carried out at SPring-8/LEPS with liquid hydrogen
target and linearly polarized photon beam.
In order to detect decay products of hadrons,
a time projection chamber(TPC) surrounding the target was used
together with the LEPS spectrometer.
In order to obtain the spectra of Λ(1405) and ?0(1385) separately, we
extracted following two reactions using track informations of K+
detected by LEPS spectrometer and decay products detected by TPC.
(1) γp -> K+ ?0(1385) -> K+ Λ π0 -> K+ p π- π0,
(2) γp -> K+ Λ(1405) -> K+ ?+(-) π-(+) -> K+ n π+π-.
It is pointed out that because of a strong interference of the isospin
0 and 1 terms of the ?π scattering amplitudes, the line shape of
Λ(1405) could be different in ?-π+ and ?+π- decay modes.
In order to separate both decay modes, a kinematic fit was applied.
The isospin interference term is cancelled by summing the spectra of
the ?-π+ and ?+π- modes.
The summed spectrum was obtained after correcting for the decay branch
of ?+ -> pπ0.
Our goal is to obtain the cross sections and beam asymmetries of
Λ(1405) and ?0(1385) and line shape of Λ(1405).
The status of analysis will be reported.


--------------------------------------------------------------
Backward phi photo-production from C, and Cu targets
at E_gamma = 1.5-2.4 GeV
Speakers: Takahiro Sawada (RCNP, Osaka University)
--------------------------------------------------------------
Abstract:
We have studied the phi meson photo-production from CH2, C, and Cu
nuclei at backward angle via the phi -> K+ K- decay channel.
The high energy photon beam with E = 1.5-2.4 GeV has been produced by
laser backward Compton scattering from 8 GeV electrons in the storage
ring of SPring-8.
In our earlier publication, we reported the measurement of phi meson
photo-production from Li, C, Al, and Cu targets at forward angle with
LEPS forward spectrometer,
in the phi momentum range of 1.0-2.2 GeV/c (Average 1.8 GeV/c).
In order to investigate low momentum region, we have performed the new
experiment.
A Time Projection Chamber　(TPC)　surrounding the target for enlarging
the detector acceptance was newly installed.
Combined use of this TPC and existing LEPS forward spectrometer
provided drastic increase of the detector acceptance covering the wide
momentum range of phi mesons 0.3-2.0 GeV/c.
It was first measurement of the photo-produced phi
mesons from nuclear targets with momentum less than 0.8 GeV/c.
In this talk, we would like to report the production cross section
ratio from C, Cu nuclei in our momentum region and discuss the
momentum dependence of the in-medium properties of phi meson.

--------------------------------------------------------------
Molecular Interpretation of the XYZ states
Speakers: Raquel Molina (RCNP, Osaka University)
--------------------------------------------------------------
Abstract:
The majority of the 'new’charmonium-like X, Y and Z mesons mainlyu
discovered at the B-factories BELLE and BaBar cannot be easily
accommodated in the qqbar model and are therefore interesting objects
for meson structure
besides the constituent quark model.
They are intriguingly close to the D*D*bar and Ds*Ds*bar thresholds
and there are several theoretical models
which test the hypothesis of D*D*bar ( or Ds*Ds*bar) molecular structure.
One of them is the coupled channel approach, which combined with the
Hidden Gauge Lagrangians, turned out to provide a useful tool to
determine the mass
and width of resonances [1].
In this talk we describe some of the X, Y, Z
states as dynamically generated resonances from the vector - vector
interaction. All the possible channels with quantum numbers charm = 0,
strangeness = 0 around the energy region of 4000 MeV are included. We
find
that some of the XYZ states (the Y(3940), Z(3930) and X(4160)) can fit
into this structure within the model.
A further interesting topic is the radiative decays of these states
which are also a crucial test to hadron structure.
Decay rates are also provided by the model [2] and recently we have
also evaluated the decay ratio of the X(3872) into J/ψγ.

[1] R. Molina and E. Oset, “The Y(3940), Z(3930) and the X(4160) as
dynamically generated resonances from the vector-vector interaction”.
Phys. Rev. D 80, 114013 (2009)

[2] T. Branz, R. Molina and E. Oset, “Radiative decays of the Y(3940), Z
(3930) and the X(4160) as dynamically generated resonances”.
Phys. Rev. D 83, 114015 (2011)

--------------------------------------------------------------------------
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Atsushi Hosaka
To: sg-l__AT__yukawa.kyoto-u.ac.jp
Date: Wed, 25 Jul 2012 21:05:00 +0900
Subject: [sg-l 7309] 再送:　第7回ハドロンスクエアのご案内

みなさま、
下記のハドロンセミナーについて直前のご案内をします。
核物理研究センターにて議論に参加いただきたいのですが、
ご要望がありましたので、KEK MCU　TV会議システムに接続します。
会議番号は281です。接続方法は、
https://kekvcs.kek.jp/iptv/
をご覧ください。
なお、当日の接続に関するトラブルには対応できませんのでその節はご容赦ください。
世話人一同

2012/7/21 Hiroyuki Noumi <noumi__AT__rcnp.osaka-u.ac.jp>
7月26日のセミナーについて再度ご案内します。
奮ってご参加ください。

皆様、

新学術領域研究「多彩なフレーバーで探る新しいハドロン存在形態の包括的研究」（略称「新ハドロン」）では、総括班の取り組みのひとつとして、領域が目指す物理研究に関連するセミナーシリーズ「ハドロン・スクエア」を開催しています。

下記の通り、第７回目を大阪大学核物理研究センターで開催いたします。
次のURLにてもご案内しております。
http://www.rcnp.osaka-u.ac.jp/indico/conferenceDisplay.py?confId=399

皆様ふるってご参加ください。
＃旅費の補助をご希望の方は世話人までご相談ください。＃

「新ハドロン」総括班
飯嶋　徹（名古屋大）、堺井義秀（KEK）、 野海博之（RCNP）、延與秀人（理研）、
保坂　淳（RCNP）、中野貴志（RCNP)、四日市悟（理研）、宮林謙吉（奈良女大）、
原田正康（名古屋大）、中尾幹彦（KEK)

============記===========
第７回「ハドロン・スクエア」
日時：7月26日（木）１３：３０−１６：３０
場所：大阪大学核物理研究センター４階講義室
世話人: 阪大RCNP 野海博之、中野貴志、保坂　淳

13:30 - 14:20:
Photoproduction of Λ(1405) and ?0(1385) on the proton
at Eγ=1.5-3.0GeV at SPring-8/LEPS
Speakers: Yohei Nakatsugawa (RCNP, Osaka University)

14:30 - 15:20:
Backward phi photo-production from C, and Cu targets
at E_gamma = 1.5-2.4 GeV
Speakers: Takahiro Sawada (RCNP, Osaka University)

15:30 - 16:20:
Molecular Interpretation of the XYZ states
Speakers: Raquel Molina (RCNP, Osaka University)

========================================================
講演の詳細
--------------------------------------------------------------
Photoproduction of Λ(1405) and ?0(1385) on the proton
at Eγ=1.5-3.0GeV at SPring-8/LEPS
Speakers: Yohei Nakatsugawa (RCNP, Osaka University)
--------------------------------------------------------------
Abstract:
The Λ(1405) is assigned as a p-wave q3 baryon in a quark model.
However, it is also suggested that Λ(1405) has a non-q3 structure such
as a meson-baryon molecular state.
Some theoretical works using chiral Lagrangian and coupled unitary
model predict the line shape of Λ(1405) as π? and KbarN. Its 2-pole
structure is also suggested.
On the other hand, ?0(1385) is firmly established as
a q3 state baryon.
The difference of the internal structure of Λ(1405) and ?0(1385) may
appear in the photoproduction cross sections and/or photon beam
asymmetries of these two hyperons.
Recently, differential cross sections for γp -> K+Λ(1405) and γp ->
K+?0(1385) reactions were measured by LEPS collaboration. However, the
statistics were limited.
A new experiment was carried out at SPring-8/LEPS with liquid hydrogen
target and linearly polarized photon beam.
In order to detect decay products of hadrons,
a time projection chamber(TPC) surrounding the target was used
together with the LEPS spectrometer.
In order to obtain the spectra of Λ(1405) and ?0(1385) separately, we
extracted following two reactions using track informations of K+
detected by LEPS spectrometer and decay products detected by TPC.
(1) γp -> K+ ?0(1385) -> K+ Λ π0 -> K+ p π- π0,
(2) γp -> K+ Λ(1405) -> K+ ?+(-) π-(+) -> K+ n π+π-.
It is pointed out that because of a strong interference of the isospin
0 and 1 terms of the ?π scattering amplitudes, the line shape of
Λ(1405) could be different in ?-π+ and ?+π- decay modes.
In order to separate both decay modes, a kinematic fit was applied.
The isospin interference term is cancelled by summing the spectra of
the ?-π+ and ?+π- modes.
The summed spectrum was obtained after correcting for the decay branch
of ?+ -> pπ0.
Our goal is to obtain the cross sections and beam asymmetries of
Λ(1405) and ?0(1385) and line shape of Λ(1405).
The status of analysis will be reported.


--------------------------------------------------------------
Backward phi photo-production from C, and Cu targets
at E_gamma = 1.5-2.4 GeV
Speakers: Takahiro Sawada (RCNP, Osaka University)
--------------------------------------------------------------
Abstract:
We have studied the phi meson photo-production from CH2, C, and Cu
nuclei at backward angle via the phi -> K+ K- decay channel.
The high energy photon beam with E = 1.5-2.4 GeV has been produced by
laser backward Compton scattering from 8 GeV electrons in the storage
ring of SPring-8.
In our earlier publication, we reported the measurement of phi meson
photo-production from Li, C, Al, and Cu targets at forward angle with
LEPS forward spectrometer,
in the phi momentum range of 1.0-2.2 GeV/c (Average 1.8 GeV/c).
In order to investigate low momentum region, we have performed the new
experiment.
A Time Projection Chamber　(TPC)　surrounding the target for enlarging
the detector acceptance was newly installed.
Combined use of this TPC and existing LEPS forward spectrometer
provided drastic increase of the detector acceptance covering the wide
momentum range of phi mesons 0.3-2.0 GeV/c.
It was first measurement of the photo-produced phi
mesons from nuclear targets with momentum less than 0.8 GeV/c.
In this talk, we would like to report the production cross section
ratio from C, Cu nuclei in our momentum region and discuss the
momentum dependence of the in-medium properties of phi meson.

--------------------------------------------------------------
Molecular Interpretation of the XYZ states
Speakers: Raquel Molina (RCNP, Osaka University)
--------------------------------------------------------------
Abstract:
The majority of the 'new’charmonium-like X, Y and Z mesons mainlyu
discovered at the B-factories BELLE and BaBar cannot be easily
accommodated in the qqbar model and are therefore interesting objects
for meson structure
besides the constituent quark model.
They are intriguingly close to the D*D*bar and Ds*Ds*bar thresholds
and there are several theoretical models
which test the hypothesis of D*D*bar ( or Ds*Ds*bar) molecular structure.
One of them is the coupled channel approach, which combined with the
Hidden Gauge Lagrangians, turned out to provide a useful tool to
determine the mass
and width of resonances [1].
In this talk we describe some of the X, Y, Z
states as dynamically generated resonances from the vector - vector
interaction. All the possible channels with quantum numbers charm = 0,
strangeness = 0 around the energy region of 4000 MeV are included. We
find
that some of the XYZ states (the Y(3940), Z(3930) and X(4160)) can fit
into this structure within the model.
A further interesting topic is the radiative decays of these states
which are also a crucial test to hadron structure.
Decay rates are also provided by the model [2] and recently we have
also evaluated the decay ratio of the X(3872) into J/ψγ.

[1] R. Molina and E. Oset, “The Y(3940), Z(3930) and the X(4160) as
dynamically generated resonances from the vector-vector interaction”.
Phys. Rev. D 80, 114013 (2009)

[2] T. Branz, R. Molina and E. Oset, “Radiative decays of the Y(3940), Z
(3930) and the X(4160) as dynamically generated resonances”.
Phys. Rev. D 83, 114015 (2011)

--------------------------------------------------------------------------
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Atsushi Hosaka
Date: Tue, 16 Oct 2012 16:29:12 +0900
To: sg-l__AT__yukawa.kyoto-u.ac.jp, ml-np__AT__rcnp.osaka-u.ac.jp
Subject: [sg-l 7452] 第８回「ハドロン・スクエア」のお知らせ

皆様、

科研費・新学術領域研究「多彩なフレーバーで探る新しいハドロン存在形態の包括的研究」
（略称「新ハドロン」）では、総括班の取り組みのひとつとして、領域が目指す物理研究に
関連するセミナーシリーズ「ハドロン・スクエア」を開催しています。

下記の通り、第８回目を奈良女子大学で開催いたします。
次のURLにてもご案内しております。
http://kds.kek.jp/conferenceDisplay.py?confId=11030

皆様ふるってご参加ください。
参加者に外国人が混ざることが確定していますので、講演は英語で行われますが、
ディスカッションは英語・日本語のどちらでもよいことにします。
＃旅費の補助をご希望の方は世話人までご相談ください。＃

「新ハドロン」総括班
飯嶋　徹（名古屋大）、堺井義秀（KEK）、 野海博之（RCNP）、延與秀人（理研）、
保坂淳（RCNP）、中野貴志（RCNP)、四日市悟（理研）、宮林謙吉（奈良女大）、
原田正康（名古屋大）、中尾幹彦（KEK)

============記===========
第８回「ハドロン・スクエア」
日時：１１月１日（木）１３：３０−１６：００
場所：奈良女子大学理学部会議室（A棟1階）
世話人: 奈良女子大学　宮林謙吉

１３：３０ー１４：１０（質疑討論含む）
Radiative decays of X(3872) in the charmonium-molecule hybrid model
講演者：瀧沢誠（昭和薬大）

１４：１０ー１４：５０（質疑応答含む）
Radiative and recent experimental update on X(3872)
講演者：Bhardwaj Vishal（奈良女大）

１４：５０ー１５：１０　休憩

１５：１０ー１５：５０（質疑応答含む）
New Theta+ results from LEPS
講演者：中野貴志（阪大RCNP）

==========================
講演の詳細
--------------------------
Radiative decays of X(3872) in the charmonium-molecule hybrid model
by Makoto Takizawa

We have studied the radiative decays of the X(3872) in the
charmonium-molecule hybrid model.
The decay rate of the X(3872) to J/psi gamma is sensitive to
the amount of the Chi_c1(1P) (^3P_1) charmonium component in
the X(3872).
We have estimated it in the charmonium-molecule hybrid model.
The obtained amount of the Chi_c1(1P) (^3P_1) component in
the X(3872) has been very small, however, we have found that
such small component gives the sizable contribution to the
X(3872) to J/psi gamma decay rate and our result supports
the recent result by Belle.
---------------------------
Radiative and recent experimental update on X(3872)
by Vishal Bhardwaj

Last decade has seen growth in the charmonium (ccbar) sector with
observation of new states, out of which many are the candidates for
exotic states. Among them X(3872) has stirred a lot of discussions due
to its puzzling nature. Its narrow width (Gamma<1.2 MeV) and proximity of
its mass (3871.7+-0.2 MeV) with D*0D0bar threshold makes it a good
candidate for DD*bar resonance. Other models have also been proposed for
X(3872) states, such as tetraquark, admixture of DD*bar and conventional
charmonium and ccbar-g hybrid. Radiative decays provide us a unique
opportunity to understand the nature of X(3872). This talk will cover
the radiative decays of X(3872) along with searches for other X(3872)
decay modes and partner states.
---------------------------
New Theta+ results from LEPS
by Takashi Nakano

New results of the penta-quark Theta+ study in the gamma d -> K+K- p n
reactions from LEPS will be presented.
First, in order to check the validity of the 5-sigma evidence which we
obtained by analyzing the data taken in 2002-2003, the same analysis
method (inclusive analysis where proton and neutron contributions were
not separated) was applied to the new data taken in 2006-2007. A
strong narrow peak in the Fermi-motion corrected K- missing mass was
not reproduced in the new data set.
To investigate the reason for the inconsistency, we applied an
exclusive analysis to the both data sets, where background processes
due to gamma p reactions were identified by energy loss information
in a trigger plastic counter which was placed just after the
liquid-deuterium target. A clear signal enhancement was seen in the
gamma n contributions of the both data sets, and a part of the
inconsistency was tuned out to be due to fluctuations in the proton
contribution of the previous data set. The signal enhancement was also
confirmed by a Monte-Carlo based exclusive analysis.
This talk will be given in English.
---------------------------
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Atsushi Hosaka
Date: Fri, 1 Feb 2013 21:40:18 +0900
To: sg-l__AT__yukawa.kyoto-u.ac.jp
Subject: [sg-l 7716] 第9回「ハドロン・スクエア」のお知らせ

みなさま

科研費・新学術領域研究「多彩なフレーバーで探る新しいハドロン存在形態の
包括的研究」（略称「新ハドロン」）では、総括班の取り組みのひとつとして、
領域が目指す物理研究に関連するセミナーシリーズ「ハドロン・スクエア」を
開催しています。

第9回目は 2/25に 理化学研究所で開催いたします。
最近の INFNでの Kaonic hydrogen 実験の成果について、
実験: 岡田 信二 氏 (理研)
理論: 兵藤 哲雄 氏 (東工大)
の お二方をお招きして お話しいただきます。
皆様ふるってご参加ください。

些少ですが旅費の用意もありますので
補助をご希望の方は世話人(yokkaich__AT__riken.jp)までご相談ください。

「新ハドロン」総括班
 飯嶋　徹（名古屋大）、堺井義秀（KEK）、 野海博之（RCNP）、
 延與秀人（理研）、保坂淳（RCNP）、中野貴志（RCNP)、四日市悟（理研）、
 宮林謙吉（奈良女大）、原田正康（名古屋大）、中尾幹彦（KEK)


============記===============
第9回「ハドロン・スクエア」

日時    ：2013年2月25日(月) 13:30-15:45
場所    ：理化学研究所  和光キャンパス 仁科ホール
http://www.riken.jp/r-world/riken/campus/wako/index.html
 (構内地図13番)
世話人  : 理研仁科センター  四日市 悟, 青木 和也

13:30-14:30 「DAFNE加速器におけるK中間子水素原子X線精密分光実験」
            理研仁科センター 岡田 信二

14:30-14:45 休憩

14:45-15:45 「Kbar N相互作用と Lambda(1405)」
            東京工業大学 兵藤 哲雄

(講演は日本語です。講演時間は議論の時間を含みます。)

以下、講演概要です。
------------------------------------------------
「DAFNE加速器におけるK中間子水素原子X線精密分光実験」

最近、K^-中間子と陽子のクーロン力による束縛系「K中間子水素原子」の
X線精密分光実験(SIDDHARTA)により、1s軌道におけるK^-と陽子間の強い相互
作用によるレベルシフトと幅を世界最高精度で決定した (Physics Letters B
704 (2011) 113)。実験は、イタリア国立フラスカティ研究所における電子・
陽電子衝突型加速器DAFNEにて行った。同原子のX線収量は、シュタルク効果に
より標的密度が高くなるにつれ減少する為、低密度ガス標的を用いることが
本質的である。しかしながら、従来のハドロンビームラインでは、K-を効率的
にガス標的に静止させるのは難しかった。DAFNE加速器は、e^+ e^-衝突により
Φ中間子を大量生成し、Φ->K^+ K^-二体崩壊から運動量の揃った低エネルギー
K中間子を供給する為、ガス標的にK^-を効率よく静止させ、K中間子原子を
生成する実験には最適な施設である。X線検出には、本実験の為にヨーロッパ
研究プロジェクトにおいて開発された大面積(1 cm^2 / 1台)・高分解能
(ΔE ~ 170 eV __AT__ 6 keV、Δt < 1 usec)のシリコンドリフト検出器 (SDD) を
用いた。X線分光を目的とし100台を超すSDDを加速器実験にて用いたのは本実験
が初である。本測定により，従来問題であったK^-p散乱データとの矛盾が解決
され、ストレンジネス系のハドロン間相互作用に対する定量的な制限は飛躍的に
向上した。本セミナーでは、実験概要とその結果に加え、将来展望についても
紹介する。
------------------------------------------------
「Kbar N相互作用と Lambda(1405)」

Kbar N 相互作用は閾値下に Lambda(1405) 共鳴が存在することから強い
引力であり、K 中間子原子核を構成する基本相互作用と考えられている。
また、近年様々な生成反応によって pi Sigma 質量分布スペクトルが観測
されており、Lambda(1405) の構造をはじめ、近傍の Sigma* 共鳴を含めた
S=-1 メソンバリオン散乱の包括的な理解が求められている。本講演では
SIDDHARTAによるK 中間子水素精密測定のデータを用いた現実的 Kbar N 相互
作用の構築と、Lambda(1405) 共鳴の構造、KNシグマ項について議論する。
------------------------------------------------
以上