From 16904e11c92692213f347d35642ea3377443147b Mon Sep 17 00:00:00 2001
From: Remco de Boer <29308176+redeboer@users.noreply.github.com>
Date: Mon, 29 Apr 2024 09:33:38 +0200
Subject: [PATCH 1/2] MAINT: switch to multiline string in test

---
 tests/test_io.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tests/test_io.py b/tests/test_io.py
index b5a883ba..0ff7cbaf 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -42,10 +42,10 @@ def test_aslatex_isobar_node():
     latex = aslatex(node)
     assert latex == R"\Lambda(1520) \to p K^-"
     latex = aslatex(node, with_jp=True)
-    assert (
-        latex == R"\Lambda(1520)\left[\frac{3}{2}^-\right] \to"
-        R" p\left[\frac{1}{2}^+\right] K^-\left[0^-\right]"
-    )
+    expected = R"""
+    \Lambda(1520)\left[\frac{3}{2}^-\right] \to p\left[\frac{1}{2}^+\right] K^-\left[0^-\right]
+    """.strip()
+    assert latex == expected
 
     node = IsobarNode(Λ1520, p, K, interaction=(2, 1))
     latex = aslatex(node)

From 3f7b028eeaf8e0849418f9f357ed7d0b2772fa19 Mon Sep 17 00:00:00 2001
From: Remco de Boer <29308176+redeboer@users.noreply.github.com>
Date: Sat, 27 Apr 2024 22:05:48 +0200
Subject: [PATCH 2/2] ENH: group decay node in decay LaTeX rendering

---
 src/ampform_dpd/io.py | 5 ++++-
 tests/test_io.py      | 6 +++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/ampform_dpd/io.py b/src/ampform_dpd/io.py
index 65149f3c..b87252d9 100644
--- a/src/ampform_dpd/io.py
+++ b/src/ampform_dpd/io.py
@@ -108,7 +108,10 @@ def render_arrow(node: IsobarNode) -> str:
     to = render_arrow(obj)
     child1 = aslatex(obj.child1, **kwargs)
     child2 = aslatex(obj.child2, **kwargs)
-    return Rf"{parent} {to} {child1} {child2}"
+    latex = Rf"{parent} {to} {child1} {child2}"
+    if isinstance(obj.parent, State):
+        return latex
+    return Rf"\left({latex}\right)"
 
 
 @aslatex.register(ThreeBodyDecay)
diff --git a/tests/test_io.py b/tests/test_io.py
index 0ff7cbaf..ea4081af 100644
--- a/tests/test_io.py
+++ b/tests/test_io.py
@@ -40,16 +40,16 @@ def test_aslatex_particle():
 def test_aslatex_isobar_node():
     node = IsobarNode(Λ1520, p, K)
     latex = aslatex(node)
-    assert latex == R"\Lambda(1520) \to p K^-"
+    assert latex == R"\left(\Lambda(1520) \to p K^-\right)"
     latex = aslatex(node, with_jp=True)
     expected = R"""
-    \Lambda(1520)\left[\frac{3}{2}^-\right] \to p\left[\frac{1}{2}^+\right] K^-\left[0^-\right]
+    \left(\Lambda(1520)\left[\frac{3}{2}^-\right] \to p\left[\frac{1}{2}^+\right] K^-\left[0^-\right]\right)
     """.strip()
     assert latex == expected
 
     node = IsobarNode(Λ1520, p, K, interaction=(2, 1))
     latex = aslatex(node)
-    assert latex == R"\Lambda(1520) \xrightarrow[S=1]{L=2} p K^-"
+    assert latex == R"\left(\Lambda(1520) \xrightarrow[S=1]{L=2} p K^-\right)"
 
 
 @pytest.mark.parametrize(